Synchronous Generator MCQs Part 11
Contents
- 1 The AC armature winding of an alternator is connected in which configuration
- 2 WRT alternator which of following is a disadvantage of a short-pitched coil
- 3 Voltage drop in an alternator when under load is due to
- 4 The prime mover that has normally high rotating speed
- 5 The synchronous reactance of an alternator is generally how many times of armature resistance
The AC armature winding of an alternator is connected in which configuration
The AC armature winding of an alternator is connected in which configuration:
- It is always star-connected
- It is usually delta-connected
- Star-delta connected
- None of these
Correct answer: 1. It is always star-connected
WRT alternator which of following is a disadvantage of a short-pitched coil
WRT alternator which of following is a disadvantage of a short-pitched coil:
- Harmonics are introduced
- Voltage around the coil is reduced
- Waveform becomes non-sinusoidal
- None of these
Correct answer: 2. Voltage around the coil is reduced
Voltage drop in an alternator when under load is due to
Voltage drop in an alternator when under load is due to:
- Armature reaction
- Armature resistance
- Armature reactance
- All of these
Correct answer: 4. All of these
The prime mover that has normally high rotating speed
The prime mover that has normally high rotating speed
- Steam engine
- Hydraulic turbine
- Diesel engine
Correct answer: 1. Steam turbine
The synchronous reactance of an alternator is generally how many times of armature resistance
The synchronous reactance of an alternator is generally how many times of armature resistance
- It is 5 times smaller than armature resistance
- 5 times greater than armature resistance
- 10 to 100 times greater than armature resistance
- None of these
Correct answer: 3. 10 to 100 times greater than armature resistance