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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 1.644 KW.
 5.46 KW.
  2.73 KW.

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 2%
 4%
 5%

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 20 V.
 0 V.
 40 V.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 Separately excited DC motor.
 DC series motor.
 DC compound motor.
 DC Shunt motor.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor series regulator.
None of these
  Transistor shunt regulator.

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

  zero.
 positive.
 low.
 negative.

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