High Voltage Engineering MCQs Multiple Choice Questions Part 5

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

Ans: 1

3. Impulse tests are performed on transformers:

1. 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. 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. 1. Self-induced
   2. Not-induced

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

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

Ans: 2