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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