1) Size of V belts used for 25KW Alternator ( c ) a. C121 b. C123 c. C122 d. C124
2) Capacity of battery fuse in AC Coaches ( a ) a. 315 A & 400 (HRC ) b. 63 A (HRC ) c. 16 A (HRC ) d. 5 A (HRC )
3) The gap between the two halves of axle pulley should be ( c ) a 0.5 – 1.0 mm b. 2.0 – 3.0 mm c. 3.0 – 4.0 mm d. 5.0 – 5.5 mm
4) What are the AH capacity of cells used in all types of AC coaches ( b ) a. 800 Ah Lead Acid & 1100 AhVRLA b. 800 & 1100 Ah Lead Acid &1100 Ah VRLA c. 1100 Ah d. 800 Ah
5) Name the Acid used in lead acid cells ( a ) a. Sulphuric Acid b. Hydrochloric Acid c. Nitric acid d. Phosphoric Acid
6) The Specific gravity & Voltage of fully charged cells are ( a ) a. 1220 & 2.2 b. 1200 & 2.2 c. 1220 & 2.1 d. 1200 & 2.1
7) Cut in speed for brushless alternator in AC application ( b ) a. 21 b. 20 c. 19 d. 18
8) Inverter converts ( a ) a. DC to AC b. DC to DC c. AC to AC d. AC to DC
9) IGBT are used as ( a ) a. High frequency switching device b. Illuminating device c. Low frequency switching device d. Amplifier
10) Boost charge of VRLA cells is ( a ) a. 2.3 V/Cell b. 110 V/Cell c. 2.25 V/Cell d. 115 V/Cell
11) Trickle charging of VRLA cells is ( c ) a. 2.3 V/Cell b. 110 V/Cell c. 2.25 V/Cell d. 115 V/Cell
12) Rectifier converts ( b ) a. DC to AC b. AC to DC c. AC to AC d. DC to DC
13) Give the half load setting of RRU for AC application at 1500 rpm ( a ) a. 97 Amps b. 20 Amps c. 21 Amps d. 22 Amps
14) Required level of Illumination in corridor of 2-Tier AC coach is ( c ) a. 14 Lux b. 22 Lux c. 40 Lux d. 16 Lux
15) Give the minimum tension length of spring used in Tension rod of 25 KW Alternator ( b ) a. 310 mm b 265 mm c. 269 mm d. 275 mm
16) Why lead acid cells are called as secondary cells ( c ) a. Since it can’t be recharge b. Since it can’t charge initially c. Since it can be recharged d. None
17) Name the method to be used to find out Earth leakage ( a ) a. Double test lamp method b. Multi meter method c. Tong tester method d. Volt meter method
18) If alternator is not generating voltage, the reason could be ( d ) a. Field may be open b. Fuse in regulator had blown c. Dropping of V-belts d. All the above
19) The advantage of ERRU is ( d ) a. To obtain pure DC supply b. Inbuilt Over Voltage protection c. Produces over voltage d. Both (a) & (b)
20) The capacity of Regulators used in AC coaches are ( a ) a. 18KW & 25KW b. 4.5KW & 15KW c. 4.5KW & 25KW d. 4.5KW & 18KW
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