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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 armature current (I)
 speed
 flux (φ)

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Electrical Machines
The armature of DC motor is laminated

 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the hysteresis loss.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 has no relation.
 inversely.
 none of these.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
  remains constant.
  increases upto a limit and then remains almost constant.
 increases.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 234.76 N-m.
 cant be determined.
 266.20 N-m.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 less than 90°
 90°
 Greater than 90°
 0°

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