Electrical Engineering MCQs

Page No. 291

For constant torque drive which speed control method is preferred ?


aField control


bArmature voltage control


cShunt armature control


dMechanical loading system



Ward-Leonard control is basically a____________?


avoltage control method


bfield divertor method


cfield control method


darmature resistance control method



Which motor should not be started on no-load ?


aSeries motor


bShunt motor


cCumulatively compounded motor


dDifferentially compounded motor


View Answer Series motor

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


aD.C. shunt motor


bD.C. series motor


cInduction motor


dReluctance motor


View Answer Reluctance motor

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


aD.C. shunt motor


bD.C. series motor


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


dReluctance motor



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


aTorque and speed are inversely proportional to armature current


bTorque is proportional to armature current


cTorque is proportional to square root of armature current


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



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


aincrease


bdecrease


cremain same


dbecome zero


View Answer increase

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


aD.C. shunt motor


bD.C. series motor


cUniversal motor


dSynchronous motor


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


bplugging


cdynamic braking


dnone of the above


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


bof higher H.P. should be selected


ccan be used for 50°C ambient temperature also


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



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