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

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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)

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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

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bChanging the number of poles

✓


cCascade operation

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dNone of the above

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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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