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81. 'Breakdown maintenance' (as distinct from preventive maintenance) refers to:
- A. Maintenance performed exclusively by contractors, never railway staff
- B. Maintenance carried out strictly before any fault develops
- C. A type of maintenance done only on brand-new locomotives
- D. Repair work carried out after a failure has already occurred
Answer: Repair work carried out after a failure has already occurred
Explanation: Repair work carried out after a failure has already occurred — verified fact for Railway Mechanical Engineering Group B LDCE.
82. 'Preventive maintenance', as a general workshop philosophy, means:
- A. Carrying out scheduled inspection and servicing at defined intervals to catch and fix problems before they cause failure
- B. Replacing every component daily regardless of condition
- C. Repairing equipment only after it has completely failed
- D. Avoiding all maintenance to save cost
Answer: Carrying out scheduled inspection and servicing at defined intervals to catch and fix problems before they cause failure
Explanation: Carrying out scheduled inspection and servicing at defined intervals to catch and fix problems before they cause failure — verified fact for Railway Mechanical Engineering Group B LDCE.
83. A 'drop pit' in a loco shed/workshop is primarily used to:
- A. Wash the exterior of coaches
- B. Store diesel fuel underground
- C. Allow removal and replacement of wheelsets from beneath a locomotive/coach without fully lifting or dismantling the vehicle
- D. House the workshop's administrative offices
Answer: Allow removal and replacement of wheelsets from beneath a locomotive/coach without fully lifting or dismantling the vehicle
Explanation: Allow removal and replacement of wheelsets from beneath a locomotive/coach without fully lifting or dismantling the vehicle — verified fact for Railway Mechanical Engineering Group B LDCE.
84. A 'wheel lathe' in a railway workshop is used for:
- A. Painting the exterior of coaches
- B. Testing the tensile strength of overhead wires
- C. Cutting rail track into shorter sections
- D. Re-profiling/machining worn wheel treads and flanges back to the correct dimensions
Answer: Re-profiling/machining worn wheel treads and flanges back to the correct dimensions
Explanation: Re-profiling/machining worn wheel treads and flanges back to the correct dimensions — verified fact for Railway Mechanical Engineering Group B LDCE.
85. Overhead cranes used in C&W workshops for lifting coach/wagon bodies must be periodically inspected mainly to:
- A. Confirm the locomotive's fuel efficiency
- B. Verify passenger ticket sales figures
- C. Check the workshop's electricity billing only
- D. Ensure their lifting mechanism, cables/chains and brakes are safe and free from defects, preventing load-drop accidents
Answer: Ensure their lifting mechanism, cables/chains and brakes are safe and free from defects, preventing load-drop accidents
Explanation: Ensure their lifting mechanism, cables/chains and brakes are safe and free from defects, preventing load-drop accidents — verified fact for Railway Mechanical Engineering Group B LDCE.
86. Use of Personal Protective Equipment (PPE) such as safety goggles, gloves, and helmets in a railway workshop is important mainly to:
- A. Improve the appearance of the workshop for visitors only
- B. Increase the speed of production with no safety purpose
- C. Protect workers from injury during welding, grinding, lifting and other hazardous workshop operations
- D. Replace the need for any other safety procedure
Answer: Protect workers from injury during welding, grinding, lifting and other hazardous workshop operations
Explanation: Protect workers from injury during welding, grinding, lifting and other hazardous workshop operations — verified fact for Railway Mechanical Engineering Group B LDCE.
87. Workshop safety practice generally requires that before maintenance work begins on a vehicle in a pit line, the vehicle should be:
- A. Kept running at full power throughout the work
- B. Properly secured against movement, and where applicable isolated from power supply, with appropriate warning signage/protection displayed
- C. Disconnected from all safety documentation
- D. Left completely unattended with no precautions
Answer: Properly secured against movement, and where applicable isolated from power supply, with appropriate warning signage/protection displayed
Explanation: Properly secured against movement, and where applicable isolated from power supply, with appropriate warning signage/protection displayed — verified fact for Railway Mechanical Engineering Group B LDCE.
88. The general purpose of maintaining a 'history sheet'/maintenance record for each locomotive or coach is to:
- A. Determine passenger ticket pricing
- B. Track its maintenance history, defects, and overhauls to support informed future maintenance decisions
- C. Replace the need for any physical inspection
- D. Record only the names of past drivers with no technical data
Answer: Track its maintenance history, defects, and overhauls to support informed future maintenance decisions
Explanation: Track its maintenance history, defects, and overhauls to support informed future maintenance decisions — verified fact for Railway Mechanical Engineering Group B LDCE.
89. 'Quality control' in a railway workshop typically involves:
- A. Allowing all repaired components to be used without any inspection
- B. Testing only new locomotives, never overhauled ones
- C. Only checking the appearance/paint of finished stock
- D. Inspecting and testing components/assemblies against defined standards before they are certified fit for service
Answer: Inspecting and testing components/assemblies against defined standards before they are certified fit for service
Explanation: Inspecting and testing components/assemblies against defined standards before they are certified fit for service — verified fact for Railway Mechanical Engineering Group B LDCE.
90. A 'Carriage & Wagon (C&W) Workshop' differs from a 'Loco Shed' primarily in that the workshop:
- A. Only handles ticket sales while the shed handles maintenance
- B. Has no mechanical staff at all
- C. Exclusively maintains signalling equipment
- D. Focuses on periodic overhaul and heavier repair of coaches/wagons, while a loco shed focuses on locomotive stabling and running maintenance
Answer: Focuses on periodic overhaul and heavier repair of coaches/wagons, while a loco shed focuses on locomotive stabling and running maintenance
Explanation: Focuses on periodic overhaul and heavier repair of coaches/wagons, while a loco shed focuses on locomotive stabling and running maintenance — verified fact for Railway Mechanical Engineering Group B LDCE.
