Electrical Engineering MCQs

Page No. 296

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


aBlowers


bConveyors


cAir compressors


dCentrifugal pumps


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


bFaraday’s law


cColoumb’s law


dFleming’s left-hand rule



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


aSlip rings


bCommutator


cField winding


dArmature winding


View Answer Field winding

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


aseries motors


b shunt motors


ccompound motors


dnone of the above


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%


baround 90%


canywhere between 75% and 90%


dless than 50%


View Answer less than 50%

A three point starter is considered suitable for______________?


ashunt motors


bshunt as well as compound motors


cshunt, compound and series motors


d all D.C. motors



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


ato improve cooling


bto reduce copper losses


cto increase the generated e.m.f.


dto reduce the sparking



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


aStarter for a car


bDrive for a water pump


cFan motor


dMotor operation in A.C. or D.C


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


b Shaft


c Commutator


dStator


View Answer Commutator

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


apumping sets


bair compressors


c electric traction


dmachine shops


View Answer electric traction

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