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Electrical Machines

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

 0 Hz
 50 Hz
 5 Hz
 1 Hz

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 20 V.
 40 V.
 0 V.
 60 V.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 1 : 1.
 N12 : N22.
 none.

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce armature reaction.
 reduce iron weight.
 reduce pulsation loss.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
 over commutation.
  too rapid reversal of current.
  any of the above.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 core loss only
 windage and friction loss
 Copper loss

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