91. A 'Diesel Shed' is primarily responsible for:
- A. Manufacturing brand-new coaches from scratch
- B. Handling passenger ticket booking
- C. Stabling, fuelling, and scheduled maintenance/inspection of diesel locomotives
- D. Maintaining only electric multiple units (EMUs)
Answer: Stabling, fuelling, and scheduled maintenance/inspection of diesel locomotives
Explanation: Stabling, fuelling, and scheduled maintenance/inspection of diesel locomotives — verified fact for Railway Mechanical Engineering Group B LDCE.
92. On Indian Railways, the Mechanical Department is broadly responsible for:
- A. Track (permanent way) construction and maintenance exclusively
- B. Locomotives, coaches, wagons and their maintenance, along with associated workshops
- C. Ticketing and passenger reservation exclusively
- D. Signalling and telecommunication systems exclusively
Answer: Locomotives, coaches, wagons and their maintenance, along with associated workshops
Explanation: Locomotives, coaches, wagons and their maintenance, along with associated workshops — verified fact for Railway Mechanical Engineering Group B LDCE.
93. Composite brake blocks (using non-metallic friction material) have been increasingly adopted on Indian Railways rolling stock partly because they:
- A. Cannot be used with air brake systems at all
- B. Completely eliminate the need for any braking system
- C. Work only at very low speeds below 10 km/h
- D. Generally offer longer life and reduced wheel wear compared to older cast-iron brake blocks
Answer: Generally offer longer life and reduced wheel wear compared to older cast-iron brake blocks
Explanation: Generally offer longer life and reduced wheel wear compared to older cast-iron brake blocks — verified fact for Railway Mechanical Engineering Group B LDCE.
94. A 'brake block/brake shoe' on rolling stock is the component that:
- A. Generates compressed air for the entire train
- B. Presses against the wheel tread (or disc) to create the friction needed to slow or stop the vehicle
- C. Supplies electrical power to the coach lighting
- D. Couples one wagon to the next
Answer: Presses against the wheel tread (or disc) to create the friction needed to slow or stop the vehicle
Explanation: Presses against the wheel tread (or disc) to create the friction needed to slow or stop the vehicle — verified fact for Railway Mechanical Engineering Group B LDCE.
95. A key mechanical maintenance reason bio-toilets require periodic inspection is:
- A. To verify the locomotive's fuel level
- B. To ensure the tank, valves and discharge mechanism are functioning correctly and not blocked or leaking
- C. To check the coach's air-conditioning temperature
- D. To repaint the toilet's exterior colour scheme
Answer: To ensure the tank, valves and discharge mechanism are functioning correctly and not blocked or leaking
Explanation: To ensure the tank, valves and discharge mechanism are functioning correctly and not blocked or leaking — verified fact for Railway Mechanical Engineering Group B LDCE.
96. A coach's 'toilet/bio-toilet system', as increasingly fitted on Indian Railways coaches, is designed primarily to:
- A. Store waste permanently on the coach with no treatment or discharge
- B. Treat human waste on board (using bacterial action) before discharge, reducing track fouling compared to older direct-discharge toilets
- C. Generate electricity for the coach lighting system
- D. Convert waste directly into drinking water on board
Answer: Treat human waste on board (using bacterial action) before discharge, reducing track fouling compared to older direct-discharge toilets
Explanation: Treat human waste on board (using bacterial action) before discharge, reducing track fouling compared to older direct-discharge toilets — verified fact for Railway Mechanical Engineering Group B LDCE.
97. General workshop practice for coach/wagon POH requires that after reassembly, the vehicle is subjected to:
- A. Testing only of the exterior paint finish
- B. No testing at all, as POH guarantees correctness automatically
- C. Testing only by the passengers after boarding
- D. Functional testing (such as brake testing) before being released back into service
Answer: Functional testing (such as brake testing) before being released back into service
Explanation: Functional testing (such as brake testing) before being released back into service — verified fact for Railway Mechanical Engineering Group B LDCE.
98. 'Pneumatic door' systems on modern EMU/MEMU or LHB-based coaches are operated using:
- A. Compressed air, controlled electrically/pneumatically for opening and closing
- B. Diesel fuel combustion directly at the door
- C. Manual hand-cranking exclusively with no powered assistance
- D. Overhead catenary wire tension
Answer: Compressed air, controlled electrically/pneumatically for opening and closing
Explanation: Compressed air, controlled electrically/pneumatically for opening and closing — verified fact for Railway Mechanical Engineering Group B LDCE.
99. A benefit generally associated with Head-on-Generation (HOG) power supply for coaches (as opposed to coach-mounted diesel generator cars) is:
- A. Removing the need for any coach lighting
- B. Reduced fuel consumption/noise and lower maintenance compared to running separate generator cars
- C. Doubling the train's maximum speed automatically
- D. Complete elimination of the need for any electricity on the train
Answer: Reduced fuel consumption/noise and lower maintenance compared to running separate generator cars
Explanation: Reduced fuel consumption/noise and lower maintenance compared to running separate generator cars — verified fact for Railway Mechanical Engineering Group B LDCE.
100. 'End-on-Generation (EOG)'/'Head-on-Generation (HOG)' systems, used increasingly on Indian Railways trains, refer to:
- A. A braking system used only on freight wagons
- B. A signalling protocol used only at stations
- C. Supplying electrical power to the entire coach rake directly from the locomotive (or a dedicated generator car), rather than from individual coach-axle-driven alternators
- D. A fuel injection system used in diesel locomotives
Answer: Supplying electrical power to the entire coach rake directly from the locomotive (or a dedicated generator car), rather than from individual coach-axle-driven alternators
Explanation: Supplying electrical power to the entire coach rake directly from the locomotive (or a dedicated generator car), rather than from individual coach-axle-driven alternators — verified fact for Railway Mechanical Engineering Group B LDCE.
