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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  aluminium.
  carbon.
  stainless steel.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 Greater than 1.
 0.25.
 0.5.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Any of above.
 Armature circuit resistance control.
 Field resistance control.
 Armature voltage control.

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
 Star side lags by -30°.
  Delta side lags by -30°.
 Star side leads by 30°.

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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

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

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.06 Ω.
  0.54 Ω.
 0.54 Ω.
 0.01 Ω.

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