Monday, 18 March 2019

Electrical Engineering Interview Questions And Answers ebook

Electrical Engineering Interview Questions And Answers ebook





1. The vafcie of transformation ratio of an induction motor can be found by

(a) open-circuit test only

(b) short-circuit test only

(c) stator resistance test

(d) none of the above


Ans: b






2. The power scale of circle diagram of an induction motor can be found from

(a) stator resistance test

(6) no-load test only

(c) short-circuit test only

(d) noue of the above


Ans: c





3. The shape of the torque/slip curve of induction motor is

(a) parabola

(b) hyperbola

(c) rectangular parabola

(d) straigth line


Ans: c






4. A change of 4% of supply voltage to an induction motor will produce a change

of appromimately

(a) 4% in the rotor torque

(b) 8% in the rotor torque

(c) 12% in the rotor torque

(d) 16% in the rotor torque


Ans: d






5. The stating torque of the slip ring induction motor can be increased by adding

(a) external inductance to the rotor

(b) external resistance to the rotor

(c) external capacitance to the rotor

(d) both resistance and inductance to rotor


Ans: b




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