Synchronous Generator MCQs Part 9
Contents
- 1 When the speed of alternator is reduced by half, the generated EMF will become
- 2 The primary reason for placing field winding on the rotor in an alternator
- 3 In an alternator, the reactance EMF
- 4 For a 4-pole machine, 1 mechanical degree corresponds to how many electrical degrees
- 5 Low-speed alternators are driven using
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
- One-fourth
- Half
- Twice
- 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:
- Large current in stator
- Large power in stator
- Small power in the field circuit
- 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:
- Is in phase with current
- Leads the current by 90°
- Lags behind current by 90°
- 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
- 2
- 4
- 8
- None of these
Correct answer: 1. 2
Low-speed alternators are driven using
Low-speed alternators are driven using
- Steam engines
- Steam turbines
- Hydraulic turbines
- None of these
Correct answer: 3. Hydraulic turbines