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ELECTRICAL MACHINES

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1470 rpm
 zero
 1500 rpm

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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
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 copper loss
 both A and B
 iron loss

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Nr
 S.Ns
 Zero

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Resistance split phase
 Capacitor run

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