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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
 MNA
None of these
 GNA

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/√3
 1/√3, 1/3
 1/3, 1/√3
 1/3, 1/3

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Electrical Machines
The inertia constant H of a synchronous condenser is

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

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 36 W.
 30 W.
 25 W.

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Electrical Machines
Which of these types of motor is used in elevators?

 DC shunt motor.
 None of these.
 DC compound motor.
 DC series motor.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 4.76%.
 3.76%.
 2.56 %.

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