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GATE EE 2021 : Electrical Machines Quiz 4 (App update required to attempt this test)

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Question 1

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

Question 2

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

Question 3

A 220 V, 50 Hz, 6 – pole single phase induction motor is running at a speed of 940 rpm in clockwise (forward) direction. If the rotor resistance at standstill is 5Ω. Calculate the effective rotor resistance(in Ohm) in the backward branch of the equivalent circuit.

Question 4

A 500 W, 230 V, 50 Hz capacitor start motor has the following impedances of the main winding and auxiliary winding (at starting)

If a capacitance of 180 micro farad is added in auxiliary winding, then phase angle between main and the auxiliary winding current is ____________(in degrees).

Question 5

A 230V, 50Hz, 4-pole single-phase induction motor has input current = 8-62°A, developed power = 520 W, Total losses= 40W. For a slip of 0.02 pu, determine the efficiency in percentage.

Question 6

A induction motor has double-cage rotor with equivalent impedance at stand-still of (1+j1) and (0.2+4) ohms. Find the relative values of torque produced by each cage at 5% slip. ie Find ratio of T1:T2
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Oct 7ESE & GATE EE