1. Alternator is a device that converts [ a ]
a. Mechanical energy into electrical energy
b. Electrical energy into mechanical energy
c. Chemical energy into electrical energy
d. None of the above
Answer - a. Mechanical energy into electrical energy
2. Both field winding and 3 phase winding of AC coach alternator 120V are provided on _____ [ a]
a. Stator
b. Rotor
c. Both a and b
d. None
Answer -a. Stator
3. TL/AC coach alternator 120V designed to have ______________ [a ]
a. Residual magnetism
b. Permanent magnetism
c. Both a and b
d. None of the above
Answer -a. Residual magnetism
4. Recommended Cut in speed of 4.5 KW TL alternator is by RDSO with MA RR unit _____ [ a ]
a. 357 rpm
b. 600 rpm
c. 1100 rpm
d. 2500 rpm
Answer - a. 357 rpm
5. Minimum speed for full output of 4.5 KW 120V TL alternator, recommended by RDSO is ___ [ b ]
a. 357 rpm
b. 600 rpm
c. 1500 rpm
d. 2500 rpm
Answer - b. 600 rpm
6. Maximum speed of TL/AC coach alternator is [ d ]
a. 400 rpm
b. 800 rpm
c. 1500 rpm
d. 2500 rpm
Answer -d. 2500 rpm
7. Field coils of 120V TL/AC coach alternator are connected in [ a ]
a. Series
b. Parallel
c. Star
d. Delta
Answer - a. Series
8. Three phase windings of 120V TL/AC coach alternator are connected in [a ]
a. Star
b. Delta
c. Series
d. Parallel
Answer - a. Star
9. Size of V belts used for driving 110V 4.5KW TL alternators [ a]
a. C122
b. C118
c. C124
d. None
Answer - a. C122
10. Size of V belt used for driving 110V, 18, 22.5KW AC coach Alternators [ a ]
a. C122
b. C118
c. C124
d. None
Answer - a. C122
11. Number of V belts used for driving 110V 4.5KW TL alternator is ___________ [ a ]
a. 4
b. 6
c. 12
d. None
Answer - a. 4
12. Number of V belts used for driving 110V 18KW & 25KW AC alternator is _______ [ c ]
a. 4
b. 6
c. 12
d. None
Answer - c. 12
13. DC output voltage of Alternator /Regulator of 110V TL/AC coach is [ a ]
a. (110-140) DC
b. (70-90) DC
c. (90-120) DC
d. None
Answer - a. (110-140) DC
14. Rated DC output current of 4.5KW 110V Alternator is ____________ [ a ]
a. 37.5A
b. 19A
c. 43A
d. None
Answer - a. 37.5A
15. Rated DC output current of 18KW 110V Alternator is ____________ [ c ]
a. 193A
b. 175A
c. 135A
d. None
Answer - c. 135A
16. Rated DC output current of 25KW 110V Alternator is ____________ [ a ]
a. 193A
b. 175A
c. 135A
d. None
Answer - a. 193A
17. Pitch circle diameter of Axle pulley of 110V TL system [ c ]
a. 200mm
b. 140mm
c. 572.6mm
d. None
Answer - c. 572.6mm
18. Pitch circle diameter of Axle pulley of 110V AC coach system [ c ]
a. 200mm
b. 584mm
c. 572.6mm
d. None
Answer - c. 572.6mm
19. As per the latest SMI, the voltage setting of alternator 4.5KW 110V for passenger train with flooded batteries is ____________ [ c ]
a. 127V DC
b. 124V DC
c. 128.5V DC
d. None
Answer - c. 128.5V DC
20. As per the latest SMI, the voltage setting of ac alternator 18KW 110V with flooded batteries is [ c ]
a. 129V DC
b. 124V DC
c. 128V DC
d. None
Answer - c. 128V DC
21. As per the latest SMI, the voltage setting of alternator 4.5KW 110V for passenger train with VRLA
batteries is ____________ [ b ]
a. 123+/-0.5V DC
b. 128.5+/-0.5V DC
c. 121+/-0.5V DC
d. None
Answer - b. 128.5+/-0.5V DC
22. As per the latest SMI _____the voltage setting of alternator 4.5KW 110V for mail/express trains with VRLA batteries is ____________ [ b ]
a. 123+/-0.5V DC
b. 128.5+/-0.5V DC
c. 121+/-0.5V DC
d. None
Answer - b. 128.5+/-0.5V DC
23. As per the latest SMI the voltage setting of alternator 4.5KW 110V for super fast trains with VRLA batteries is ____________ [ b ]
a. 123+/-0.5V DC
b. 128.5+/-0.5V DC
c. 121+/-0.5V DC
d. None
Answer - b. 128.5+/-0.5V DC
24. As per the latest SMI the voltage setting of AC coach alternator 110V for passenger train with VRLA batteries is ____________ [ a ]
a. 128+/-0.5V DC
b. 127+/-0.5V DC
c. 126+/-0.5V DC
d. None
Answer - a. 128+/-0.5V DC
25. As per the latest SMI the voltage setting of AC coach alternator 110V for Mail/express train with VRLA batteries is ____________ [ a ]
a. 128+/-0.5V DC
b. 127+/-0.5V DC
c. 126+/-0.5V DC
d. None
Answer - a. 128+/-0.5V DC
26. As per the latest SMI the voltage setting of AC coach alternator 110V for super fast train with VRLA batteries is ____________ [ a ]