101. A coach's 'battery and lighting/fan electrical system' is generally charged and maintained via:
- A. Direct fuel combustion inside the coach
- B. A separate diesel engine mounted inside every coach
- C. Manual hand-cranking by passengers only
- D. An alternator/dynamo driven off the coach axle (or an end-on-generation/head-on-generation supply from the locomotive), depending on the system used
Answer: An alternator/dynamo driven off the coach axle (or an end-on-generation/head-on-generation supply from the locomotive), depending on the system used
Explanation: An alternator/dynamo driven off the coach axle (or an end-on-generation/head-on-generation supply from the locomotive), depending on the system used — verified fact for Railway Mechanical Engineering Group B LDCE.
102. Which of the following best describes the general function of a coach's 'water tank and plumbing system' from a mechanical maintenance standpoint?
- A. Supplying water for onboard toilets/washbasins, requiring periodic cleaning, leak checks and refilling arrangements
- B. Cooling the locomotive's diesel engine
- C. Supplying compressed air for the braking system exclusively
- D. Generating electrical power for coach lighting
Answer: Supplying water for onboard toilets/washbasins, requiring periodic cleaning, leak checks and refilling arrangements
Explanation: Supplying water for onboard toilets/washbasins, requiring periodic cleaning, leak checks and refilling arrangements — verified fact for Railway Mechanical Engineering Group B LDCE.
103. 'Interchangeability' of standard wagon components (such as bearings or brake gear) across the Indian Railways fleet is important mainly because it:
- A. Eliminates the need for periodic maintenance entirely
- B. Allows wagons to be converted into locomotives when needed
- C. Simplifies maintenance, spares management, and repairs across a large, geographically dispersed fleet
- D. Increases the wagon's carrying capacity automatically
Answer: Simplifies maintenance, spares management, and repairs across a large, geographically dispersed fleet
Explanation: Simplifies maintenance, spares management, and repairs across a large, geographically dispersed fleet — verified fact for Railway Mechanical Engineering Group B LDCE.
104. A 'container flat wagon' used for containerised freight traffic is designed primarily to:
- A. Carry only passengers in reserved compartments
- B. Carry livestock exclusively
- C. Carry only bulk liquid cargo in a sealed tank
- D. Securely carry standard shipping containers on a flat deck with container-locking fittings
Answer: Securely carry standard shipping containers on a flat deck with container-locking fittings
Explanation: Securely carry standard shipping containers on a flat deck with container-locking fittings — verified fact for Railway Mechanical Engineering Group B LDCE.
105. 'Fouling mark'/'infringement' checks relevant to rolling stock dimensions ensure that a wagon or coach:
- A. Stays within the permitted moving/structure gauge so it does not strike adjacent structures or trains on parallel tracks
- B. Has the correct passenger seating capacity only
- C. Uses the correct type of fuel
- D. Has the correct engine horsepower rating
Answer: Stays within the permitted moving/structure gauge so it does not strike adjacent structures or trains on parallel tracks
Explanation: Stays within the permitted moving/structure gauge so it does not strike adjacent structures or trains on parallel tracks — verified fact for Railway Mechanical Engineering Group B LDCE.
106. 'Anti-telescoping' design features in coaches (notably emphasised in LHB coaches) are intended to:
- A. Reduce the coach's overall weight for fuel savings
- B. Increase the coach's maximum permissible speed with no safety purpose
- C. Improve the coach's air-conditioning efficiency
- D. Prevent one coach from riding over/into another in a collision, reducing casualties
Answer: Prevent one coach from riding over/into another in a collision, reducing casualties
Explanation: Prevent one coach from riding over/into another in a collision, reducing casualties — verified fact for Railway Mechanical Engineering Group B LDCE.
107. An advantage of disc brakes over conventional tread (wheel-mounted) brake blocks is generally that disc brakes:
- A. Work only when the train is stationary
- B. Reduce wear on the wheel tread itself and can provide more consistent braking performance
- C. Require no maintenance ever after fitment
- D. Eliminate the need for compressed air entirely in all cases
Answer: Reduce wear on the wheel tread itself and can provide more consistent braking performance
Explanation: Reduce wear on the wheel tread itself and can provide more consistent braking performance — verified fact for Railway Mechanical Engineering Group B LDCE.
108. 'Disc brakes', used on many modern coaches (including LHB design), operate by:
- A. Applying a magnetic field to the rail directly with no wheel/axle contact
- B. Using only a vacuum-based mechanism with no friction elements
- C. Using compressed air to directly propel the coach backward
- D. Applying brake pads against a disc mounted on the axle/wheel to create friction and slow the vehicle
Answer: Applying brake pads against a disc mounted on the axle/wheel to create friction and slow the vehicle
Explanation: Applying brake pads against a disc mounted on the axle/wheel to create friction and slow the vehicle — verified fact for Railway Mechanical Engineering Group B LDCE.
109. 'Air-spring suspension', used on LHB coach bogies, generally provides which benefit over traditional coil-spring suspension?
- A. No difference in ride quality whatsoever
- B. Significantly higher fuel consumption for the locomotive
- C. Complete elimination of the need for any bogie
- D. A smoother, more comfortable ride with better vibration damping, especially at higher speeds
Answer: A smoother, more comfortable ride with better vibration damping, especially at higher speeds
Explanation: A smoother, more comfortable ride with better vibration damping, especially at higher speeds — verified fact for Railway Mechanical Engineering Group B LDCE.
110. On a passenger coach, the 'underframe' refers to:
- A. The coach's air-conditioning duct system only
- B. The main structural steel frame beneath the coach body that supports the body shell, bogies and equipment
- C. The coach's overhead luggage rack
- D. The coach's interior seating upholstery
Answer: The main structural steel frame beneath the coach body that supports the body shell, bogies and equipment
Explanation: The main structural steel frame beneath the coach body that supports the body shell, bogies and equipment — verified fact for Railway Mechanical Engineering Group B LDCE.
