Quiz medium

Carriage & Wagon Theory for LDCE(Mech)

medium wagon bogie

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1. What is the speed of BOXN with CASNUB 22 NLB at 22.3t axle load in loaded condition?

1. 100 km/h

2. 80 km/h

3. 75 km/h

4. 60 km/h

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2. What is the speed of BOXN with CASNUB 22 NLB at 22.3t axle load in empty condition?

1. 100 km/h

2. 80 km/h

3. 75 km/h

4. 60 km/h

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3. How many snubber springs are used in BOXNEL with CASNUB 22 NLC?

1. 4

2. 6

3. 8

4. 10

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4. How many inner springs are used in BOXNEL with CASNUB 22 NLC?

1. 8

2. 10

3. 12

4. 14

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5. How many outer springs are used in BOXNEL with CASNUB 22 NLC?

1. 12

2. 14

3. 16

4. 18

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6. What AAR specification does premium rail grease meet?

1. M-942-98

2. M-101-95

3. R-16-93

4. G-72-03

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7. What is used to avoid fretting corrosion between backing ring and cone side face?

1. Extra grease

2. Steel spacer

3. Polymer spacer changing steel-steel contact to steel-polymer contact

4. Bronze washer

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8. What is eliminated by removing the seal wear ring in Timken Class K design?

1. Bearing weight

2. Axle grooving and resulting scrapping of seal wear ring

3. Need for lubrication

4. Need for adapter

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9. What material is used for the cage in Class K bearings?

1. Steel

2. Brass

3. Polyamide (reinforced polymer)

4. Aluminum

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10. What are the advantages of low-torque seals in Class K bearings?

1. Cheaper cost

2. Best protection against contaminants and lower fuel operating costs

3. Easier installation

4. Lighter weight

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11. What is the AAR specified limit for seal wear ring groove depth in axle journals?

1. 0.0508 mm

2. 0.127 mm

3. 0.254 mm

4. 0.5 mm

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12. What is the maximum depth to which cone back face can be machined for salvage?

1. 0.127 mm

2. 0.254 mm

3. 0.5 mm

4. 1.0 mm

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13. What is the AAR specified limit for cone back face fretting wear depth?

1. 0.0508 mm

2. 0.127 mm

3. 0.254 mm

4. 0.5 mm

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14. By how much does L10 life of Class E bearing reduce at 25t axle load?

1. 25%

2. 40%

3. 52%

4. 65%

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15. What are the indicators of potential hot box cases?

1. Clean bearings

2. Grease oozing, burning smell, missing end cap bolts, loose backing rings, burnt EM pads

3. Cool temperature

4. New paint

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16. What is the laid down wheel gauge distance for BG?

1. 1676 mm

2. 1600+2/-1 mm

3. 1600±2 mm

4. 1676+2/-1 mm

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17. What is the permissible variation in tread diameter after fresh turning on the same axle?

1. Not exceed 0.2 mm

2. Not exceed 0.5 mm

3. Not exceed 1.0 mm

4. Not exceed 1.5 mm

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18. What is the required assembly pressure build-up during wheel pressing?

1. 200-300 kg per mm dia

2. 300-400 kg per mm dia

3. 400-600 kg per mm dia

4. 600-800 kg per mm dia

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19. What is the required interference between wheel seat and bore during re-axling?

1. 0.5 mm per meter dia

2. 1 mm per meter dia (0.001 mm per mm)

3. 2 mm per meter dia

4. 0.1 mm per meter dia

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20. What is the minimum service diameter of wheel disc in 25T axle load with CASNUB 22 NLC?

1. 1000 mm

2. 963 mm

3. 950 mm

4. 906 mm

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21. What is the condemning wheel seat diameter for BOXNS with LWLH25 bogie?

1. 214 mm

2. 212 mm

3. 211 mm

4. 207 mm

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22. What is the condemning wheel seat diameter for BOXNEL, BOYEL with CASNUB 22 NLC?

1. 213 mm

2. 211 mm

3. 207 mm

4. 202 mm

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23. What is the condemning wheel seat diameter for axles used in BOXN, BCN with CASNUB 22 NLB/HS?

1. 213 mm

2. 211 mm

3. 207 mm

4. 202 mm

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24. What is the lateral clearance between side frame and axle box/adapter for 22NL, NLB, NLM?

1. 25 mm

2. 16 mm

3. 18 mm

4. 10 mm

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25. What is the lateral clearance between side frame and bolster for 22NL, NLB, NLM, NLC?

1. 16 mm

2. 18 mm

3. 25 mm

4. 10 mm

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26. What packing may be required to achieve proper buffer height?

