Electrical Engineering MCQs

Page No. 42

A reluctance motor_________________?


ais provided with slip rings

✖


brequires starting gear

✖


chas high cost

✖


dis compact

✓


View Answer is compact

___________________is preferred for synthetic fibre mills?


aSynchronous motor

✖


bReluctance motor

✓


cSeries motor

✖


dShunt motor

✖


View Answer Reluctance motor

Which of the following motors is used for elevators ?


aInduction motor

✓


bSynchronous motor

✖


cCapacitor start single phase motor

✖


dAny of the above

✖


View Answer induction motor

________________ motor is a constant speed motor?


a Synchronous motor

✓


bSchrage motor

✖


cInduction motor

✖


dUniversal motor

✖


View Answer Synchronous motor

The starting torque of a D.C. motor is independent of which of the following?


aflux density

✖


bArmature current

✖


cFlux and armature current

✖


dSpeed

✓


View Answer Speed

need frequent starting and stopping of electric motors ?


aPaper mills

✖


bGrinding mills

✖


cAir-conditioners

✖


dLifts and hoists

✓


View Answer Lifts and hoists

Which of the following motors are best for the rolling mills ?


aSingle phase motors

✖


bSquirrel cage induction motors

✖


cSlip ring induction motors

✖


dD.C. motors

✓


View Answer D.C. motors

For which of the following applications D.C. motors are still preferred ?


aHigh efficiency operation

✖


bReversibility

✖


cVariable speed drive

✓


dHigh starting torque

✖


View Answer Variable speed drive

___________________is not a part of ball bearing ?


a Inner race

✖


bOuter race

✖


cCage

✖


dBush

✓


View Answer Bush

The starting torque in case of centrifugal pumps is generally_________________?


a less than running torque

✓


bsame as running torque

✖


cslightly more than running torque

✖


d double the running torque

✖



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