Electrical Engineering MCQs

Page No. 44

When the load is above _______________ a synchronous motor is found to be more economical?


a2 kW


b20 kW


c 50 kW


d100 kW


View Answer 100 kW

Light duty cranes are used in which of the following ?


aPower houses


bPumping stations


cAutomobile workshops


dAll of the above


View Answer All of the above

Which of the following motors are pre-ferred for overhead travelling cranes ?


aSlow speed motors


b Continuous duty motors


cShort time rated motors


dNone of the above



_______________watt-hours per tonne km is usually the specific energy consumption for suburban services?


a15—20


b50—75


c120—150


d160—200


View Answer 50—75

The rate of acceleration on suburban orurban service is in the range_________________?


a 0.2 to 0.5 km phps


b 1.6 to 4.0 km phps


c5 to 10 km phps


d15 to 25 km phps


View Answer 1.6 to 4.0 km phps

Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?


aReduced current method


bTap changing control of transformer


cSeries parallel operation of motors


dAll of the above



The braking retardation is usually in the range__________________?


a0.15 to 0.30 km phps


b0.30 to 0.6 km phps


c 0.6 to 2.4 km phps


d3 to 5 km phps


View Answer 3 to 5 km phps

The coasting retardation is around_________________?


a0.16 km phps


b1.6 km phps


c16 km phps


d40 km phps


View Answer 0.16 km phps

If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?


a 0.3


b0.26


c0.225


d0.16


View Answer 0.16

Which of the following happens in Kando system ?


aThree phase A.C. is converted into D.C.


b Single phase A.C. is converted into D.C.


cSingle phase supply is converted into three phase system


dNone of the above



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