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RVUNL EE Electrical Machines Quiz 3

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Question 1

A 3-phase induction motor is running in opposite direction to the rotating field. Determine the slip of the motor.

Question 2

In which of the following motors rotor resistance speed control is used?

Question 3

A 3-phase, 4-pole, 50 Hz, induction motor has a rotor impedance of (0.04 + j1.8) Ω. Neglect stator impedance. The value of external resistance connected in rotor terminal, so that starting torque is 40 % of the maximum torque.

Question 4

For a 1.8^o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is

Question 5

A 3 stack stepper motor with 12 numbers of rotor teeth has a step angle of ____________.

Question 6

The parameter of an equivalent circuit of a three-phase induction motor affected by reducing the rms value of the supply voltage at the rated frequency is

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AE & JE Exams

May 17AE & JE Exams