Electrical Engineering MCQs

Page No. 265

Slip ring motor is preferred over squirrel cage induction motor where___________?


ahigh starting torque is required


b load torque is heavy


cheavy pull out torque is required


dall of the above



Reduced voltage starter can be used with_____________?


aslip ring motor only but not with squirrel cage induction motor


bsquirrel cage induction motor only but not with slip ring motor


csquirrel cage as well as slip ring induction motor


dnone of the above



A squirrel cage induction motor is not selected when___________?


ainitial cost is the main consideration


bmaintenance cost is to be kept low


chigher starting torque is the main consideration


dall above considerations are involved



Less maintenance troubles are experienced in case of___________?


aslip ring induction motor


bsquirrel cage induction motor


cboth A. and (b)


dnone of the above



In a squirrel cage motor the induced e.m.f. is___________?


adependent on the shaft loading


bdependent on the number of slots


c slip times the stand still e.m.f. induced in the rotor


dnone of the above



The purpose of using short-circuit gear is___________?


ato short circuit the rotor at slip rings


b to short circuit the starting resistances in the starter


cto short circuit the stator phase of motor to form star


dnone of the above



Temperature of the stator winding of a three phase induction motor is obtained by___________?


aresistance rise method


b thermometer method


cembedded temperature method


d all above methods


View Answer all above methods

For driving high inertia loads best type of induction motor suggested is_____________?


aslip ring type


bsquirrel cage type


cany of the above


dnone of the above


View Answer slip ring type

Insertion of resistance in the rotor of an induction motor to develop a given torque?


adecreases the rotor current


bincreases the rotor current


crotor current becomes zero


drotor current rernains same



Insertion of reactance in the rotor circuit_______?


areduces starting torque as well as maximum torque


b increases starting torque as well as maximum torque


cincreases starting torque but maxi-mum torque remains unchanged


d increases starting torque but maxi-mum torque decreases



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