Question Paper

Objective type Questions on AC coaches side

I. Select the correct answer

1. Name of the meter used to measure Air velocity( )

a.Multi meterc.Thermometer

b.Anemometer d.Ammeter

2. Rating of Static inverter used in SG AC Coaches( )

a.20 KVAc.25 KVA

b.35 KVAd.22.75 KVA

3. In regulator how many windings are available in Magnetic amplifier( )

a.6c.4

b.3d.5

4. Size of V belts used for 25KW Alternator( )

a.C121c.C122

b.C123d.C124

5. Name the meter used to measure relative humidity( )

a.PSYCROS meterc.Humidity meter

b.Multi meterd.Voltmeter

6. 1 ton of refrigeration is ( )

a.12 BTUc.1200BTU

b.120 BTUd.12000 BTU

7. Thermostat Setting for summer used in AC coaches ( )

a19, 19, 21c.17, 19, 21

b.22, 22, 24d.20, 21, 22

8. Calculate degree of Fahrenheit equivalent to 40C ( )

a.40Fc. 40F

b. 20Fd. 50F

9. The gap between the two halves of axile pulley should be ( )

a.0.5 1.0 mmc.3.0 4.0 mm

b.2.0 3.0 mmd.5.0 5.5 mm

10. Required level Torque Newton/meter to tightened the nuts and bolts OF Amar Raja cells (VRLA) connection ( )

a.10c.11

b.12d.13

11. What are the AH capacity of cells used in AC coaches

( )

a.800, 1100c.120, 800

b.500, 120d.120, 240

12. State the standing pressure of F 12 refrigerant used for in AC coaches( )

a.60 to 70c.70 to 80

b.80 to 90d.50 to 60

13. Name of the Acid used in lead acid cells( )

a.Sulpheric Acidc.Nitric acid

b.Hydrochloric Acidd.Phosphoric Acid

14. Give the Spg & Voltage of Fully charged cells( )

a.1220 & 2.2c.1200 & 2.2

b.1220 & 2.1d.1200 & 2.1

15. Cut in speed for B/L alternator for 25KW Alternator( )

a.17 KMPHc.20KMPH

b.19 KMPHd.22 KMPH

16. Inverter converts ( )

a.DC to ACc.AC to AC

b.DC to DCd.AC to DC

17. Function of SPP relay( )

a.Preventing single phasingc.Preventing shorting of phases

b.Both d.None

18. Function of proving relay( )

a.

Ensure of starting of

heater /compressor before blowerc.Ensure of starting of compressor before blower

b.

Ensure of starting of blower motor before compressor/heaterd.Ensure of starting of liquid receiver.

19. Cooling thermostats setting (mercury thermostats) in I AC coach( )

a.22, 24, 26c.17, 19, 21

b.24, 24, 26d.19, 19, 21

20. IGBT are used as ( )

a.

