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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 0 Hz
 50 Hz
 25 Hz

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 any of the above
 no load
 full load

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  DC motor torque.
  synchronous motor torque.
  induction generator torque.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque.
 Starting torque, operating speed, full load current.
 Operating speed.
  Full load current.

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V – IaRa.
  E = V + IaRa.
 E = V + Ia.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 equal to that of the effective length of the line.
 greater than that of turbo alternator.
 greater than that of hydro generator.
  none of these.

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MORE MCQ ON Electrical Machines

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