111. The main reason both buffers (for compressive forces) and draft gear (for tensile forces) are needed on conventional coupled stock is:
- A. To allow the train to run without any locomotive
- B. To increase the overall length of the train artificially
- C. Because Indian Railways requires two separate braking systems
- D. A train experiences both pushing and pulling forces during acceleration, braking, and shunting, and each type of force needs to be cushioned appropriately
Answer: A train experiences both pushing and pulling forces during acceleration, braking, and shunting, and each type of force needs to be cushioned appropriately
Explanation: A train experiences both pushing and pulling forces during acceleration, braking, and shunting, and each type of force needs to be cushioned appropriately — verified fact for Railway Mechanical Engineering Group B LDCE.
112. A 'draft gear'/'draw gear' assembly, used with couplers on rolling stock, functions to:
- A. Generate compressed air for the brake system
- B. Absorb and cushion pulling (tensile/draft) forces transmitted through the coupling during starting, running and braking
- C. Provide lighting inside the coach
- D. Measure the wagon's exact cargo weight
Answer: Absorb and cushion pulling (tensile/draft) forces transmitted through the coupling during starting, running and braking
Explanation: Absorb and cushion pulling (tensile/draft) forces transmitted through the coupling during starting, running and braking — verified fact for Railway Mechanical Engineering Group B LDCE.
113. 'Buffers' fitted at the ends of coaches and wagons primarily serve to:
- A. Generate the electrical supply for coach lighting
- B. Measure the train's speed
- C. Provide the primary braking force for the train
- D. Absorb and cushion compressive (buffing) shocks between vehicles during coupling, shunting and running
Answer: Absorb and cushion compressive (buffing) shocks between vehicles during coupling, shunting and running
Explanation: Absorb and cushion compressive (buffing) shocks between vehicles during coupling, shunting and running — verified fact for Railway Mechanical Engineering Group B LDCE.
114. Anti-corrosive measures such as painting/coating and periodic inspection are applied to wagon underframes mainly to:
- A. Increase the wagon's carrying capacity
- B. Reduce the wagon's overall weight to zero
- C. Eliminate the need for any future inspection
- D. Slow down rust/corrosion and extend the safe service life of the structure
Answer: Slow down rust/corrosion and extend the safe service life of the structure
Explanation: Slow down rust/corrosion and extend the safe service life of the structure — verified fact for Railway Mechanical Engineering Group B LDCE.
115. 'Corrosion' is a significant maintenance concern for railway wagon underframes and bodies mainly because it:
- A. Has no effect whatsoever on structural integrity
- B. Only affects the paint colour, with no strength implications
- C. Improves the strength of steel components over time
- D. Progressively weakens the steel structure over time, potentially compromising structural strength and safety if unaddressed
Answer: Progressively weakens the steel structure over time, potentially compromising structural strength and safety if unaddressed
Explanation: Progressively weakens the steel structure over time, potentially compromising structural strength and safety if unaddressed — verified fact for Railway Mechanical Engineering Group B LDCE.
116. 'Carrying capacity' (or payload) of a wagon refers to:
- A. The maximum weight of goods/cargo the wagon is designed and permitted to carry
- B. The wagon's own empty weight
- C. The wagon's overall length in metres only
- D. The total number of wheels fitted on the wagon
Answer: The maximum weight of goods/cargo the wagon is designed and permitted to carry
Explanation: The maximum weight of goods/cargo the wagon is designed and permitted to carry — verified fact for Railway Mechanical Engineering Group B LDCE.
117. 'Tare weight' of a wagon refers to:
- A. The weight of only the wagon's braking system
- B. The total weight including the heaviest possible load
- C. The empty (unladen) weight of the wagon itself, excluding any cargo
- D. The maximum permissible speed of the wagon
Answer: The empty (unladen) weight of the wagon itself, excluding any cargo
Explanation: The empty (unladen) weight of the wagon itself, excluding any cargo — verified fact for Railway Mechanical Engineering Group B LDCE.
118. The general purpose of periodic 'wheel profile measurement/reprofiling' on coaches and wagons is to:
- A. Maintain the correct wheel tread and flange shape needed for safe rail contact and to prevent derailment risk
- B. Increase the wagon's carrying capacity permanently
- C. Change the wagon's gauge from Broad Gauge to Metre Gauge
- D. Reduce the number of axles on the wagon
Answer: Maintain the correct wheel tread and flange shape needed for safe rail contact and to prevent derailment risk
Explanation: Maintain the correct wheel tread and flange shape needed for safe rail contact and to prevent derailment risk — verified fact for Railway Mechanical Engineering Group B LDCE.
119. 'Hot axle box detectors' installed at certain locations along the track serve the purpose of:
- A. Counting the number of passengers on board
- B. Measuring the exact speed of the train only
- C. Detecting abnormally hot axle bearings on passing trains to help prevent failures/derailments
- D. Detecting overhead wire faults exclusively
Answer: Detecting abnormally hot axle bearings on passing trains to help prevent failures/derailments
Explanation: Detecting abnormally hot axle bearings on passing trains to help prevent failures/derailments — verified fact for Railway Mechanical Engineering Group B LDCE.
120. A 'hot axle' or 'hot box' condition in railway rolling stock refers to:
- A. A deliberately heated axle used for cold-weather operation
- B. Excessive overheating of an axle bearing, usually due to inadequate lubrication or bearing failure, which can lead to axle failure if undetected
- C. A normal, harmless operating temperature range for all axles
- D. A type of coach heating system for passenger comfort
Answer: Excessive overheating of an axle bearing, usually due to inadequate lubrication or bearing failure, which can lead to axle failure if undetected
Explanation: Excessive overheating of an axle bearing, usually due to inadequate lubrication or bearing failure, which can lead to axle failure if undetected — verified fact for Railway Mechanical Engineering Group B LDCE.
