Electrical Engineering MCQs

Page No. 271

In three-phase squirrel-cage induction motors____________?


arotor conductor ends are short-circuited through slip rings


brotor conductors are short-circuited through end rings


c rotor conductors are kept open


d rotor conductors are connected to insulation



The maximum torque in an induction motor depends on___________?


afrequency


b rotor inductive reactance


csquare of supply voltage


d all of the above


View Answer all of the above

An induction motor is__________?


aself-starting with zero torque


bself-starting with high torque


cself-starting with low torque


dnon-self starting



If any two phases for an induction motor are interchanged_______?


athe motor will run in reverse direction


b the motor will run at reduced speed


cthe motor will not run


dthe motor will not run



Rotor rheostat control method of speed control is used for____________?


asquirrel-cage induction motors only


bslip ring induction motors only


cboth A. and (b)


d none of the above



For which motor the speed can be controlled from rotor side ?


a Squirrel-cage induction motor


bSlip-ring induction motor


cBoth A. and (b)


d None of the above



In the circle diagram for induction motor, the diameter of the circle represents____________?


aslip


brotor current


crunning torque


dline voltage


View Answer rotor current

Stepless speed control of induction motor is possible by which of the following methods ?


ae.m.f. injection in rotor eueuit


bChanging the number of poles


cCascade operation


dNone of the above



When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?


ain series


bin parallel


cin series-parallel


d in parallel with stator


View Answer in parallel

The torque developed in the cage induction motor with autostarter is___________?


ak/torque with direct switching


b K x torque with direct switching


cK2 x torque with direct switching


d k2/torque with direct switching



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