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b)

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02000EE216052001

frequency when the slip is 4 % and iv) rotor current at 4%slip if rotor has
resistance and stand still reactance of of 1Q/phase and 4Q/phase respectively.
PART C

Answer any two full questions. Each question carries 20 marks
Sketch & explain the torque —slip characteristics of three phase Induction motors.
Explain the working of (i) Split phase (ii) capacitor start and (iii) capacitor start run
induction motors.
Explain the power flow diagram of an induction motor.
Explain the working of MI instruments.
Calculate the active & reactive powers consumed by the three phase load& the
power factor of it when the two watt meters connected to it gave the following
readings
W [= 1500 W .W 2 = -500 W
How can you distinguish between an
(i) MI and MC meter by looking at the scale of the instrument
(ii) The current coil & pressure coil of a wattmeter just by inspection?
Explain the working of induction Type Energy meter with diagrams.
With neat diagram explain working of shaded pole induction motor.

Compare DC & AC servomotors

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