Electrical Engineering MCQs

Page No. 267

Blocked rotor test on induction motors is used to find out?


aleakage reactance


bpower factor on short circuit


cshort-circuit current under rated voltage


dall of the above


View Answer all of the above

The complete circle diagram of induetion motor can be drawn with the help of data found from__________?


anoload test


bblocked rotor test


cstator resistance test


d all of the above


View Answer all of the above

In the squirrel-cage induction motor the rotor slots are usually given slight skew__________?


ato reduce the magnetic hum and locking tendency of the rotor


bto increase the tensile strength of the rotor bars


cto ensure easy fabrication


dnone of the above



The torque of a rotor in an induction motor under running condition is maximum__________?


a at the unit value of slip


bat the zero value of slip


c at the value of the slip which makes rotor reactance per phase equal to the resistance per phase


dat the value of the slip which makes the rotor reactance half of the rotor



What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero ?


aThe slip of the motor will be 5%


bThe rotor will not run


cThe rotor will run at very high speed


dThe torque produced will be very large



The stating torque of the slip ring induction motor can be increased by adding__________?


aexternal inductance to the rotor


bexternal resistance to the rotor


cexternal capacitance to the rotor


dboth resistance and inductance to rotor



A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be__________?


a 0.01


b0.02


c0.03


d0.04


View Answer 0.04

The power scale of circle diagram of an induction motor can be found from__________?


astator resistance test


bno-load test only


cshort-circuit test only


dnoue of the above



A change of 4% of supply voltage to an induction motor will produce a change of approximately ________?


a4% in the rotor torque


b8% in the rotor torque


c12% in the rotor torque


d16% in the rotor torque



The shape of the torque/slip curve of induction motor is__________?


aparabola


b hyperbola


crectangular parabola


d straigth line


View Answer rectangular parabola

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