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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 variable loss
None of these
 both A and B
 constant loss

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 320 Amp.
 800 Amp.
  0.5 Amp.
  400 Amp.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 no load voltage and field current
 short circuit current and armature current
 short circuit current and field current

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
 reluctance motor.
 repulsion motor.
  universal motor.

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 cast iron.
 carbon.
 stainless steel.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
 35°C.
  45°C.
 27°C.

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