121. Adequate and timely 'lubrication' of wagon/coach axle bearings is important mainly to:
- A. Reduce friction and heat generation, preventing 'hot axle' failures and bearing seizure
- B. Increase the electrical resistance of the axle
- C. Reduce the wagon's total tare weight
- D. Improve the coach's exterior paint finish
Answer: Reduce friction and heat generation, preventing 'hot axle' failures and bearing seizure
Explanation: Reduce friction and heat generation, preventing 'hot axle' failures and bearing seizure — verified fact for Railway Mechanical Engineering Group B LDCE.
122. 'Roller bearings' used on modern railway wagon/coach axles, compared to older plain (journal) bearings, generally offer:
- A. Lower friction, reduced maintenance needs, and better performance especially at higher speeds
- B. No difference at all in friction or maintenance
- C. Complete elimination of the need for any bearing lubrication whatsoever
- D. Higher friction and more frequent lubrication requirements than plain bearings
Answer: Lower friction, reduced maintenance needs, and better performance especially at higher speeds
Explanation: Lower friction, reduced maintenance needs, and better performance especially at higher speeds — verified fact for Railway Mechanical Engineering Group B LDCE.
123. A 'Carriage & Wagon (C&W) workshop' on Indian Railways primarily handles:
- A. Only the maintenance of diesel and electric locomotives
- B. Only signalling and telecom equipment
- C. Periodic overhaul, repair, and maintenance of coaches and wagons
- D. Only track/permanent-way maintenance
Answer: Periodic overhaul, repair, and maintenance of coaches and wagons
Explanation: Periodic overhaul, repair, and maintenance of coaches and wagons — verified fact for Railway Mechanical Engineering Group B LDCE.
124. Periodical Overhaul (POH) of a coach/wagon generally involves:
- A. Painting the exterior only, with no mechanical checks
- B. Replacing the coach with an entirely new one every time
- C. A comprehensive scheduled overhaul including detailed inspection, repair, and reconditioning of the underframe, bogies, brake gear, and body
- D. Only a quick visual check with no dismantling at all
Answer: A comprehensive scheduled overhaul including detailed inspection, repair, and reconditioning of the underframe, bogies, brake gear, and body
Explanation: A comprehensive scheduled overhaul including detailed inspection, repair, and reconditioning of the underframe, bogies, brake gear, and body — verified fact for Railway Mechanical Engineering Group B LDCE.
125. Non-destructive testing (NDT) methods such as ultrasonic or magnetic particle testing are used on railway axles/wheels primarily to:
- A. Measure the wagon's total cargo weight
- B. Detect internal or surface cracks/flaws without damaging or destroying the component being tested
- C. Test the locomotive's fuel quality
- D. Repaint the axle surface for cosmetic purposes
Answer: Detect internal or surface cracks/flaws without damaging or destroying the component being tested
Explanation: Detect internal or surface cracks/flaws without damaging or destroying the component being tested — verified fact for Railway Mechanical Engineering Group B LDCE.
126. An 'axle' on a railway wagon/coach must be periodically inspected (including for surface cracks) mainly because it:
- A. Is replaced every single day regardless of condition, making inspection unnecessary
- B. Has no load-bearing function and is inspected only for appearance
- C. Carries the full load of the vehicle and undergoes repeated cyclic stress, making fatigue failure a serious safety risk if undetected
- D. Never experiences any stress during normal operation
Answer: Carries the full load of the vehicle and undergoes repeated cyclic stress, making fatigue failure a serious safety risk if undetected
Explanation: Carries the full load of the vehicle and undergoes repeated cyclic stress, making fatigue failure a serious safety risk if undetected — verified fact for Railway Mechanical Engineering Group B LDCE.
127. 'Wheel and axle' maintenance on coaches/wagons routinely includes checking for which of the following?
- A. Overhead wire tension only
- B. Passenger seat upholstery colour only
- C. Signal aspect visibility from the driver's cab
- D. Wear on the wheel tread/flange profile, cracks, and correct wheel gauge/alignment
Answer: Wear on the wheel tread/flange profile, cracks, and correct wheel gauge/alignment
Explanation: Wear on the wheel tread/flange profile, cracks, and correct wheel gauge/alignment — verified fact for Railway Mechanical Engineering Group B LDCE.
128. A key advantage of 'CBC' (centre buffer couplers), increasingly used on Indian Railways rolling stock, over traditional screw couplings is:
- A. It works only on narrow gauge stock and cannot be used on Broad Gauge
- B. It eliminates the need for any buffer function entirely
- C. It requires no maintenance ever after installation
- D. Greater strength and easier, safer coupling/uncoupling, particularly suited to heavier and longer trains
Answer: Greater strength and easier, safer coupling/uncoupling, particularly suited to heavier and longer trains
Explanation: Greater strength and easier, safer coupling/uncoupling, particularly suited to heavier and longer trains — verified fact for Railway Mechanical Engineering Group B LDCE.
129. 'Screw coupling', a traditional coupling system used on Indian Railways coaching stock, connects vehicles primarily using:
- A. Compressed air alone with no mechanical connection
- B. A fully automatic electronic locking mechanism with no manual components
- C. A screw-adjustable link/hook mechanism combined with side buffers to control slack and transmit pulling/buffing forces
- D. Magnetic coupling with no mechanical link
Answer: A screw-adjustable link/hook mechanism combined with side buffers to control slack and transmit pulling/buffing forces
Explanation: A screw-adjustable link/hook mechanism combined with side buffers to control slack and transmit pulling/buffing forces — verified fact for Railway Mechanical Engineering Group B LDCE.
