Quiz medium

Carriage & Wagon Theory for LDCE(Mech)

medium wagon abs

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1. What is the recommended method to create space for changing brake blocks on BMBS?

1. Use a hammer

2. Slip in a pry bar between brake block and wheel and force back

3. Apply full brakes

4. Remove the beam

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2. What is the minimum feed pipe pressure at the last wagon for a train up to 56 wagons?

1. 5.8 kg/cm²

2. 5.7 kg/cm²

3. 6.0 kg/cm²

4. 4.8 kg/cm²

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3. What is the minimum pressure at the last wagon's brake pipe for a train beyond 56 wagons?

1. 5.0 kg/cm²

2. 4.8 kg/cm²

3. 4.7 kg/cm²

4. 5.8 kg/cm²

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4. What are the five tests performed in a Single Wagon Test?

1. Leakage, Sensitivity, Application/Release, Graduated Application/Release, Slack Adjuster

2. Only Leakage and Application

3. Only Sensitivity and Insensitivity

4. Only Slack Adjuster check

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5. What is the purpose of the Single Wagon Test?

1. To test the locomotive

2. To ensure proper functioning of the air brake system on a single wagon

3. To test the track

4. To test the couplers

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6. In the KE distributor valve, what is the function of the 'A' controller?

1. To apply brakes

2. To charge CR and isolate CR pressure when brakes are applied (similar to cut off valve)

3. To release brakes

4. To limit pressure

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7. In the KE distributor valve, what is the function of the maximum pressure limiter?

1. To limit BP pressure

2. To limit maximum BC pressure to 3.8 ± 0.1 kg/cm²

3. To limit AR pressure

4. To limit application time

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8. In the KE distributor valve, what is the function of the minimum pressure limiter?

1. To limit maximum BC pressure

2. To rapidly charge BC to a determined pressure to overcome rigging resistance

3. To limit BP pressure

4. To limit AR pressure

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9. In the KE distributor valve, what is the function of the 'R' charger?

1. To release brakes quickly

2. To supply air from BP to AR and separate AR from BP when BP is less than AR

3. To charge the control reservoir

4. To limit application pressure

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10. In the KE distributor valve, what is the function of the U-controller?

1. To release brakes

2. To create initial BP drop during brake application (similar to quick service valve)

3. To charge the reservoir

4. To limit pressure

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11. In the KE distributor valve, what is the function of the three pressure valve?

1. To control three reservoirs

2. To control charging and discharging of BC based on BP change

3. To limit three pressures

4. To isolate three pipes

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12. What does the re-feeding test ensure?

1. That AR recharges quickly

2. That DV continues to supply air to BC if it leaks, maintaining pressure

3. That BP recharges

4. That the compressor works

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13. What is the BP pressure drop condition for the sensitivity test?

1. 0.3 kg/cm² in 60 seconds

2. 0.6 kg/cm² in 6 seconds

3. 1.5 kg/cm² in 10 seconds

4. 5.0 kg/cm² immediately

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14. What is the BP pressure drop condition for the insensitivity test?

1. 0.6 kg/cm² in 6 seconds

2. 0.3 kg/cm² in 60 seconds

3. 1.5 kg/cm² in 10 seconds

4. 5.0 kg/cm² immediately

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15. What does the insensitivity test check?

1. That brakes apply instantly

2. That DV does not operate due to a small drop in BP from minor leakage

3. That brakes release slowly

4. That the system is tight

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16. What does the sensitivity test check?

1. That brakes release quickly

2. That DV responds quickly to a drop in BP pressure

3. That there is no leakage

4. That the reservoirs charge

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17. What is the purpose of the overcharge protection test?

1. To see if the system can handle high pressure

2. To ensure CR and AR are not overcharged when BP is slightly overcharged

3. To test the safety valve

4. To check the compressor capacity

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18. What is the purpose of the charging time test?

1. To see how fast the train moves

2. To ensure all DVs operate with similar timings for uniform brake application

3. To check the compressor

4. To test the pipes

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19. Why is the pressure tightness test done before other tests?

1. It is easier

2. To avoid reworking if leakage is detected later

3. It is faster

4. It is mandatory

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20. What is the purpose of the pressure tightness test?

1. To check brake power

2. To check for leakage from any part of the DV

3. To test sensitivity

4. To test charging time

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21. What is the effect of a short pull on the double release valve lever?

1. It applies brakes

2. It opens the control reservoir release check valve

3. It charges the system

4. It isolates the distributor valve

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22. What is the function of the limiting device?

1. To limit BP pressure

2. To limit maximum BC pressure to 3.8 ± 0.1 kg/cm²

3. To limit AR pressure

4. To limit application time

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23. What happens in the quick service valve during brake application?

1. It increases BP pressure

2. It allows sudden entry of BP pressure into a large volume bulb

3. It releases BC pressure

4. It isolates the system

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24. What is the function of the auxiliary reservoir check valve?

