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# GATE 2024 Electrical Machines Rank Booster Quiz 14

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Question 1

Choose the most appropriate option regarding to the power factor control of induction motor. (Fig.)

Question 2

A single-phase, 4-pole induction motor takes a line current of 60∠–70° A at stand still with its main winding excited from 230V, 50 Hz source. Neglect stator impedance, magnetizing current and rotational loss. Calculate stator current. (slip = 5%)

Question 3Multiple Correct Options

Choose the correct option(s) related to single phase hysteresis motor:

Question 4

The slip at which maximum power developed for 3 phase induction motor, it 120V, 60HZ, 6 pole. (Δ) 3 phase IM has stator impedance = 0.1 + j0.15 Ω/phase

Rotor impedance = 0.2 + j0.25 Ω/phase (at stand still).

Question 5

What will be the efficiency of a three phase, 400V induction motor running on load with 4% slip and taking 50A at a power factor of 0.86. When running light at 400V, the motor takes an input current of 15A and power of 2000 W, of which 650W represents the friction, windage and rotor copper loss. The resistance per phase of the stator winding (delta connected) is 0.5 Ω.

Question 6

A single-phase, 230 V, 50 Hz, 4-pole, capacitor-start Induction motor has the following standstill impedances.

Main winding, Zm = 8.0 + j12.0 Ω

Auxiliary winding, Za = 16 + j4.0 Ω

The value of the starting capacitor required to produce 80o phase difference between the currents in main and auxiliary windings will be

Question 7

Using the inverted v-curve for synchronous motor, if excitation is increased (keeping prime mover input constant) The power angle ____ (currently motor at 0.8PF lead)
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