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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 AC generator
 DC generator
 DC motor

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 90°
 25° to 30°
 70° to 85°

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 K×R1
 R1 /K²
 K²R1

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 40%
 5%

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f3.
 f2.
  f.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 total value.
  maximum value.
 average value.

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