a. 128+/-0.5V DC
b. 127+/-0.5V DC
c. 126+/-0.5V DC
d. None
Answer - a. 128+/-0.5V DC
27. The purpose of TL Alternator used in Railways. [ d ]
a. Charging the caoch battery on train run
b. Working of lights and fans in the coach during train run
c. Sharing the load to other coaches in case of emergency
d. All the three above
Answer - d. All the three above
28. The capacity of alternator used for BG coach 110V Train Lighting system. [ b ]
a. 3KW
b. 4.5KW
c. 12KW
d. None
Answer - b. 4.5KW
29. The capacity of alternator used for BG coach 110V roof mounted AC coach [ c ]
a. 12KW
b. 18KW
c. 25KW
d. None
Answer - c. 25KW
30. The capacity of alternator used for BG coach 110V under slung AC caoch. [ c ]
a. 25KW
b. 12KW
c. 18KW
d. None
Answer - c. 18KW
31. The PCD (pitch circle diameter) of 25KW 110V alternator pulleys is [ b ]
a. 584mm +/- 0.4mm
b. 200+/-0.3 mm
d. None
c. 100 mm
Answer - b. 200+/-0.3 mm
32. The field resistance of 4.5KW 110V TL alternator has [ a ]
a. 4.5 +/-0.5 ohms
b. 6.0+/-0.5 ohms
c. 10+/-0.5 ohms
d. None
Answer - a. 4.5 +/-0.5 ohms
33. The resistance between two phases of 4.5KW 110V TL alternator is [ a ]
a. 0.4 +/-0.05 ohms
b. 0.8 +/-0.10 ohms
c. 4.5 +/-0.5 ohms
d. None
Answer - a. 0.4 +/-0.05 ohms
34. The purpose of providing anti rotating clamp near suspension arrangement of alternator is [ d ]
a. Not to rotate suspension pin of alternator
b. Not to damage the nylon bushes of alternator/ suspension bracket
c. Not to damage the suspension bracket/boss of alternator
d. All of the above
Answer - d. All of the above
35. The insulation material recommended for alternator windings of 4.5 KW 110V shall be [ c ] __________ class.
a. A
b. B
c. F
d. None
Answer - c. F
36. The voltage setting of Alt/RR unit is to be set in far with current and RPM for 4.5KW is [ a ]
a. Half rated capacity of the alt as load as 1500 RPM
b. ¼ rated capacity of the alt as load at 1000 RPM
c. Full rated capacity of alt as load at 2550 RPM
Answer - a. Half rated capacity of the alt as load as 1500 RPM
37. While measuring insulation resistance of 110V alternator/rectifier cum regulator the rating of megger is to be used is [ b ]
a. 100V DC megger
b. 500V DC megger
c. Both a nad b
d. None
Answer - b. 500V DC megger
38. The resistance between two phase of 25KW KEL alternator is about [ a ]
a. 0.0530746 ohms
b. 0.034 to 0.038
c. 44.2 mille ohms
d. None
Answer - a. 0.0530746 ohms
39. The field resistance of 25KW KEL alternator about [ a ]
a. 9.7568 ohms
b. 8+/-0.5 ohms
c. 10.72 ohms
d. None
Answer - a. 9.7568 ohms
40. The gap between two halves of axle pulley to be maintained is [ a ]
a. 3.0 +/-0.5 mm
b. 6mm +/- 0.5 mm
c. 4mm +/- 0.5 mm
d. None
Answer - a. 3.0 +/-0.5 mm
41. Codal life of 4.5, 18, 22.75 & 25 KW alternator / RR unit [ a ]
a. 12 years
b. 25 years
c. 15 years
d. None
Answer - a. 12 years
42. Codal life of 120 AH VRLA Battery [ b ]
a. 5 years
b. 4 years
c. 3 years
d. None
Answer - b. 4 years
43. Codal life of 120 AH Flooded Battery [ b ]
a. 5 years
b. 4 years
c. 3 years
d. None
Answer - b. 4 years
