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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 1/S
 S
 1/(1-S)

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.6.
  1.
 0.8.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 inversely.
 has no relation.
 none of these.
 directly.

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

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine A
 any of the two machines
 machine B
 none of these

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial.
 longitudinal.
 none of these.
 radial as well as longitudinal.

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