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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

 400 A.
 440 A.
 44 A.
 40 A.

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

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

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Oscillate around the normal speed.
 Reduce.
 Increase.
 Remain unaltered.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Shunt field resistance control.
 Armature voltage control.
 Any of above.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 leading power factor
 unity power factor
All of these
 lagging power factor

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  Can be determined.
  30 Hz.
 20 Hz.
 35 Hz.

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