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Test: Electrical Machines- 5 - Question 1

A 1000 hp, 4 pole, 3 phase, 440 V, 50 Hz, Induction motor has a speed of 1440 rpm on full load. The number of cycles of the rotor voltage makes per minutes will be______

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Test: Electrical Machines- 5 - Question 2

Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when the

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Test: Electrical Machines- 5 - Question 3

The rotor winding of a 6 pole, 3 phase, slip-ring induction motor receive a 3-phase, 50 Hz supply produced an air gap mmf rotating in the clock wise direction with respect to the rotor the rotor itself is being rotated in the anticlockwise direction at 400 rpm. Frequency of the voltages induced in the stator phases is _______ Hz

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Test: Electrical Machines- 5 - Question 4

A 6 – pole, 3 phase induction motor is drawing current from a 50Hz supply. If the rotor is running at a speed of 970 rpm, what is the speed of rotor magnetic field with respect to rotor?

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Test: Electrical Machines- 5 - Question 5

The ratio of starting to full load current for a 15 kW, 300 V and 3ϕ induction motor with DOL starter is _________. For 3 phase inductor motor has full load efficiency 0.90 the full load PF is 0.8 and short-circuit current is 30A at 100V.

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Test: Electrical Machines- 5 - Question 6

A 208 V, 8 pole 60 Hz three phase star connected wound rotor induction motor has a rotor impedance of 0.02 + 0.08 Ω/phase and negligible stator impedance at standstill. Consider the following statements.

1. The breakdown slip at which maximum torque occurs is 0.25

2. The starting torque is 47% of the maximum torque

3. The maximum torque developed by the motor is 1364.4 Nm

Q. Which of the above statements is/are correct?

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Test: Electrical Machines- 5 - Question 7

A 2 pole, 50 Hz induction motor supplies 15 kW to a load at a speed of 2950 rotation/min. How much power (In kW) will be supplied by the motor when the torque is doubled.

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Test: Electrical Machines- 5 - Question 8

A 50 H.P, 4 pole, 50 Hz 3ϕ SRIM runs at 1440 RPM on full load with rotor current per phase of 30A. If it allows 1000 W for the mechanical loss then find the resistance per phase of the 3ϕ rotor winding.

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Test: Electrical Machines- 5 - Question 9

A 3 ϕ squirrel cage induction motor has full load slip of 5% and starting current of 5 times the full load current. Neglect the stator and copper losses as well as the rotational losses. then the slip at which maximum torque occurs will be____. Assume the stator impedance is negligible

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Test: Electrical Machines- 5 - Question 10

The rotor resistance and standard reactance of a 3 phase induction motor are respectively 0.015 Ω and 0.09 Ω per phase. At normal voltage the full load slip is 3 %. Find the percentage reduction in stator voltage to develop full load torque at half full load speed.

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