Electrical Engineering MCQs

Page No. 47

Vacuum is created by which of the following ?


aVacuum pump

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bEjector

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c Any of the above

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dNone of the above

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View Answer Any of the above

_______________method can bring the locomotive to dead stop?


aPlugging braking

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b Rheostatic braking

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cRegenerative braking

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d None of the above

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View Answer Plugging braking

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


a12 V

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b 24 V

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c 220 V

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d600 to 750 V

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View Answer 600 to 750 V

Specific energy consumption becomes________________?


amore on steeper gradient

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b more with high train resistance

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cless if distance between stops is more

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dall of the above

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View Answer all of the above

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


agreased

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bwet

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csprayed with oil

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dcleaned with sand

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View Answer cleaned with sand

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


aCascade control

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bPole changing

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c Rheostat control

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dCombination of cascade and pole changing

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View Answer Rheostat control

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


adistance between the stops is more

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bmaximum speed reached is high

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cacceleration and retardation rates are low

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d all of the above

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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

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bShort time power failure interrupts traffic for hours

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c High capital outlay in fixed installations beside route limitation

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d Interference with communication lines

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


aMain line service

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bUrban service

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cSub-urban service

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dUrban and sub-urban service

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Co-efficient of adhesion is________________-?


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

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

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cequal in both AC. and D.C. traction

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dany of the above

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View Answer any of the above

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