44. Codal life of Battery charger [ b ]
a. 12 years
b. 15 years
c. 25 years
d. None
Answer - b. 15 years
45. Codal life of Coach wiring [ b ]
a. 12 years
b. 15 years
c. 20 years
d. None
Answer - b. 15 years
46. Codal life of Carriage fans [ a ]
a. 10 years
b. 12 years
c. 15 years
d. None
Answer - a. 10 years
47. The distance to be maintained while fixing axle pulley on wheel, from wheel hub to axle pulley outer wedge for 25 KW alternator is [ a ]
a. 225 mm
b. 240 mm
c. 145 mm
d. None
Answer - a. 225 mm
48. The distance to be maintained while fixing axle pulley on wheel, from wheel hub to axle pulley outer wedge for 18 KW alternator is [ b ]
a. 225 mm
b. 240 mm
c. 145 mm
d. None
Answer - b. 240 mm
49. The distance to be maintained while fixing axle pulley on wheel, from wheel hub to axle pulley outer wedge for 4.5 KW alternator is [ c ]
a. 225 mm
b. 240 mm
c. 145 mm
d. None
Answer - c. 145 mm
50. ‘V’ belt dropping/smoking/burning due to mechanical failure [ c ]
a. Brake block jamming
b. Guide cups of damper’s have dropped
c. Both a and b
d. None
Answer - c. Both a and b
51. ‘V’ belt dropping/smoking/burning due to electrical failure [ d ]
a. Load on Alt is heavy
b. Wrong alignment
c. Loose/excessive tension
d. All of the above
Answer - d. All of the above
52. The minimum insulation resistance to be maintained for 4.5KW alternator is [ b ]
a. 1 Mega ohm
b. 2 Mega ohm
c. 20 Mega ohm
d. None
Answer - b. 2 Mega ohm
53. The minimum insulation resistance to be maintained for 18 & 25 KW alternators [ b ]
a. 20 mega ohm
b. 2 Mega ohm
c. 5 Mega ohm
d. None
Answer - b. 2 Mega ohm
54. No. of ET’s used in 25 KW RR Unit MA type [ c ]
a. 2
b. 1
c. Zero
d. None
Answer - c. Zero
55. No. of MA’s used in 25 KW MA type RR Unit [ a ]
a. 2
b. 1
c. Zero
d. None
Answer - a. 2
56. Width of grooved axle pulley of 4.5KW alternator is [ ]
a. 200mm
b. 190mm
c. 136mm
d. None
Answer -
57. Width of grooved axle pulley of 18 and 25 KW alternator is [ ]
a. 200 mm
b. 190 mm
c. 136 mm
d. None
Answer -
58. The type of suspension bushes are to be provided TL/AC alternators/ suspension bracket as per RDSO specification no RDSO / PE/Ac/0006/99 (Rev.0) [ b ]
a. Cast nylon bushes
b. Nylon 66 bushes
c. MS bushes
d. All of the above
Answer - b. Nylon 66 bushes
59. Residual magnetism lost in the alternator core the reason is [ c ]
a. Field polarity changed
b. Alternator is in idle condition for long time
c. Both a and b
d. None of the above
Answer - c. Both a and b
60. As per the Railway Board letter No. 2006/Elec(G)/138/3Pt. I unit Exchange spare recommended for alternators and Regulators for TL/AC depot [a ]
a. 5%
b. 10%
c. 15%
d. None
Answer - a. 5%
61. ERRU stands for [ a ]
a. Electronic Rectifier cum Regulator Unit
b. Electromagnetic Rectifier cum Regulator unit
c. Electrostatic Rectifier cum Regulator Unit
d. None
Answer - a. Electronic Rectifier cum Regulator Unit
62. IGBT stands for [ a ]
a. Insulated Gate Bipolar Transistor
b. Injection Gate Bipolar Transistor
c. Indicator gate Bipolar Transistor
d. None
