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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Zero.
 Normal.
 Very high.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 Greater than 90°
 less than 90°
 90°

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature mmf
 armature current
 armature flux
All of these

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 399 V.
 50 V.
  230.2 V.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a finite negative value
 0
 ∞
 a positive finite value

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous motor
 reluctance motor
 hysteresis motor
 3-phase synchronous generator

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