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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 0.08
 -0.08
 -1.92

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T is independent of P
 T∝ P²
 T∝ P

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 decreased.
  remains unchanged.
 kept constant to certain value.
 increased.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Naphtha based insulating oil.
 Aromatics based insulating oil.
 Olefin based insulating oil.
  Paraffin based insulating oil.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
 minimum
All of these

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same voltage magnitude
 same phase sequence
 same prime mover speed
 same frequency

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