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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EIa.
  EbIa.
  EbIa2.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 7%.
  8.9%.
 14%.
 0%.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ 1/(φf)
 E ∝ f/φ
 E ∝ φ/f
 E ∝ φf

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Shaft torque.
 Rotor speed.
 Synchronous speed.
  Core loss component.

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC Shunt motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 1 V
 4 V

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