High frequency switching devicec.Low frequency switching device

b.Illuminating deviced.Amplifier

21. Battery fuse rating in AC coaches is ( )

a.250 Ac.600 A

b.400 Ad.200 A

22. No of regulators are available in I AC coaches( )

a.1c.2

b.3d.4

23. One RMPU AC coach is provided with how many compressors.( )

a.4 Nos sealed compressorc.4 Nos open type compressor

b.2 Nos sealed compressord.2 Nos open type compressor

24. PSI is the unit of ( )

a.Pressure c.Humidity

b.Temperatured.Velocity of gas

25. Boost charge of VRLA cells( )

a.2.3 V/Cellc.2.25 V/Cell

b.110 V/Celld.115 V/Cell

26. Trickle charging of VRLA cell( )

a.2.3 V/Cellc.2.25 V/Cell

b.110 V/Celld.115 V/Cell

27. No of MAs in 25 KW regulators( )

a.1c.2

b.3d.4

28. No of ETs in 25 KW regulators( )

a.1c.2

b.3d.4

29. Rectifier converts( )

a.DC to ACc.AC to AC

b.AC to DCd.DC to DC

30. HP cut out trips the compressor in Under Slung AC Coaches( )

a.17.6 Kg/cmc.0.76 Kg/cm

b.7.6 Kg/cmd.76 Kg/cm

31. LP cut out trips the compressor in Under Slung AC Coaches( )

a.17.6 Kg/cmc.0.76 Kg/cm

b.7.6 Kg/cmd.76 Kg/cm

32. Heater coil rating in I AC coaches is( )

a.3 KWc.4 KW

b.5 KWd.7 KW

33. Give the half load setting of R/R of 25 KW AC( )

a.95c.100

b.90d.85

34. Named the meter used to measure Vacuum( )

a.Micronc.Picron

b.Trivectord.Sicron

35. Give the diameter of Axle pulley used in AC coaches( )

a.546.6 mmc.500.6 mm

b.572.6 mmd.600.6 mm

36. Give the tension length of spring used in Tension rod of 25 KW Alternator( )

a.260 mmc.269 mm

b.265 mmd.275 mm

37. Why lead acid cells are called as Secondary cells( )

a.Since it cant be rechargec.Since it can be recharge

b.Since it cant charge initiallyd.None

38. What is Pre cooling ( )

a.

Cooling of AC coach before placing on PFc.Cooling of AC coach while running

b.

Cooling of AC coach after starting the train

d.None

39. Give the DC link voltage in static inverter( )

a.500 c.400

b.600d.700

40. Function of cooling pilot relay( )

a.

Ensure the function of Compressorc.Ensure the function of heater

b.

Ensure the function of Compressor/Heaterd.None of the above

Write down the abbreviation.

1PWM:

2VRLA:

3IGBT:

4FRPCPY:

5BTU:

II.True of False

01. Expansion valve expands the gas irrespective of load

(T / F)

02. M 22 gas is used in RMPUS(T / F)

03. Refrigerant requirement in U/S AC plant is approximate 27 Kg(T / F)

04. Refrigerant requirement in RMPU AC plant is approximate 15 Kg(T / F)

05. Vane relay ensured that blower motor has started before switching on compressor.(T / F)

06. TDR setting between 2 compressor of one RMPU is 10 Sec(T / F)

07. One coach (RMPU) is having 4 Nos of inverters(T / F)

08. BCK compressors are sealed compressor(T / F)

09. Manu rope compressors are sealed compressor(T / F)

010. ACCEL compressors are sealed compressor(T / F)

Write short notes:

1. Define Refrigeration?

2. Define Air-Conditioning?

3. Draw Refrigeration cycle and indicate the plants?

4. List out general tools?

5. List out Refrigeration tools?

6. List out types of AC Coaches?

7. List out parts of Under Slung AC coach?

8. List out parts of RMPU AC coach?

9. List out different types and makes of cells used in AC coaches with capacity?

10. List out different types and makes of RMPU's in AC coaches?

11. List out different makes of Inverters used in AC coaches?

12. How many cells are there in a AC coach?

13. What is operating voltage of Under Slung AC equipment?

14. What is operating voltage of RMPU AC equipment?

15. List out types of WRA?

16. How many types of gauges used in AC coach?

17. What are the operating Pressures of Under Slung AC coaches?

18. Draw the tube light circuit diagram?

19. What is thermostat setting of heating/cooling?

20. What is the function of AC compressor?

21. Type of regulator used in AC Coaches?

22. Rating of the fuse used for phase supply & field supply in Regulator of AC Coaches.

23. During train run if Alternator fails to generate, what action and what are the points to be checked.

24. Describe in detail items to be checked during trip schedule maintenance of AC Coach.

25. What attention to be paid to Alternator during trip schedule maintenance?

26. What is the capacity of cells used in AC Coaches?

27. What is the off load and on load voltage of a healthy cell.

28. What is the voltage & specific gravity of a fully charged lead acid cells?

29. During train run suddenly lights, fans and AC Plant gets off what is the reason & what action you are going to take?

30. How do you provide "through feeding" in AC Coach.

31. What action to be taken if compressor does not start?

32. Action to be taken if compressor shot circuits.

33. Action to be taken if compressor runs continuously.

34. Reason for High discharge pressure.

35. Reason for low section pressure.

36. Points to be checked before starting AC Plant and after starting AC Plant.

37. Duties of AC Coach Mechanic during train run.

38. Give reason for less cooling and remedies.

39. Describe procedure for replacement of Mane rope Compressor.

40. Describe procedure for carrying out lead test.

41. What is the normal current drawn by Mane rope Compressor.

42. What is the normal current drawn by RMPU plant?

43. Action to be taken when AC Plant trips due to low suction pressure.

44. Action to be taken when AC Plant trips due to high pressure.

45. AC Plant not working in auto mode. What action you are going to take.

46. How many types of WRA are there?

47. What is Cut in & Cut of pressure of WRA Cut out.

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