This set of High Voltage Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Components of Multistage Impulse Generator”.
1. DC charging set must give a __________ dc voltage of __________ polarity to charge the capacitors.
a) variable, either
b) fixed, either
c) variable, positive
d) variable, negative
View Answer
Explanation: The DC charging must give a variable dc voltage of either polarity to charge the capacitors. Usually, the generator capacitances are charged and it helps in producing the desired wave shape.
2. The charging resistors used in an impulse generator circuit is __________
a) non inductive and of high value
b) non inductive and of low value
c) inductive and of high value
d) inductive and of low value
View Answer
Explanation: The charging resistors used in an impulse generator circuit is non inductive and of high value. The range of these resistors lies between 10-100kilo-ohms. The resistors are designed in such a way that they maximum voltage is between 50 and 100kV.
3. The range of the maximum voltage of charging resistors lies between __________
a) 100-200kV
b) 50-100kV
c) 500-1000kV
d) 10-50kV
View Answer
Explanation: The charging resistors used in an impulse generator circuit is non inductive and of high value. The resistors are designed in such a way that they maximum voltage is between 50 and 100kV. The use of charging resistors improves the flexibility of the circuit.
4. The resistance of the charging resistors lies between __________
a) 200-500 kilo-ohms
b) 100-200 kilo-ohms
c) 10-100 kilo-ohms
d) 2-10 kilo-ohms
View Answer
Explanation: The charging resistors used in an impulse generator circuit is non inductive and of high value. The range of these resistors lies between 10-100kilo-ohms. The resistors are designed in such a way that the maximum voltage is between 50 and 100kV.
5. The diameter of the spark gaps used in the impulse generator circuit is __________
a) 2-5cm
b) 5-10cm
c) 10-25cm
d) 25-50cm
View Answer
Explanation: The structure of the spark gaps is usually spherical or hemispheres. The diameter of the spark gaps used in the impulse generator circuit is 10-25cm. All the spark gaps are aligned and the capacitors are placed vertically.
6. The generator capacitors are capable of giving 10kA of current on dead short circuit.
a) True
b) False
View Answer
Explanation: The generator capacitors are capable of giving 10kA of current on dead short circuit. They are arranged vertically and are designed in such a way that several charging and discharging operations can be carried out.
7. What is the range of load capacitors in an impulse generator circuit?
a) 20-30nF
b) 10-100nF
c) 50-70nF
d) 1-10nF
View Answer
Explanation: The range of load capacitors in an impulse generator circuit is 1-10nF. They can be of the compressed gas type or oil filled type.
8. The load is earthed during the charging period (of impulse generator) in a __________
a) Goodlet circuit
b) Marx circuit
c) Van de Graff
d) Chubb-Fortescue circuit
View Answer
Explanation: The load is earthed during the charging period (of impulse generator) in a Goodlet circuit. Hence isolating gap is not necessary for this type of circuit. On discharging time, the first spark gaps attain earth potential unlike Marx circuit.
9. What is the type of voltage dividers used for the measurement?
a) damped capacitor type
b) resistor type
c) inductive type
d) damped capacitor type or resistor type
View Answer
Explanation: The type of voltage dividers used for the measurement is a damped capacitor type or resistor type. Oscilloscopes are used for recording the voltage and sometimes sphere gaps are used for the calibration process.
10. Identify the following circuit.
a) Marx circuit
b) Goodlet circuit
c) Van de Graff
d) Chubb-Fortescue circuit
View Answer
Explanation: The figure shows Goodlet circuit. The load is earthed during the charging period (of impulse generator) in a Goodlet circuit. Hence isolating gap is not necessary in this type of circuit. On discharging time, the first spark gaps attain earth potential unlike Marx circuit.
Sanfoundry Global Education & Learning Series – High Voltage Engineering.
To practice all areas of High Voltage Engineering, here is complete set of Multiple Choice Questions and Answers.
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