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Electrical Engineering Objective Questions { Utilisation of Electrical Energy }

239. watt-hours per tonne km is usually the specific energy consumption for suburban services.
A. 15-20
B. 50-75
C. 120-150
D. 160-200
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240. The braking retardation is usually in the range
A. 0.15 to 0.30 km phps
B. 0.30 to 0.6 km phps
C. 0.6 to 2.4 km phps
D. 3 to 5 km phps
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241. The rate of acceleration on suburban or urban service is in the range
A. 0.2 to 0.5 km phps
B. 1.6 to 4.0 km phps
C. 5 to 10 km phps
D. 15 to 25 km phps
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242. The coasting retardation is around
A. 0.16 km phps
B. 1.6 km phps
C. 16 km phps
D. 40 lun phps
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243. Which of the following track is electrified
A. Delhi-Bombay
B. Delhi-Madras
C. Delhi-Howrah
D. Delhi-Ahmedabad
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244.  is the method of braking in which motor armature remains connected to the supply and draws power from it producing torque opposite to the direction of motion.
A. Rheostatic braking
B. Regerative braking Plugging
C. All the above
D. none of above
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245. For 600 V D.C. line for tramcars, track in connected to
A. positive of the supply
B. negative of the supply
C. mid voltage of 300 V
D. none of the abcve
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