High Voltage Engineering MCQs
- The worst gap for measuring the voltages is:
- Field gap
- Sphere gap
- Rod gap
- All of these
Ans: 3
2. Usually Mole’s bridge is used to measure __________ frequency measurements:
-
- Low
- High
- Both of these
- None of these
Ans: 1
3. Impulse tests are performed on transformers:
-
- To determine insulation ability against transient voltages
- To test the moisture content in fuel
- Both of these
- All of these
Ans: 1
4. The penning effect demonstrates:
-
- Decrease in dielectric strength of mixture of gases
- Increases in dielectric strength of mixture of gases
- Decrease in dielectric strength of a gas
- Increase in dielectric strength of a gas
Ans: 1
5. Usually, the switching surge is ___________by the operation of switches or breakers:
-
- Self-induced
- Not-induced
6. According to suspended particle theory, if ε1 > ε2, then force F is directed towards:
-
-
- Minimum stress areas
- Maximum stress areas
- Both of these
- None of these
-
Ans: 1
7. The phenomenon of corona takes place in case of:
-
- Alternating currents
- Direct Currents
- Both of these
- 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:
-
- It occurs at once in single discharge
- The lower the voltages, the higher is the chance of treeing
- It occurs in two discharges
- 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:
-
- in the, increases gradually
- away from the, remains constant
- in the, remains constant
- away from the, increases gradually
Ans: 3
10. The gas which is employed as insulating material:
-
- Oxygen
- Sulphur Hexafluoride
- Tetrafluoromethane
- Ethylamine
Ans: 2