Answer - a. Insulated Gate Bipolar Transistor
63. IGBT is [ a ]
a. Fast switching device
b. Slow switching device
c. Very fast switching device
d. None
Answer - a. Fast switching device
64. The size of capacity of fuses to be provided for 25kW ERRU in phase circuit [ b ]
a. 160A
b. 200A
c. 220A
d. None
Answer - b. 200A
65. UVC used in ERRU must be [ a ]
a) Suitable to work with all capacities
b) Suitable to work with all makes
c) Both a and b
d) None
Answer - a) Suitable to work with all capacities
66. The battery charging current limit with 4.5kW ERRU is to be set at [ a ]
a. 24A +/-2A
b. 12A +/- 2A
c. 36A +/- 2A
d. None
Answer - a. 24A +/-2A
67. TL alternator 4.5 KW 130 V is_______ [ a ]
a) 4 V belts drive machine
b) 6 V belts drive machine
c) 12 V belts drive machine
d) None of the above
Answer - a) 4 V belts drive machine
68. Non drive end bearing of 4.5 kw 120v 4.5kw TL alternator is__ [ a ]
a) SKF 6309
b) SKF NU311
c) SKF 6200
d)None
Answer - a) SKF 6309
69. Driving end bearing of 4.5 kw 120 V 4.5 kw TL alternator is_____ [ b ]
a) SKF 6309
b) SKF NU311
c) SKF 6200
d)None
Answer - b) SKF NU311
70. Recommended Cut in speed of 4.5 kw TL alternator is by RDSO with [ a ] MA RR unit
a) 357 rpm
b) 600 rpm
c) 1100 rpm
d)2500rpm
Answer - a) 357 rpm
71. Minimum speed for full output of 4.5 kw 120V TL alternator, [ b ] Recommended by RDSO is
a) 357 rpm
b) 600 rpm
c) 1100 rpm
d)2500rpm
Answer - b) 600 rpm
72. Field coils of 120VTL/AC coach alternator are connected in [ a ]
a) Series
b) Parallel
c) Star
d)Delta
Answer - a) Series
73. Three phase windings of 120V TL/AC coach alternator are connected in [ a ]
a) Star
b) Delta
c) Series
d)Parallel
Answer - a) Star
74. Field coils of TL coach alternators are located on [ a ]
a) Stator
b) Rotor
c) Both a and b
d) None
Answer - a) Stator
75. Each field coil of TL/AC coach alternator embraces _______ total number of there phase winding slots. [ a ]
a) Half of the
b) One fourth of the
c) Three fourth of the
d) None
Answer - a) Half of the
76. Size of V belts used for driving 110V 4.5 kw TL alternators [ a ]
a) C122
b) C118
c) C124
d) None
Answer - a) C122
77. Number of V belts used for driving 110 V 4.5 kw TL alternator is [ a ]
a) 4
b) 6
c) 12
d) None
Answer - a) 4
78. Numbers of alternator pulleys are available on 4.5 kw TL Alternator. [ a ]
a) 1
b) 2
c) 3
d) None
Answer - a) 1
79. Numbers of Alternators pulleys are available on BG AC coach Alternator. [ b ]
a) 1
b) 2
c) 3
d) None
Answer - b) 2
80. Residual magnetism retains in ____________ [ b ]
a) Rotor core
b) Stator Core
c) Rotor teeth
d) None
Answer - b) Stator Core
81. Number of slots are available in stator for 3Phase ac winding in 4.5 KW 120V Alternator
a) 36
b) 60
c) 18
d) None
Answer - a) 36
82. 3 Phase AC voltages are first produced in ac winding in Alternator by [ a ]
a) Residual magnetism
b) Permanent magnetism
C) Both a and b
d) None
Answer - a) Residual magnetism
83. When the rotor of 4.5 kw 120V alternator is rotated by hand the voltage developed in the 3 phase winding will be
a) 3.5 v
b) 12v
c) 24v
d) None
