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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?

 1500 rpm
 30 rpm
 zero
 1470 rpm

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

None of these
 variable loss
 constant loss
 both A and B

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

 mechanical loss
 iron loss
 both A and B
 copper loss

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

 S.Ns
 Zero
 Nr
 Ns

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

 Resistance split phase
 Shaded pole
 Capacitor run
 Capacitor start

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