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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/(1-S)
 1-S
 S

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Electrical Machines
A DC compound motor has

 only shunt field winding.
 both shunt and series field winding.
 tertiary winding.
 only series field winding.

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 all of above.
 provide protection against Low-Voltage.
 provide overload protection.

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  250 / 250 V DC.

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC series generator.
 None of these.
 DC shunt generator.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 remains constant.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.

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