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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 low and low
 low and high
 high and low

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 reduction in generated emf.
 open circuit.
 short circuit.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.
 Commutating pole winding.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Remains same.
  Decrease.
 Increase.
 None of these.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 3.1 Ω
 1.79 Ω
 1.8 9 Ω
 2 .1 Ω

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Electrical Machines
The armature MMF waveform of a DC machine is

  pulsating.
  rectangular.
  sinusoidal.
  triangular.

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MORE MCQ ON Electrical Machines

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