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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
 Tap changer.
 Conservator tank.
  Commutator.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 -3%
 +3.33%
 -3.33%

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 sine wave
 peaky in nature
 flat tapped or trapezoidal

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

 maximum
All of these
 zero
 minimum

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Electrical Machines
Which of these types of motor is used in elevators?

 DC series motor.
 DC compound motor.
 None of these.
 DC shunt motor.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

  150.
 170.
 160.
 180.

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