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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  triangular.
  pulsating.
  rectangular.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 350 V.
 400 V.
 480 V.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 4 time the initial value
 1/2 of the initial value
 twice the initial value

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

  Core loss component.
 Rotor speed.
 Shaft torque.
 Synchronous speed.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 excitation
 both 1and 2
 load angle

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

  1 at 90°C.
 0.5 at 90°C.
 2 at 90°C.
 3 at 90°C.

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