1. To release air from AR

2. To charge AR and check back flow of AR pressure when BP drops

3. To isolate AR

4. To filter air to AR

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25. What is the function of the cut off valve in the C3W distributor valve?

1. It cuts off air to the brake cylinder

2. It connects BP to CR during charging and cuts off during application

3. It isolates the entire system

4. It releases brakes

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26. What are the three pressures acting on the main valve?

1. BP, AR, and Atmospheric

2. BP, CR, and BC

3. BP, FP, and AR

4. CR, AR, and FP

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27. In the C3W distributor valve, what does the main valve consist of?

1. One diaphragm

2. Two diaphragms (large and small)

3. Three diaphragms

4. No diaphragms

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28. What is the pay-out capacity of the slack adjuster per braking?

1. 10 mm

2. 20 mm

3. 30 mm

4. 40 mm

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29. What is the take-up capacity of the slack adjuster per braking?

1. 30 mm

2. 50 mm

3. 100 mm

4. 200 mm

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30. When does the slack adjuster pay out slack?

1. When slack is too large

2. When slack is too small

3. When slack is correct

4. Always

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31. When does the slack adjuster take up slack (pay-in)?

1. When slack is correct

2. When slack is too large

3. When slack is too small

4. Never

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32. What is the "A" dimension in a slack adjuster?

1. The length of the adjuster

2. The distance between control rod head and barrel when brakes are fully released

3. The diameter of the spindle

4. The spring force

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33. What happens when the handle of the Train Manager's emergency brake valve is opened?

1. Air enters the system

2. Air from brake pipe is exhausted into atmosphere

3. Brakes release

4. Reservoirs charge

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34. What must be done to the auxiliary reservoir after the hydraulic test?

1. Immediately paint it

2. Drain water completely and allow to dry with air jet

3. Seal it permanently

4. Apply grease inside

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35. What is the hydraulic test pressure for the auxiliary reservoir?

1. 10 kg/cm²

2. 12 kg/cm²

3. 14 kg/cm²

4. 16 kg/cm²

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36. What is used to ease the piston packing into the brake cylinder during assembly?

1. Metal hammer

2. Wooden spatula with round nose

3. Screwdriver

4. Bare hands

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37. During cut off angle cock overhaul, what must be done to the handle spring if heavily rusted?

1. Clean it

2. Replace it

3. Lubricate it

4. Ignore it

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38. What is the function of the leaf spring provided with the cut off angle cock stem?

1. To increase pressure

2. To press the operating handle downwards for mechanical lock

3. To open the valve

4. To close the valve

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39. What action is taken if leakage persists after changing the gasket in a coupling head?

1. The assembly is rejected

2. More gaskets are added

3. The clamp is tightened

4. The hose is replaced

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40. What is used to check leakage during hose coupling test?

1. Pressure gauge only

2. Soap solution

3. Immersing in water

4. Listening for sound

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41. What is the test pressure for hose coupling during leakage test?

1. 5 kg/cm²

2. 6 kg/cm²

3. 8 kg/cm²

4. 10 kg/cm²

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42. What is the marking requirement for twin pipe air brake fitted wagons?

1. "Twin Pipe" in black letters on white background

2. "Twin Pipe" in black letters on a yellow background encircled in a white band

3. "Twin Pipe" in red letters

4. "TP" only

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43. What is the first "Do" for twin pipe working of freight trains?

1. Do ensure BP is painted green

2. Do ensure all twin pipe wagons are operated in CC rakes only

3. Do ensure FP is painted white

4. Do ensure pressure gauges are working

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44. In a twin pipe system, what are the two pipes and their pressures?

1. BP 5 kg/cm² and FP 6 kg/cm²

2. BP 6 kg/cm² and FP 5 kg/cm²

3. Both at 5 kg/cm²

4. Both at 6 kg/cm²

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45. During the release stage, what happens to the brake cylinder?

1. It is pressurized further

2. It is vented to atmosphere

3. It is isolated

4. It charges the reservoirs

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46. What does a reduction in brake pipe pressure cause the distributor valve to do?

1. Connect auxiliary reservoir to brake cylinder

2. Vent the brake cylinder

3. Charge the reservoirs

4. Isolate the system

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47. For brake application, what must happen to the brake pipe pressure?

1. It must increase

2. It must drop

3. It must remain constant

4. It must fluctuate

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48. What happens to the brake cylinder during the charging stage?

1. It gets pressurized

2. It gets vented to atmosphere

3. It remains unchanged

4. It applies brakes

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49. During the charging stage of a single pipe system, what pressure is the brake pipe charged to?

1. 6.0 kg/cm²

2. 5.0 kg/cm²

3. 4.0 kg/cm²

4. 3.8 kg/cm²

50 / 50

50. What are the complete components of a single pipe graduated release air brake system?

1. Only distributor valve and brake cylinder

2. Distributor valve, pipe bracket, reservoirs, dirt collector, isolating cock, brake cylinder, angle cocks, hoses, pipes, TM valve, gauges, quick coupling

3. Only pipes and hoses

4. Only reservoirs and cylinders

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