High Voltage Engineering MCQs Multiple Choice Questions Part 5

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High Voltage Engineering MCQs

  1. The worst gap for measuring the voltages is:
    1. Field gap
    2. Sphere gap
    3. Rod gap
    4. All of these

Ans: 3

2. Usually Mole’s bridge is used to measure __________ frequency measurements:

    1. Low
    2. High
    3. Both of these
    4. None of these

Ans: 1

3. Impulse tests are performed on transformers:

    1. To determine insulation ability against transient voltages
    2. To test the moisture content in fuel
    3. Both of these
    4. All of these

Ans: 1

4. The penning effect demonstrates:

    1. Decrease in dielectric strength of mixture of gases
    2. Increases in dielectric strength of mixture of gases
    3. Decrease in dielectric strength of a gas
    4. Increase in dielectric strength of a gas

Ans: 1

5. Usually, the switching surge is ___________by the operation of switches or breakers:

    1. Self-induced
    2. Not-induced

6. According to suspended particle theory, if ε1 > ε2, then force F is directed towards:

      1. Minimum stress areas
      2. Maximum stress areas
      3. Both of these
      4. None of these

Ans: 1

7. The phenomenon of corona takes place in case of:

    1. Alternating currents
    2. Direct Currents
    3. Both of these
    4. None of these

Ans: 3

8. The phenomenon of treeing is expected to occur in the dielectric which has a non-uniform field. The correct statement about treeing:

    1. It occurs at once in single discharge
    2. The lower the voltages, the higher is the chance of treeing
    3. It occurs in two discharges
    4. None of these

Ans: 4

9. According to bubble theory of liquid breakdown, the vapor bubble elongates __________ direction of the electric field and its volume ___________ during elongation:

    1. in the, increases gradually
    2. away from the, remains constant
    3. in the, remains constant
    4. away from the, increases gradually

Ans: 3

10. The gas which is employed as insulating material:

    1. Oxygen
    2. Sulphur Hexafluoride
    3. Tetrafluoromethane
    4. Ethylamine

Ans: 2

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