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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 both A and B
 mechanical loss
 copper loss

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 0.5 lagging
 zero
 R = S.X
 unity

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.95
 0.96
 1.06
 0.87

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
  75°.
 30°.
 45°.

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Electrical Machines
The output voltage of a DC generator is

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

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Series motor.
  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Shunt motor.

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