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Electrical Machines

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

 440 A.
  40 A.
 44 A.
 400 A.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 both 1 and 2
None of these
 excitation power only
 power due to saliency or reluctance only

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
  the rotating stator flux and rotor flux.
  the supply voltage and the back emf.
None of these

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Electrical Machines
Select the motor that should not be started on no load?

 Shunt motor.
  Series motor.
 Brushless DC motor.
 Compound motor.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
  13 HP.
 15 HP.
  10 HP.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 10%
 21%
 41%

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