130. A 'brake van'/'guard's van', historically used at the rear of goods trains, mainly served the purpose of:
- A. Providing accommodation for the guard and a means of applying emergency/hand brakes from the rear of the train
- B. Carrying the maximum number of passengers on a goods train
- C. Storing the locomotive's spare fuel exclusively
- D. Housing the train's electrical control panel only
Answer: Providing accommodation for the guard and a means of applying emergency/hand brakes from the rear of the train
Explanation: Providing accommodation for the guard and a means of applying emergency/hand brakes from the rear of the train — verified fact for Railway Mechanical Engineering Group B LDCE.
131. In an air brake system, the 'brake pipe' running the length of the train is primarily used to:
- A. Provide structural support to the underframe only
- B. Supply drinking water to passenger coaches
- C. Carry compressed air and transmit brake application/release signals to each vehicle's brake system
- D. Carry electrical signalling data exclusively with no pneumatic function
Answer: Carry compressed air and transmit brake application/release signals to each vehicle's brake system
Explanation: Carry compressed air and transmit brake application/release signals to each vehicle's brake system — verified fact for Railway Mechanical Engineering Group B LDCE.
132. A general disadvantage of the older vacuum brake system (compared to air brake) that contributed to its phase-out was:
- A. Weaker braking force and slower brake application/release, limiting train length and speed
- B. It could only be used on locomotives, never on wagons or coaches
- C. It required no maintenance at all, making it too simple to regulate
- D. It generated more braking force than any train could safely handle
Answer: Weaker braking force and slower brake application/release, limiting train length and speed
Explanation: Weaker braking force and slower brake application/release, limiting train length and speed — verified fact for Railway Mechanical Engineering Group B LDCE.
133. A key reason Indian Railways phased out vacuum brakes in favour of air brakes on most rolling stock is that air brakes generally offer:
- A. No braking force at all, making them safer by default
- B. Faster, more effective, and more consistent braking performance, especially for longer and heavier trains
- C. Lower cost with no performance difference whatsoever
- D. A completely wireless braking mechanism
Answer: Faster, more effective, and more consistent braking performance, especially for longer and heavier trains
Explanation: Faster, more effective, and more consistent braking performance, especially for longer and heavier trains — verified fact for Railway Mechanical Engineering Group B LDCE.
134. The 'vacuum brake' system, historically used on Indian Railways before widespread adoption of air brakes, worked on the principle of:
- A. Using compressed air at very high pressure exclusively
- B. Using magnetic rail brakes with no pipe system at all
- C. Using a partial vacuum maintained in a brake pipe; a drop in vacuum applied the brakes
- D. Using an entirely electronic, non-mechanical braking signal
Answer: Using a partial vacuum maintained in a brake pipe; a drop in vacuum applied the brakes
Explanation: Using a partial vacuum maintained in a brake pipe; a drop in vacuum applied the brakes — verified fact for Railway Mechanical Engineering Group B LDCE.
135. An 'air brake system' on Indian Railways rolling stock works, in basic principle, by:
- A. Using only manual hand-levers on each wagon with no pneumatic component
- B. Using a vacuum created entirely by the locomotive's diesel engine exhaust with no compressed air involved
- C. Using magnetic force to stop the wheels directly with no friction elements
- D. Using compressed air pressure/pressure changes in a brake pipe to apply or release brake shoes/pads against the wheels
Answer: Using compressed air pressure/pressure changes in a brake pipe to apply or release brake shoes/pads against the wheels
Explanation: Using compressed air pressure/pressure changes in a brake pipe to apply or release brake shoes/pads against the wheels — verified fact for Railway Mechanical Engineering Group B LDCE.
136. The general purpose of a 'suspension system' on a wagon/coach bogie is to:
- A. Generate braking force independently of the brake system
- B. Increase the wagon's carrying capacity beyond its rated load
- C. Eliminate the need for any wheel maintenance
- D. Cushion the vehicle body from track irregularities, improving ride comfort/cargo safety and reducing wear on components
Answer: Cushion the vehicle body from track irregularities, improving ride comfort/cargo safety and reducing wear on components
Explanation: Cushion the vehicle body from track irregularities, improving ride comfort/cargo safety and reducing wear on components — verified fact for Railway Mechanical Engineering Group B LDCE.
137. A wagon's 'bogie' (undercarriage) performs a role broadly similar to a coach's or locomotive's bogie, mainly:
- A. Supporting the wagon body on wheelsets and providing suspension for a stable, safe ride
- B. Storing the cargo being transported
- C. Generating electrical power for the wagon's lights
- D. Acting as the wagon's braking lever only
Answer: Supporting the wagon body on wheelsets and providing suspension for a stable, safe ride
Explanation: Supporting the wagon body on wheelsets and providing suspension for a stable, safe ride — verified fact for Railway Mechanical Engineering Group B LDCE.
138. A flat wagon is generally used to carry:
- A. Only passengers with reserved seating
- B. Only perishable goods requiring refrigeration
- C. Long or oversized cargo such as containers, rails, or heavy machinery, on an open flat deck
- D. Only liquid cargo in a sealed tank
Answer: Long or oversized cargo such as containers, rails, or heavy machinery, on an open flat deck
Explanation: Long or oversized cargo such as containers, rails, or heavy machinery, on an open flat deck — verified fact for Railway Mechanical Engineering Group B LDCE.
139. A tank wagon on Indian Railways is specifically designed to carry:
- A. Passengers on suburban routes
- B. Liquid or gaseous cargo such as petroleum products, in a cylindrical tank body
- C. Livestock exclusively
- D. Bagged foodgrain exclusively
Answer: Liquid or gaseous cargo such as petroleum products, in a cylindrical tank body
Explanation: Liquid or gaseous cargo such as petroleum products, in a cylindrical tank body — verified fact for Railway Mechanical Engineering Group B LDCE.
