This set of High Voltage Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Circuits for Producing Impulse”.

1. Identify the elements in the given circuit for producing impulse wave.

a) C_{1}-generator capacitance, C_{2}-load capacitance, R_{1}-front resistance, R_{2}-tail resistance

b) C_{1}– load capacitance, C_{2}– generator capacitance, R_{1}-front resistance, R_{2}-tail resistance

c) C_{1}– load capacitance, C_{2}– generator capacitance, R_{1} tail resistance, R_{2}– front resistance

d) C_{1}-generator capacitance, C_{2}-load capacitance, R_{1}-tail resistance, R_{2}-front resistance

View Answer

Explanation: The wave front and wave tail times are independently controlled by changing either R

_{1}or R

_{2}separately. The test objects which are mainly capacitive in nature form part of C

_{2}.

2. A double exponential waveform can be developed with R-L-C circuit under over damped condition.

a) True

b) False

View Answer

Explanation: A double exponential waveform can be developed with R-L-C circuit under over damped condition. Usually series combination of R-L-C circuit is used. The wave can also be produced by the combination of R-C circuits.

3. *α* controls the ____________

a) front time

b) tail time

c) peak time

d) decay time

View Answer

Explanation: The double exponential voltage is given by the equation V=V

_{o}[exp (-

*α*t)-exp (-

*β*t)].

*α*controls the front time, where

*α*is a constant of microsecond value.

4. *β* controls the ____________

a) front time

b) tail time

c) peak time

d) rise time

View Answer

Explanation: The double exponential voltage is given by the equation V=V

_{o}[exp (-

*α*t)-exp (-

*β*t)].

*β*controls the tail time, where

*β*is a constant of microsecond value.

5. Wave front time is controlled by changing the value of ____________

a) resistance

b) inductance

c) resistance and inductance

d) capacitance

View Answer

Explanation: Wave front time and wave tail is controlled by changing the value of resistance and Inductance. The generator capacitance will be given.

*α*controls the front time, where

*α*is a constant of microsecond value.

*β*controls the tail time, where

*β*is a constant of microsecond value.

6. The choice of the resistance depends on the ratio of _____

a) \(\frac{C_2}{C_1}\)

b) \(\frac{C_1}{C_2}\)

c) \(2 \frac{C_2}{C_1}\)

d) \(2 \frac{C_1}{C_2}\)

View Answer

Explanation: The resistance R is divided into two resistors R

_{1}and R

_{2}to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C

_{1}is the generator capacitance and C

_{2}is the load capacitance of the circuit.

7. The minimum value of \(\frac{C_1}{C_2}\) for \(\frac{1}{50}\) μs wave is_____

a) 0.1

b) 0.01

c) 1.0

d) .001

View Answer

Explanation: The minimum value of \(\frac{C_1}{C_2}\) for \(\frac{1}{50}\) μs wave is 0.01. The resistance R is divided into two resistors R

_{1}and R

_{2}to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C

_{1}is the generator capacitance and C

_{2}is the load capacitance of the circuit.

8. The minimum value of \(\frac{C_1}{C_2}\) for \(\frac{1}{5}\) μs wave is _____

a) 0.1

b) 0.01

c) 1.0

d) 0.3

View Answer

Explanation: The minimum value of \(\frac{C_1}{C_2}\) for \(\frac{1}{5}\) μs wave is 0.3. The resistance R is divided into two resistors R

_{1}and R

_{2}to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C

_{1}is the generator capacitance and C

_{2}is the load capacitance of the circuit.

9. Oscillations in the wave front and wave tail is caused as a result of the effect of inductance in the circuit.

a) True

b) False

View Answer

Explanation: Oscillations in the wave front and wave tail is caused as a result of the effect of inductance in the circuit. Inductance in the circuit is present in different forms such as stray inductance, residual inductance and circuit loop inductance.

10. *β* is dependent on ___________

a) load capacitance

b) generator capacitance

c) load inductance

d) generator inductance

View Answer

Explanation:

*β*is dependent on load capacitance.

*β*controls the tail time, where

*β*is a constant of microsecond value. It is inversely proportional to the generator capacitance.

11. *α* is dependent on _____________

a) load capacitance

b) generator capacitance

c) load inductance

d) generator inductance

View Answer

Explanation:

*α*is dependent on generator capacitance.

*α*controls the front time, where

*α*is a constant of microsecond value. It is inversely proportional to the generator capacitance.

12. What is the value of *α* and *β* for a standard lighting impulse?

a) *α*=0.03456 , *β*=3.534

b) *α*=0.01460 , *β*=2.467

c) *α*= 0.56, *β*=3.545

d) *α*=2.3 , *β*=5.456

View Answer

Explanation: The double exponential voltage is given by the equation V=Vo [exp (-

*α*t)-exp (-

*β*t)].

*α*controls the front time, where

*α*is a constant of microsecond value.

*β*controls the tail time, where

*β*is a constant of microsecond value. The value of

*α*and

*β*for a standard lighting impulse is

*α*=0.01460,

*β*=2.467.

**Sanfoundry Global Education & Learning Series – High Voltage Engineering.**

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