Synchronous Generator MCQs Part 9

Synchronous Generator MCQs Part 9

When the speed of alternator is reduced by half, the generated EMF will become

When the speed of alternator is reduced by half, the generated EMF will become

  1. One-fourth
  2. Half
  3. Twice
  4. Four times

Correct answer: 2. Half

The primary reason for placing field winding on the rotor in an alternator

The primary reason for placing field winding on the rotor in an alternator:

  1. Large current in stator
  2. Large power in stator
  3. Small power in the field circuit
  4. Insulation of high voltages is easier on stator than on rotor

Correct answer: 4. Insulation of high voltages is easier on stator than on rotor

In an alternator, the reactance EMF

In an alternator, the reactance EMF:

  1. Is in phase with current
  2. Leads the current by 90°
  3. Lags behind current by 90°
  4. None of the above

Correct answer: 2. Leads the current by 90°

For a 4-pole machine, 1 mechanical degree corresponds to how many electrical degrees

For a 4-pole machine, 1 mechanical degree corresponds to how many electrical degrees

  1. 2
  2. 4
  3. 8
  4. None of these

Correct answer: 1. 2

Low-speed alternators are driven using

Low-speed alternators are driven using

  1. Steam engines
  2. Steam turbines
  3. Hydraulic turbines
  4. None of these

Correct answer: 3. Hydraulic turbines

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