140. A covered wagon (general category, broadly referred to by codes such as 'BCN') is primarily designed for:
- A. Carrying only liquid fuel in an open tank
- B. Carrying only oversized machinery with no roof needed
- C. Carrying passengers on long-distance routes
- D. Carrying goods that need protection from weather, such as foodgrain or general merchandise
Answer: Carrying goods that need protection from weather, such as foodgrain or general merchandise
Explanation: Carrying goods that need protection from weather, such as foodgrain or general merchandise — verified fact for Railway Mechanical Engineering Group B LDCE.
141. An open wagon of the general type commonly used for bulk commodities like coal (broadly referred to by codes such as 'BOXN') is primarily designed for:
- A. Carrying bulk, weather-tolerant goods that can be loaded/unloaded from an open top, such as coal or ore
- B. Carrying only passengers in an open-air seating arrangement
- C. Carrying livestock exclusively
- D. Carrying liquid petroleum products exclusively in a sealed tank
Answer: Carrying bulk, weather-tolerant goods that can be loaded/unloaded from an open top, such as coal or ore
Explanation: Carrying bulk, weather-tolerant goods that can be loaded/unloaded from an open top, such as coal or ore — verified fact for Railway Mechanical Engineering Group B LDCE.
142. A railway 'wagon' generally differs from a 'coach' in that a wagon is primarily meant for:
- A. Only running on narrow gauge track
- B. Being permanently attached to a locomotive
- C. Carrying only railway staff, never any cargo
- D. Carrying freight/goods, whereas a coach is meant for carrying passengers
Answer: Carrying freight/goods, whereas a coach is meant for carrying passengers
Explanation: Carrying freight/goods, whereas a coach is meant for carrying passengers — verified fact for Railway Mechanical Engineering Group B LDCE.
143. The general reason Indian Railways has been progressively replacing conventional ICF-design coaches with LHB-design coaches is primarily:
- A. To switch from steel to a completely different track gauge
- B. To reduce the total number of coaches per train to one
- C. To eliminate the need for periodic overhaul entirely
- D. To improve passenger safety and enable higher permissible speeds
Answer: To improve passenger safety and enable higher permissible speeds
Explanation: To improve passenger safety and enable higher permissible speeds — verified fact for Railway Mechanical Engineering Group B LDCE.
144. ICF, as in 'ICF coach' (the earlier widely-used Indian Railways coach design), stands for:
- A. Integral Coach Factory
- B. Interstate Cargo Facility
- C. Indian Carriage Federation
- D. International Coach Framework
Answer: Integral Coach Factory
Explanation: Integral Coach Factory — verified fact for Railway Mechanical Engineering Group B LDCE.
145. One key structural/safety difference often cited between LHB and older ICF coaches is:
- A. LHB coaches are designed with anti-climbing features and a stronger structure intended to reduce coach pile-up/telescoping in a collision
- B. LHB coaches have no braking system at all
- C. ICF coaches always run faster than LHB coaches
- D. ICF coaches are entirely made of aluminium while LHB coaches are wooden
Answer: LHB coaches are designed with anti-climbing features and a stronger structure intended to reduce coach pile-up/telescoping in a collision
Explanation: LHB coaches are designed with anti-climbing features and a stronger structure intended to reduce coach pile-up/telescoping in a collision — verified fact for Railway Mechanical Engineering Group B LDCE.
146. Compared to conventional ICF coaches, LHB coaches are generally regarded as offering:
- A. Identical suspension and safety characteristics to ICF coaches
- B. Wooden underframes instead of steel
- C. Lower maximum speed and no improvement in safety features
- D. Higher speed potential, improved anti-climbing/crash-safety features, and a smoother ride due to air-spring suspension
Answer: Higher speed potential, improved anti-climbing/crash-safety features, and a smoother ride due to air-spring suspension
Explanation: Higher speed potential, improved anti-climbing/crash-safety features, and a smoother ride due to air-spring suspension — verified fact for Railway Mechanical Engineering Group B LDCE.
147. LHB coaches, now widely adopted on Indian Railways, are named after:
- A. The city where the coaches are exclusively manufactured in India
- B. Linke Hofmann Busch, the German company whose design Indian Railways adopted/licensed
- C. An acronym for 'Light High-speed Bogie' with no company origin
- D. A former Railway Minister of India
Answer: Linke Hofmann Busch, the German company whose design Indian Railways adopted/licensed
Explanation: Linke Hofmann Busch, the German company whose design Indian Railways adopted/licensed — verified fact for Railway Mechanical Engineering Group B LDCE.
148. Which of the following is a genuine safety practice for mechanical staff working in a pit-line under a locomotive?
- A. Disconnecting all safety signage to work faster
- B. Working underneath while the locomotive is running at full power
- C. Allowing untrained staff to operate the locomotive controls during inspection
- D. Ensuring the locomotive is properly isolated/earthed and secured against movement before starting work underneath
Answer: Ensuring the locomotive is properly isolated/earthed and secured against movement before starting work underneath
Explanation: Ensuring the locomotive is properly isolated/earthed and secured against movement before starting work underneath — verified fact for Railway Mechanical Engineering Group B LDCE.
149. The general reason diesel locomotives require an 'air intake filtration' system is to:
- A. Reduce the locomotive's tractive effort intentionally
- B. Prevent dust and debris from entering the engine cylinders, which would accelerate wear
- C. Cool the traction motors directly
- D. Increase the noise generated by the engine
Answer: Prevent dust and debris from entering the engine cylinders, which would accelerate wear
Explanation: Prevent dust and debris from entering the engine cylinders, which would accelerate wear — verified fact for Railway Mechanical Engineering Group B LDCE.
150. An 'auxiliary generator' on a locomotive is generally used to supply power for:
- A. Track circuits used for signalling
- B. The main traction motors exclusively
- C. Only the horn and headlight, with no other function
- D. Battery charging and auxiliary/control circuits, separate from the main traction power circuit
Answer: Battery charging and auxiliary/control circuits, separate from the main traction power circuit
Explanation: Battery charging and auxiliary/control circuits, separate from the main traction power circuit — verified fact for Railway Mechanical Engineering Group B LDCE.
