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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  all of below.
  less maintenance.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / V2

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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

 5%
 25%
 2%
 4%

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 50 V.
 399 V.
  230.2 V.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
  none of above.
  cross-magnetization as well as demagnetization.
 demagnetisation.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

All of these
 supply voltage control
 armature circuit resistance control
 field current control

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