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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
None of these
  stator frame.
  pole faces.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

  It is a constant speed motor.
 It is a step angled motor.
 It is a high reluctance motor.
 It is a variable speed motor.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48 Hz
 48.5 Hz
 45 HZ
 50 Hz

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 unity
 R = S.X
 0.5 lagging
 zero

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
  lagging.
 zero.
 leading.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 zero
 50 V
 40 V
 20 V

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