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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?

 1470 rpm
 30 rpm
 1500 rpm
 zero

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Electrical Machines
Generator works on the principle of production

 static induced emf.
None of these
 dynamically induced emf.
 both A and B.

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Electrical Machines
Which of the following pairs is/are correct?

 open slot----- leakage flux is less
All of these
 semi closed slot-----leakage flux is moderate
 closed slot----- leakage flux is high

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 unity
 0.9 lag
 0.2 lag

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 220 V.
 240 V.
 280 V.
 150 V.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 0.96
 0.04, 1.96
 0.02, 0.98

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