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Q#1 Induction Machines GATE EE 2008 MCQ +2 marks -0.66 marks

A 3-phase, 440 V, 50 Hz, 4-pole, slip ring induction motor is fed from the rotor side through an autotransformer and the stator is connected to a variable resistance as shown in the figure.

The motor is coupled to a 220V, separately excited, dc generator feeding power to fixed resistance of10Ω. Two-wattmeter method is used to measure the input power to induction motor. The variable resistance is adjusted such that the motor runs at 1410 rpm and the following readings were recorded:

,

The speed of rotation of stator magnetic field with respect to rotor structure will be

90 rpm in the direction of rotation

90 rpm in the opposite direction of rotation

1500 rpm in the direction of rotation

1500 rpm in the opposite direction of rotation

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Network Analysis 260 0 0
Signals and Systems 165 0 0
Control Systems 258 0 0
Analog Electronics 184 0 0
Digital Electronics 148 0 0
Electrical Machines 392 0 0
Power Electronics 237 0 0
Power Systems 344 0 0
EMFT EE 107 0 0
Measurement 158 0 0
Engineering Mathematics 225 0 0
General Aptitude 211 0 0