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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  less maintenance.
  all of below.

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Electrical Machines
In DC machines shape of net flux density is?

 peaky in nature
 sine wave
 saddle shape
 flat tapped or trapezoidal

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

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

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.
 reduce eddy current loss only.
 increase the permeability.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Slip speed
 Zero
 Synchronous speed
None of these

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

  40 A.
 400 A.
 44 A.
 440 A.

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