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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  220 V.
  zero.

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Electrical Machines
Armature resistance control method is also called as-----------?

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

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  pulsating.
  sinusoidal.
  rectangular.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = 1.
  E1 / E2 = N1 / N2.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 increase.
 decrease.
 None of above.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running current.
  ratio of starting to running torque.
  efficiency.
  ratio of input to output voltage.

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MORE MCQ ON Electrical Machines

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