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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

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Differntical compound.
  Shunt.
 Series.
 Cummulative compound.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 flat-topped
 co- sinusoidal
 rectangular

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant torque control
 constant voltage control
 constant current control

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  maximum torque.
  electromagnetic torque.
  none.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

None of these
  Transistor shunt regulator.
  Zener diode shunt regulator.
  Transistor series regulator.

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