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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 5 / 6.
 6 / 7.
 2 / 3.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 200.
 750.
 500.
  100.

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Electrical Machines
The power factor of squirrel cage induction motor is

 both A and B
 low at heavy loads only
 low at light loads only
 low at rated load only

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

None of these
 I1 = I2
 I1 > I2
 I1 < I2

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
All of these
 Copper loss
 Iron loss

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