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# ESE 2021 Technical Quiz || Fractional Kilowatt Motors, 1-Phase motors

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Question 1

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 isQuestion 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 induction motor has double-cage rotor with equivalent impedance at stand-still of (1+

*j*1) and (0.2+*j*4) ohms. Find the relative values of torque produced by each cage at 5% slip. ie Find ratio of T1:T2Question 5

The speed of universal motor is generally reduced by

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Jun 4ESE & GATE EE

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