High Voltage Engineering MCQs Part 3
- The relative dielectric strength of SF6 as compared to air is:
- 1.5 times
- 2 times
- 2.5 times
- 3 times
- Correct answer: 2.5 times
- The correct statement about Paschen’s law states that breakdown voltage of a uniform gap is directly proportional to:
- Pressure of the gas
- Separation of electrode
- Material of electrode
- All of these
- 1 & 3
- Correct answer: 4. All of these
- For determining intrinsic strength of dielectric the applied voltage should be of the order of:
- 10-8 sec
- 10-16 sec
- 10-24 sec
- 10-32 sec
- Correct answer: 1. 10-8 sec
- The ratio of voltage drop in a 6 stage to 3 stage Cockroft Walton circuit is:
- 6
- 2
- 9
- 1
- Sometimes a void appears in the dielectric, the correct statement regarding the void is that its:
- Electric field strength is lower than that of the dielectric
- Electric field strength is higher than that of the dielectric
- Electric field strength is exactly similar to the dielectric
- Correct answer: 2. Electric field strength is lower than that of the dielectric
- The onset voltage for Trichel pulses:
- Increases exponentially with increase in gap length
- Increases exponentially with decrease in gap length
- Increases directly with increase in gap length
- Is independent of gap length
- Correct answer: 4. Is independent of gap length
- The frequency response of Rogowski coil is flat upto:
- 100 MHz
- 200 MHz
- 500 MHz
- 1000 MHz
- Current answer: 1. 100 MHz
- The small load current in Cockroft – Walton circuit means:
- Voltage drop is very large
- Voltage drop is small
- None of these
- Can’t predict
- Current answer: 2. Voltage drop is small
- The dielectric strength of liquids is of the order:
- 100 kV/cm
- 1000 kV/cm
- 5000 kV/cm
- 10000 kV/cm
- Current answer: 1. 100 kV/cm
- Temperature limit for Class H insulation is:
- 90°C
- 180°C
- 200°C
- 400°C
- Correct answer: 2. 180°C
Continue reading:
- High Voltage Engineering MCQs Part 1
- High Voltage Engineering MCQs Part 2
- High Voltage Engineering MCQs Part 4
- High Voltage Engineering MCQs Part 5
- High Voltage Engineering MCQs Part 6
- High Voltage Engineering MCQs Part 7
- High Voltage Engineering MCQs Part 8
- High Voltage Engineering MCQs Part 9
- High Voltage Engineering MCQs Part 10