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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Nr
 S.Ns
 Zero

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pc/Pi
 Pi/Pc
 √(Pi/Pc)
 (Pi/Pc)2

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Electrical Machines
Which of the following statements are correct ?

None of these
 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.74 Ω.
 25.564 Ω.
 2.781 Ω.
  2.241 Ω.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 Compound (cummolative).
  Shunt.
 none of these.

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