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GATE 2020 || Electrical Machines || Quiz 4
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Question 1
Which one is the torque speed curve in case of single phase induction motor? Torque is on y axis and speed is on x axis.
Question 2
A single winding single-phase induction motor has:
Question 3
A 220 V, 50 Hz, 6-pole, single-phase induction motor has the following circuit model.
The rotational losses of the motor are estimated to be 75 W. At a motor speed of 940 rpm, _________ A is the magnitude of line current.
Question 4
A 220 V, 50Hz, 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 5
A 300W, 230 V, 50Hz capacitor start single phase induction motor has main winding impedance (ZM) = (6+j4)Ω and auxiliary winding impedance (ZA. = (8+j3) Ω. Neglecting the magnetizing branch the value of the capacitor (in µF) to be added in auxiliary winding to obtain maximum torque at starting______(fill in the blanks)
Question 6
A induction motor has double-cage rotor with equivalent impedances at stand-still of (1+j1) and (0.2+j4). Find the relative values of torque produced by each cage at 5% slip.
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Oct 3ESE & GATE EE