Electrical Engineering MCQs

Page No. 254

A repulsion motor is equipped with__________?


aslip rings


bcommutator


c both A. and (b)


dnone of the above


View Answer commutator

Which of the following motors has two separate windings on the motor ?


a Repulsion motor


bRepulsion induction motor


cRepulsion start induction run motor


dNone of the above



Which of the following statements regarding a reluctance motor is incorrect ?


aIt cannot be reversed, ordinarily


b It requires no D.C. field excitation for its operation


cIt is nothing else but a single-phase, salient pole synchronous-induction motor


dIts squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor



A shaded pole motor does not possess___________?


acentrifugal switch


b capacitor


ccommutator


dall of the above


View Answer all of the above

To reverse the direction of rotation of acapacitor start motor while it is running we should___________?


adisconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding


b disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding


creverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply


dreverse the direction of connections of the auxiliary winding and immediately connect it to supply



In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?


abecome unstable


b draw excessive armature current and may burn out


cfall out of synchronism and come to stand still


drun as induction motor



Most of the fractional horsepower motors have either___________?


ahard and annealed bearings


b ball or roller bearings


c soft and porous bearings


d plain or sleeve bearings



In a universal motor, the most common cause of brush sparking is___________?


a open armature winding


bshorted armature winding


cshorted field winding”


dall of the above


View Answer all of the above

Which of the following statements regarding reluctance-start motor is incorrect ?


aIt is similar to reluctance motor


bIt is basically an induction motor and not a synchronous one


cSo far as its basic working principle is concerned, it is similar to shaded pole motor


d the air-gap between rotor and salient poles is non- uniform



If starting winding of a single-phase induction motor is left in the circuit, it will____________?


arun faster


bspark at light loads


cdraw excessive current and overheat


d run slower



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