151. Diesel locomotive fuel tanks are periodically inspected mainly to check for:
- A. Signal aspect visibility
- B. Overhead wire tension
- C. Correct passenger seating capacity
- D. Leakage, corrosion, and water/contaminant accumulation that could affect engine performance
Answer: Leakage, corrosion, and water/contaminant accumulation that could affect engine performance
Explanation: Leakage, corrosion, and water/contaminant accumulation that could affect engine performance — verified fact for Railway Mechanical Engineering Group B LDCE.
152. A 'cab signalling'/'crew safety device' fitted in modern locomotives, from a mechanical/electrical maintenance perspective, is generally maintained to ensure:
- A. Replacing the entire braking system
- B. Increasing the locomotive's fuel consumption for testing purposes
- C. Allowing the locomotive to run without any crew supervision
- D. Reliable functioning to alert or assist the driver, supporting overall train operating safety
Answer: Reliable functioning to alert or assist the driver, supporting overall train operating safety
Explanation: Reliable functioning to alert or assist the driver, supporting overall train operating safety — verified fact for Railway Mechanical Engineering Group B LDCE.
153. Why is regular monitoring of a locomotive's lubricating oil condition (e.g., oil analysis) considered good maintenance practice?
- A. It has no bearing on engine health and is done only for record-keeping
- B. It can reveal early signs of internal wear or contamination before a major failure occurs
- C. It replaces the need for any other engine inspection permanently
- D. It is required only once in a locomotive's entire service life
Answer: It can reveal early signs of internal wear or contamination before a major failure occurs
Explanation: It can reveal early signs of internal wear or contamination before a major failure occurs — verified fact for Railway Mechanical Engineering Group B LDCE.
154. On Indian Railways, the term 'link' in relation to locomotive/crew scheduling generally refers to:
- A. A fastening used to join rail track segments
- B. A planned sequence/roster of duties or trains that a locomotive or crew is assigned to work over a period
- C. A physical mechanical coupling used only between wagons
- D. A type of brake used only on coaches
Answer: A planned sequence/roster of duties or trains that a locomotive or crew is assigned to work over a period
Explanation: A planned sequence/roster of duties or trains that a locomotive or crew is assigned to work over a period — verified fact for Railway Mechanical Engineering Group B LDCE.
155. A locomotive's 'buffer and coupling' arrangement mainly serves to:
- A. Filter incoming fuel before injection
- B. Cool the diesel engine radiator
- C. Connect the locomotive to the train and absorb/transmit longitudinal (pulling and buffing) forces
- D. Generate electrical power for onboard systems
Answer: Connect the locomotive to the train and absorb/transmit longitudinal (pulling and buffing) forces
Explanation: Connect the locomotive to the train and absorb/transmit longitudinal (pulling and buffing) forces — verified fact for Railway Mechanical Engineering Group B LDCE.
156. The primary reason for periodically checking and reprofiling locomotive wheel treads/flanges during maintenance is:
- A. To increase the locomotive's overall weight
- B. To reduce the number of axles on the bogie
- C. To change the locomotive's livery colour scheme
- D. To correct wear patterns and maintain the correct profile needed for safe, stable running and good rail contact
Answer: To correct wear patterns and maintain the correct profile needed for safe, stable running and good rail contact
Explanation: To correct wear patterns and maintain the correct profile needed for safe, stable running and good rail contact — verified fact for Railway Mechanical Engineering Group B LDCE.
157. A 'shunting locomotive' on Indian Railways is primarily used for:
- A. Hauling long-distance express trains at maximum speed
- B. Moving/marshalling wagons or coaches within yards and sheds at low speed
- C. Carrying passengers on suburban routes exclusively
- D. Powering signalling systems
Answer: Moving/marshalling wagons or coaches within yards and sheds at low speed
Explanation: Moving/marshalling wagons or coaches within yards and sheds at low speed — verified fact for Railway Mechanical Engineering Group B LDCE.
158. Locomotives designed for passenger service (like WDP/WAP classes) are generally geared for:
- A. Only shunting duties within yards
- B. Higher speed capability, suited to running fast passenger trains, with somewhat lower tractive effort than freight locomotives
- C. Maximum tractive effort with the lowest possible speed
- D. Exclusively hauling brake vans
Answer: Higher speed capability, suited to running fast passenger trains, with somewhat lower tractive effort than freight locomotives
Explanation: Higher speed capability, suited to running fast passenger trains, with somewhat lower tractive effort than freight locomotives — verified fact for Railway Mechanical Engineering Group B LDCE.
159. Locomotives designed for freight service (like WDG/WAG classes) are generally geared for:
- A. Operation exclusively in reverse direction
- B. Zero tractive effort, relying entirely on gravity
- C. Higher tractive effort at relatively lower maximum speed, suited to hauling heavy loads
- D. Maximum possible speed with minimal hauling capacity
Answer: Higher tractive effort at relatively lower maximum speed, suited to hauling heavy loads
Explanation: Higher tractive effort at relatively lower maximum speed, suited to hauling heavy loads — verified fact for Railway Mechanical Engineering Group B LDCE.
160. A locomotive's 'tractive effort' refers to:
- A. The electrical voltage supplied by the overhead equipment
- B. The total weight of the locomotive including fuel
- C. The pulling/pushing force the locomotive can exert at the wheel-rail interface to move a train
- D. The number of coaches painted on the locomotive's livery
Answer: The pulling/pushing force the locomotive can exert at the wheel-rail interface to move a train
Explanation: The pulling/pushing force the locomotive can exert at the wheel-rail interface to move a train — verified fact for Railway Mechanical Engineering Group B LDCE.
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