Answer - a) 3.5 v
84. DC output voltage of Alternator/Regulator of 110 V TL/AC coach is [ a ]
a) (110-140) DC
b) (70-90) DC
c) (90-120) DC
d)None
Answer - a) (110-140) DC
85. Rated DC output current of 4.5kw 110v Alternator is [ a ]
a) 37.5A
b) 19A
c) 43A
d)None
Answer - a) 37.5A
86. Rated DC output current of 3kw 110v Alternator is [ b ]
a) 37.5A
b) 19A
c) 43A
d)None
Answer - b) 19A
87. Rated DC output current of 25kw 110v Alternator is [ a ]
a) 193A
b) 175A
c) 135A
d)None
Answer - a) 193A
88. Pitch circle diameter of Axle pulley of 110v TL system [ c ]
a) 200mm
b) 140mm
c) 572.6mm
d)None
Answer - c) 572.6mm
89. Pitch circle diameter of Axle pulley of 110v AC coach system [ c ]
b) 200mm
b) 140mm
c) 572.6mm
d)None
Answer - c) 572.6mm
90. As per the latest SMI, the voltage setting of alternator 4.5kw 110v for Express/ mail trains with flooded batteries is _________
a) 128.5v DC
b) 124v DC
c) 122v DC
d)120v DC
Answer - a) 128.5v DC
91. As per the latest SMI, the voltage setting of AC coach alternator 110v for passenger train with VRLA batteries is
a) 128+/-0.5vDC
b) 127 +/- 0.5vDC
c) 126 +/-0.5vDC
d)None
Answer - a) 128+/-0.5vDC
92. The purpose of TL Alternator used in Railways [ d ]
a) Charging the coach battery on train run
b) Working of lights and fans in the coach during train run
c) Sharing the load to other coaches in case of emergency
d) All the above
Answer - d) All the above
93. The purpose of Ac coach Alternator used in Railways [ d ]
a) Charging the coach battery on train run
b) Working of lights and fans in the coach during train run
c) Sharing the load to other coaches in case of emergency
d) All the above
Answer - d) All the above
94. The capacity of alternators are used for BG coach 110v Train Lighting system. [ b ]
a) 3kw
b)4.5kw
c)12kw
d)None
Answer - b)4.5kw
95. The capacity of alternators are used for BG 110v roof mounted AC coach [ c ]
a) 3kw
b) 18kw
c)25kw
d)None
Answer - c)25kw
96. Number of Alternators are provided for AC sleeper, AC chair car, AC composite coach
a) 1
b)2
c)3
d)None
Answer - a) 1
97. The AC winding/ Main winding of TL/AC coach alternator has _______ phase winding
a) Single
b) Double
c) Three
d) None
Answer - a) Single
98. The safety items of TL/AC alternator are [ a ]
a) Suspension hanger pin with bushes and Cottar Pin
b) Alternator Suspension arrangement
c) Alt pully & nut
d) All the above
Answer - a) Suspension hanger pin with bushes and Cottar Pin
99. NU 311 bearing is [ a ]
a) Roller bearing
b) Ball bearing
c) Both a and b
d) None
Answer - a) Roller bearing
100. The field resistance of 4.5kw 110v TL alternators has [ a ]
a) 4.5+/-0.5 ohms
b) 6.0+/-0.5 ohms
c) 10+/-0.5 ohms
d) None
Answer - a) 4.5+/-0.5 ohms
101. MA type RR units are working on the principle [ a ]
a) Saturation and de saturation of magnetic core
b) Mutual induction
c) BJT
d) None
Answer - a) Saturation and de saturation of magnetic core
102. Generally the voltage setting of the alternator is to be set at_______ At 1500rpm
a) Full rated current
b) Half rated current
c) 2/3rd rated current
