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) C1-generator capacitance, C2-load capacitance, R1-front resistance, R2-tail resistance
b) C1– load capacitance, C2– generator capacitance, R1-front resistance, R2-tail resistance
c) C1– load capacitance, C2– generator capacitance, R1 tail resistance, R2– front resistance
d) C1-generator capacitance, C2-load capacitance, R1-tail resistance, R2-front resistance
View Answer
Explanation: The wave front and wave tail times are independently controlled by changing either R1 or R2 separately. The test objects which are mainly capacitive in nature form part of C2.
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=Vo[exp (-αt)-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=Vo[exp (-αt)-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 R1 and R2 to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C1 is the generator capacitance and C2 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 R1 and R2 to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C1 is the generator capacitance and C2 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 R1 and R2 to offer flexibility. The choosing of these resistors depend on the ratio of \(\frac{C_1}{C_2}\) where C1 is the generator capacitance and C2 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 (-αt)-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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