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Electrical Machines

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

 440 A.
 400 A.
 44 A.
 40 A.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at lower speed.
 Run at normal speed.
  Burn.
 Not run.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Hysteresis losses
 Friction and windage losses
 Eddy current losses

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 240 A.
  190 A.
 173 A.
 127 A.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited
 lightly loaded and underecited

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 65 V
 230 V
 115 V

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