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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 shaft torque of a dc motor is less than the electromagnetic torque because of

  ohmic losses.
  mechanical losses.
  hysteresis losses.
  eddy current losses.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
  0.23Ω.
 0.25Ω.
 1Ω.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T2 ∝ P3.
 T ∝ √P.
 T is independent of P.
 T ∝ P.

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Electrical Machines
Which of the following generators are used in arc welding?

 shunt generators
 differential compound generators
 cumulative compound generators
 series generators

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 both 2 and 3.
 hysteresis loss.
 copper loss.

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