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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 4 V
 1 V
 2 V

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  60 Hz.
  50 Hz.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 torque.
 current.
 power.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 zero
 more than 6 V
 6 V

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 constant independent of speed.
  proportional to rotor speed.
 proportional to square of rotor speed.
 zero.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 f²
 V²
 f

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