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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  load.
  speed and voltage.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Saddle shape.
 Triangular and directed towards main pole.
 Peaky in nature.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
  60 Hz.
 0.70 Hz.
 0.75 Hz.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cos2δ
 sin2δ
 cosδ

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Insulation requirement is less.
All of these
 Collecting of large current is simple.
 Operating cost is less.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3.33%
 +3%
 -3%

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