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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 magnetization
 demagnetization
 cross magnetization

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  250 V.
 about 100 V.
  zero.
  very small, say about 2 or 3 V.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Differential compound motors.
 Series motors.
 Shunt motors.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 high slip region
 both 1 and 2
 unity slip

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 electromechanical energy conversion.
 generation of voltage.
 development of torque.
 commutation.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 10 ohm
 0.2 ohm
 2 ohm.

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