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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/60.
 PN/3000.
 PN/120.

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Electrical Machines
The shaft of induction motor should be

  hollow.
  stiff.
  any of these.
  flexible.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 slip speed.
 any of the above.
 synchronous speed.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 100 VA
 110 VA

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T ∝ P.
 T2 ∝ P3.
 T is independent of P.

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Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
 lap winding
 wave winding
None of these

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