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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?

 2 V
 0 V
 4 V
 1 V

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Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
 Conservator tank.
 Radiator.
  Commutator.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.
  Torque increase and speed decrease.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 normal speed.
 synchronous speed.
 slip speed.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
 greater than that of hydro generator.
 equal to that of the effective length of the line.
  none of these.

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