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Electrical Machines

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

 440 A.
 400 A.
 44 A.
  40 A.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 copper losses.
 core losses.
 stray losses.

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

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

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
 Blowers.
 Air compressors.
  Conveyers.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 88.8%.
 59.2%.
 57.1%.

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Electrical Machines
Hunting phenomenon is observed in which motor?

 DC motor.
 Induction motor.
 Both A and C.
  Synchronous motor.

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