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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 sine wave.
  pulsed wave.
 triangular wave.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
 0.3.
  0.54.
 0.7.

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator copper loss
All of these
 Rotational loss
 Stator core loss

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 crawling.
 cogging.
 locking.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 current.
 torque.
 speed.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
 100 W, 2000 W.
  3190 W, 5040 W.
 1000 W, 5040 W.

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