**High Voltage Engineering MCQs**

1. The ideal lightning arrester is the one which:

- Stops the flow of electric current above rated voltage
- Conducts electric current above rated voltage
- Any of these
- None of these

Ans: 2

2. During impulse withstand test the impulse applied to the insulator is:

- 1/50 μ sec
- 0.1/0.05 μ sec
- 0.01/50 μ sec
- 0.001/50 μ sec

Ans: 1

3. The IR test of capacitor is performed by using ____________:

- A Schering bridge
- The Chubb-Fortescue method
- The standard Ohmmeter
- A Megger

Ans: 4

4. The test which is performed on circuit breakers:

- Short time current test
- Making capacity test
- Breaking capacity test
- 2 & 3
- All of these

Ans: 5

5. The necessary condition for performing sphere gap test is:

- The length of gap should be 4 times greater than radius of sphere
- An impulse wave of 50000 kV should be applied
- Wave front time should be between 0.7 μs and 0.8 μs
- The length of gap should be smaller than radius of sphere

Ans: 4

6. The electrostatic voltmeter using SF6 can measure the voltage level up to ________:

- 500 kV
- 1000 kV
- 10000 kV
- 100000 kV

Ans: 2

7. The generating voltmeter is driven by ______________ which _____________ energy from measuring source:

- Constant speed motor, absorbs
- Constant speed motor, doesn’t absorb
- Variable speed motor, absorbs
- Variable speed motor, doesn’t absorb

Ans: 2

8. The breakdown of solid materials is mathematically related by the equation:

- V
_{b}ln t_{b}= constant - V
_{b}* t_{b}= constant - 3.87 V
_{b}ln t_{b}= constant - 9.8 V
_{b}* t_{b}= constant

Ans: 1

9. Void discharges are classified as:

- External partial discharges
- Internal partial discharges
- Any of these
- None of these

Ans: 2

10. Correct statement about Matched lines:

- They have reflection
- They have no reflection
- They have reflection whose impedance equals the impedance of alternating power it
- None of the above

Ans: 2