# High Voltage Engineering MCQs Part 7

1. The most recommended gap under usual conditions for measuring the voltages is:
1. Field gap
2. Sphere gap
3. Rod gap
4. All of these
• Correct answer: 2. Sphere gap
2. According to Paschen’s law, the breakdown voltage = __________:
1. F (p/d)
2. F / (pd)
3. F (pd)
4. F + p + d
• Correct answer: 3. F (pd)
3. The voltage at which electrical stress in the insulation makes the insulator to fail is:
1. Withstand voltage
2. Impulse voltage
3. Disruptive discharge voltage
4. None of these
• Correct answer: 3. Disruptive discharge voltage
4. Sphere gaps can measure:
1. Peak value of d.c
2. Peak value of a.c
3. Both of these
4. None of these
• Correct answer: 3. Both of these
5. The design of Marx multistage impulse generator involves the condensers which are:
1. Charged in parallel and discharged in series
2. Charged in series and discharged in series
3. Charged in parallel and discharged in parallel
4. Charged in series and discharged in parallel
• Correct answer: 1. Charged in parallel and discharged in series
6. The radial stress of Oil impregnated paper capacitor busing is:
1. 10 kV/cm
2. 20 kV/cm
3. 30 kV/cm
4. 40 kV/cm
• Correct answer: 4. 40 kV/cm
7. Reason: The measured breakdown voltage is more influenced by weak medium than the solid medium. Affirmation: The treeing phenomenon occurs in dielectrics which have a non-uniform field.
1. Affirmation is caused by the reason
2. Affirmation and reason have no relationship
3. Reason is correct, affirmation is wrong
4. Affirmation is correct, reason is wrong
5. None of these
• Correct answer: Affirmation is caused by the reason
8. According to suspended particle theory, if ε2 > ε1, then force F is directed towards:
1. Minimum stress areas
2. Maximum stress areas
3. Both of these
4. None of these
• Correct answer: 2. Maximum stress areas
9. Which statement correctly illustrates the Suspended particle theory:
1. The larger the size of impurity particles, the lower the breakdown strength
2. The larger the size of impurity particles, the higher the breakdown strength
• Correct answer: 1. The larger the size of impurity particles, the lower the breakdown strength
10. Liquid A is a pure liquid. Liquid B is the same liquid with solid impurities. The correct statement about their dielectric strengths is:
1. Liquid A > Liquid B
2. Liquid A = Liquid B
3. Liquid A < Liquid B
• Correct answer: 1. Liquid A > Liquid B