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Electrical Machines

Electrical Machines
Induction motors have the advantage of

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

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 940 RPM
 920 RPM
 960 RPM

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 0.08
 -1.92
 1.92

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed falls.
 improve and the speed falls.
 improve and the speed rises.
 deteriorate and the speed rises.

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Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 sine wave.
 square wave.
 triangular wave.

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

 both A and B
 constant loss
 variable loss
None of these

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