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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
None of these
 variable loss
 both A and B

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
  hum.
 zoom.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and high
 low and low
 high and high

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
None of these
 Zero
 Slip speed

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 0 Hz
 1 Hz

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 1450W
 1820W
 2000W

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