Power System MCQs Part 9
Contents
- 1 For reducing tower footing resistance it is better to employ
- 2 The size of conductor on modern EHV lines is obtained based on
- 3 Which of following is correct regarding a short length of cable between the dead end tower and the power transformer
- 4 Minimum oil circuit breaker has less volume of oil because
- 5 If r is the radius of the conductor and R the radius of the sheath of the cable, the cable operates stably from the view point of dielectric strength if
For reducing tower footing resistance it is better to employ
For reducing tower footing resistance it is better to employ
- Chemical and ground rods only
- Ground rod and counterpoise only
- Chemical and counterpoise only
- Chemical, ground rods and counterpoise
Correct answer: 2. Ground rod and counterpoise only
The size of conductor on modern EHV lines is obtained based on
The size of conductor on modern EHV lines is obtained based on:
- Voltage drop
- Current density
- Corona
- None of these
Correct answer: 3. Corona
Which of following is correct regarding a short length of cable between the dead end tower and the power transformer
Which of following is correct regarding a short length of cable between the dead end tower and the power transformer
- It reduces the steepness of the wave under certain conditions only
- It does not change the steepness
- It always reduces the steepness of the incident wave
Correct answer: 3. It always reduces the steepness of the incident wave
Minimum oil circuit breaker has less volume of oil because
Minimum oil circuit breaker has less volume of oil because
- There is insulation between contacts
- Solid insulation is provided for insulating the contacts from earth
- The oil between the breaker contacts has greater strength
- None of these
Correct answer: 2. Solid insulation is provided for insulating the contacts from the earth
If r is the radius of the conductor and R the radius of the sheath of the cable, the cable operates stably from the view point of dielectric strength if
If r is the radius of the conductor and R the radius of the sheath of the cable, the cable operates stably from the view point of dielectric strength if:
- r/R > 1.0
- r/R < 1.0
- r/R < 0.368
- r/R < 0.667
Correct answer: 3. r/R < 0.368