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
- 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