Electrical Engineering MCQs

Page No. 47

Vacuum is created by which of the following ?


aVacuum pump


bEjector


c Any of the above


dNone of the above


View Answer Any of the above

_______________method can bring the locomotive to dead stop?


aPlugging braking


b Rheostatic braking


cRegenerative braking


d None of the above


View Answer Plugging braking

The voltage used for suburban trains in D.C. system is usually_______________?


a12 V


b 24 V


c 220 V


d600 to 750 V


View Answer 600 to 750 V

Specific energy consumption becomes________________?


amore on steeper gradient


b more with high train resistance


cless if distance between stops is more


dall of the above


View Answer all of the above

The value of co-efficient of adhesion will be high when rails are_________________?


agreased


bwet


csprayed with oil


dcleaned with sand


View Answer cleaned with sand

For three-phase induction motors which of the following is the least efficient method of speed control ?


aCascade control


bPole changing


c Rheostat control


dCombination of cascade and pole changing


View Answer Rheostat control

In main line service as compared to urban and suburban service______________?


adistance between the stops is more


bmaximum speed reached is high


cacceleration and retardation rates are low


d all of the above


View Answer all of the above

Which of the following is the disadvantage of electric traction over other systems of traction ?


aCorrosion problems in the under-ground pipe work


bShort time power failure interrupts traffic for hours


c High capital outlay in fixed installations beside route limitation


d Interference with communication lines



Quadrilateral speed-time curve pertains to which of the following services ?


aMain line service


bUrban service


cSub-urban service


dUrban and sub-urban service



Co-efficient of adhesion is________________-?


a high in case of D.C. traction than in the case of AC. traction


b low in case of D.C. traction than in the case of AC. traction


cequal in both AC. and D.C. traction


dany of the above


View Answer any of the above

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