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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 both A and B
None of these
 armature current(Ia)

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 remains unaffected
 decreases
 increases

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Electrical Machines
A DC compound motor has

 only series field winding.
 tertiary winding.
 only shunt field winding.
 both shunt and series field winding.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
 300 V.
 200 V.
  223.V.

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

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

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