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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?

 4 V
 1 V
 2 V
 0 V

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Both of above.
 Heavy sparking at brushes.
 Heavy sparking at the first stud of starting resistance steps.
 None of these.

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

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

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KVA.
  Output power at the shaft.
 Power drawn in KW.
 Gross power.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 a finite negative value
 a positive finite value
 ∞

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  of low resistivity.
  lighter in weight.
  easy to cast owing to its low melting point and is easily available.
  cheaper in cost.

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