Electrical Engineering MCQs

Page No. 269

A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?


astall after sometime


bstall immediately


ccontinue to run at lower speed without damage


dget heated and subsequently get damaged



Which type of bearing is provided in small induction motors to support the rotor shaft ?


aBall bearings


bCast iron bearings


cBush bearings


dNone of the above


View Answer Ball bearings

The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?


a D.C. series motor


bD.C. shunt motor


cuniversal motor


dnone of the above


View Answer D.C. shunt motor

It is advisable to avoid line starting of induction motor and use starter because____________?


a it will run in reverse direction


b it will pick up very high speed and may go out of step


cmotor takes five to seven times its full load current


dstarting torque is very high



If a 3-phase supply is given to the stator and rotor is short circuited rotor will move___________?


ain the opposite direction as the direction of the rotating field


bin the same direction as the direction of the field


c in any direction depending upon phase squence of supply


dNone of above



As load on an induction motor goes on increasing______________?


aits power factor goes on decreasing


b its power factor remains constant


cits power factor goes on increasing even after full load


d its power factor goes on increasing up to full load and then it falls again



Slip ring motor is recommended where____________?


aspeed control is required


bfrequent starting, stopping and reversing is required


chigh starting torque is needed


dall above features are required



In an induction motor the relationship between stator slots and rotor slots is that_____________?


astator slots are equal to rotor slots


bstator slots are exact multiple of rotor slots


cstator slots are not exact multiple of rotor slots


dnone of the above



Low voltage at motor terminals is due to____________?


ainadequate motor wiring


bpoorely regulated power supply


cany one of the above


dnone of the above


View Answer any one of the above

A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?


awill continue running burning its one phase


bwill continue running burning its two phase


cwill stop and carry heavy current causing permanent damage to its winding


dwill continue running without any harm to the winding



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