d) None
Answer - b) Half rated current
103. Both directions of train run, the polarity of Dc output supply of TL/AC alternator [ b ]
a) Changes
b)Do not change
c)Change at start
d) None
Answer - b)Do not change
104. The mating of pulley with shaft of TL/AC alternator shall be [ a]
a) 80%
b) 70%
c) 60%
d)50%
Answer - a) 80%
105. The cleat of alternator is to be made of [ a]
a) Fibre glass in forced fire retardant DNC
b) Bakelite
c) Phenolicd
d) None
Answer - a) Fibre glass in forced fire retardant DNC
106. Rotor shaft of KEL 110v 4.5kw alternator made up of [ a]
a) EN 24
b) EN 8
c)Both a and b
d)None
Answer - a) EN 24
107. Type of suspension bushes to be used while mounting alternators [ b ] as per latest RDSO instructions are
a) Cast Nylon
b)Nylon 66
c)MS
d)None
Answer - b)Nylon 66
108. The insulation resistance of alternator when measured with megger the IR value should not be less than
a) 2 mega ohms
b)5 mega ohms
c)both a and b
d)None
Answer - b)5 mega ohms
109. In case of over voltage in 4.5kw 120v RR unit, the tripping voltage of relay may be set at
a) 145+/-2
b) 150+/-2
c) 135+/-2
d)None
Answer - a) 145+/-2
110. The number of safety chains provided for 18kw and 25kw alternator [ b ]
a) 2
b) 3
c) 4
d)None
Answer - b) 3
111. The cut in speed of 25kw alternator is not more than [ a ]
a) 400rpm
b) 600rpm
c) 800rpm
d)None
Answer - a) 400rpm
112. The MFO of 25 kw alternator is not more than [ c ]
a) 400rpm
b) 600rpm
c) 800rpm
d)None
Answer - c) 800rpm
113. The field resistance of 25 kw KEL alternator about [ a ]
a) 9.7568 ohms
b) 8 +/-0.5 ohms
c) 10.72 ohms
d)None
Answer - a) 9.7568 ohms
114. To prevent breakage of shaft during service the following test should be Done as per RDSO SMI
a) Non destruction dye-penetrate test
b) Shock pulse meter test
c) Ultrasonic test
d) None
Answer - a) Non destruction dye-penetrate test
115. The gap between two halves of axle pulley to be maintained is [ a ]
a) 3.0mm+/- 0.5mm
b)6mm +/- 0.5mm
c)4mm +/-0.5mm
d) None
Answer - a) 3.0mm+/- 0.5mm
116. Before lifting coach body, the following electrical items as to be removed, otherwise coach body will not separate from trolley
a) Belt tensioning mechanism
b) V Belts
c) Alternator cables
d) All the above
Answer - a) Belt tensioning mechanism
117. Rating of AC fuses to be provided in 25kw MA type RR unit [ b ]
a) 125A HRC
b) 160A HRC
c)Either a or b
d)None
Answer - b) 160A HRC
118. The rating of filed fuse to be provided in 4.5kw 110v HMTD MA type RRU [ a ]
a) 6A
b)2A
c)4A
d)None
Answer - a) 6A
119. Field resistance of 25 kw alternator [ a ]
a) 9.75 ohms
b)4.5 ohms
c)10 ohms
d) none
Answer - a) 9.75 ohms
125. Codal life of 120 AH VRLA battery [ b ]
a) 5 yrs
b)4 yrs
c)3 yrs
d) None
Answer - b)4 yrs
126. Codal life of 120 AH Flooded battery [ b ]
a) 5 yrs
b)4 yrs
c)3 yrs
d) None
Answer - b)4 yrs
127. Codal life of Battery charger [ b ]
a) 12 yrs
b)15 yrs
c)25 yrs
d) None
Answer - b)15 yrs
128. Codal life of coach wiring [ b ]
a) 12 yrs
b)15 yrs
c)20 yrs
d) None
Answer - b)15 yrs
No comments:
Post a Comment