Synchronous Generator MCQs Part 9

Synchronous Generator MCQs Part 9

Contents

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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