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Electrical Machines

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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120 / PN Hz.
  PN / 2 Hz.
 120N / P Hz.
 120P / N Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 lagging power factor.
 leading power factor.
 unity power factor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 economise on the material required for interpoles and their windings
 reduce the saturation in the interpole
 reduce the overall weight
 increase the acceleration of commutation

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
  0.23Ω.
 0.25Ω.
 1Ω.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.6.
  1.
 0.8.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

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