Electrical Engineering MCQs

Page No. 291

For constant torque drive which speed control method is preferred ?


aField control

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bArmature voltage control

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cShunt armature control

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dMechanical loading system

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Ward-Leonard control is basically a____________?


avoltage control method

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bfield divertor method

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cfield control method

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darmature resistance control method

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Which motor should not be started on no-load ?


aSeries motor

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bShunt motor

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cCumulatively compounded motor

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dDifferentially compounded motor

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View Answer Series motor

Which of the following motors is most suitable for signalling devices and many kinds of timers ?


aD.C. shunt motor

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bD.C. series motor

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cInduction motor

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dReluctance motor

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View Answer Reluctance motor

Which of the following motors is usually used in house-hold refrigerators ?


aD.C. shunt motor

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bD.C. series motor

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cSingle phase induction motor (split phase start or induction run motor)

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dReluctance motor

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Why are the D.C. motors preferred for traction applications ?


aTorque and speed are inversely proportional to armature current

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bTorque is proportional to armature current

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cTorque is proportional to square root of armature current

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dThe speed is inversely proportional to the torque and the torque is proportional to square of armature current

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If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?


aincrease

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bdecrease

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cremain same

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dbecome zero

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View Answer increase

Which of the following motors one will choose to drive the rotary compressor ?


aD.C. shunt motor

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bD.C. series motor

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cUniversal motor

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dSynchronous motor

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View Answer Synchronous motor

If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking?


a regenerative

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bplugging

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cdynamic braking

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dnone of the above

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View Answer plugging

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor_____________?


aof lower H.P. should be selected

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bof higher H.P. should be selected

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ccan be used for 50°C ambient temperature also

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dis to be derated by a factor recommended by manufacturer and select the next higher H.P. motor

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