1. 5 mm and 10 mm

2. 10 mm and 25 mm

3. 12 mm and 35 mm

4. 15 mm and 30 mm

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27. What should be the combined drop of center pivot from new bogie?

1. Not more than 10 mm

2. Not more than 15 mm

3. Not more than 20 mm

4. Not more than 25 mm

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28. What is used to retain friction shoes during disassembly?

1. Chains

2. Assembly pin (12mm dia x 250 mm long)

3. Ropes

4. Clamps

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29. What is the first step in bogie disassembly?

1. Remove springs

2. Remove shackle of center pivot pin

3. Remove side frame key

4. Remove wheel sets

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30. In CASNUB 22 NL, 22NLB, etc., how is the brake head attached?

1. Bolted

2. Integrally cast with end piece casting, welded to brake beam channel

3. Riveted

4. Pinned

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31. What is the procedure for removing brake heads from CASNUB 22W(M) brake beam?

1. Cut them off

2. Remove split pin and washer, remove pin securing brake shoe adjuster

3. Unscrew them

4. Heat and remove

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32. What is the condemning free height for CASNUB 22HS(Mod-I) snubber spring?

1. 304 mm

2. 295 mm

3. 289 mm

4. 285 mm

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33. What is the condemning free height for CASNUB 22HS outer spring?

1. 260 mm

2. 250 mm

3. 245 mm

4. 240 mm

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34. What is the condemning free height for PU side bearer with two rings?

1. 134 mm

2. 132 mm

3. 130 mm

4. 128.5 mm

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35. What is the condemning free height for PU side bearer with three rings?

1. 142.5 mm

2. 140 mm

3. 137 mm

4. 135 mm

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36. What is the condemning free height for metal bonded rubber side bearer pad?

1. 114 mm

2. 112 mm

3. 109 mm

4. 107 mm

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37. What is the condemning free height for elastomeric pad?

1. 46 mm

2. 44 mm

3. 42 mm

4. 40 mm

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38. What is the wear limit for bolster land surface according to Table 6.1?

1. 444 mm to 438 mm (6 mm wear)

2. 450 mm to 440 mm

3. 440 mm to 430 mm

4. 500 mm to 490 mm

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39. What adapter is used in LWLH25 bogie?

1. Class E adapter

2. Narrow jaw adapter to drg no. WD-15020-S/3

3. Wide jaw adapter

4. Modified adapter

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40. What adapter is used in retrofitted CASNUB 22W bogies?

1. Standard wide jaw adapter

2. Modified wide jaw adapter to drg no. WD-85053-S/1

3. Narrow jaw adapter

4. Class K adapter

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41. What is the permissible limit for notches/scratches/nicks on axle for reclamation?

1. Less than 2 mm

2. Less than 3 mm

3. Less than 4 mm

4. Less than 5 mm

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42. What should be stamped on wheel hub fillet after UST?

1. Date only

2. As per RDSO drawing No. WD-81089-S/1

3. Workshop code only

4. Serial number only

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43. When do wheel sets not require UST according to the document?

1. Always require UST

2. If fitted back under the same wagon after removal in open line

3. Only if new

4. Only if from workshops

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44. What is the drawing number for wheel tread intermediate profile?

1. WD-88021

2. WD-89060-S/2

3. WD-85079-S/2

4. WD-97049-S/3

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45. What profile is used for new wheels to reduce wear and increase wheel life?

1. Standard 1 in 20 taper

2. Worn wheel profile or worn adapted profile

3. Flat profile

4. Convex profile

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46. What are the complete components of CASNUB bogie assembly?

1. Only wheels and frame

2. Wheel set, adapter, side frames, bolster, spring plank, springs, wedges, center pivot, side bearers, elastomeric pad, brake gear, brake beam

3. Only springs and frame

4. Only brake gear

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47. What type of center pivot is used in other CASNUB versions?

1. Flat Type

2. Spherical Type

3. Conical Type

4. Pin Type

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48. What type of center pivot is used in CASNUB 22HS, HS(Mod-I), HS(Mod-II)?

1. Spherical Type

2. Flat Type

3. Conical Type

4. Cylindrical Type

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49. What is the wheel diameter for CASNUB 22NLC bogie?

1. 1000 mm new, 906 mm condemn

2. 950 mm new

3. 840 mm new, 780 mm condemn

4. 915 mm new

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50. Which bogie versions have been phased out considerably according to the document?

1. 22HS and 22HS Mod-I

2. 22W and 22W retrofitted

3. 22NL and 22NLB

4. LCCF 20(C) and LWLH25

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