Electrical Engineering MCQs

Page No. 296

Which of the following load normally needs starting torque more than the rated torque?


aBlowers

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bConveyors

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cAir compressors

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dCentrifugal pumps

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View Answer Conveyors

Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?


aLenz’s law

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bFaraday’s law

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cColoumb’s law

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dFleming’s left-hand rule

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In D.C. motor which of the following can sustain the maximum temperature rise?


aSlip rings

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bCommutator

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cField winding

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dArmature winding

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View Answer Field winding

The ratio of starting torque to full-load torque is least in case of____________?


aseries motors

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b shunt motors

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ccompound motors

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dnone of the above

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View Answer shunt motors

In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?


a100%

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baround 90%

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canywhere between 75% and 90%

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dless than 50%

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View Answer less than 50%

A three point starter is considered suitable for______________?


ashunt motors

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bshunt as well as compound motors

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cshunt, compound and series motors

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d all D.C. motors

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In D.C. machines fractional pitch winding is used__________?


ato improve cooling

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bto reduce copper losses

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cto increase the generated e.m.f.

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dto reduce the sparking

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In which of the following applications D.C. series motor is invariably tried?


aStarter for a car

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bDrive for a water pump

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cFan motor

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dMotor operation in A.C. or D.C

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View Answer Starter for a car

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?


aFrame

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b Shaft

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c Commutator

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dStator

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View Answer Commutator

These days D.C. motors are widely used in____________?


apumping sets

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bair compressors

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c electric traction

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dmachine shops

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View Answer electric traction

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