# Generation of high voltages and currents - Electrical Engineering (MCQ) questions and answers

1)   The voltage doubler circuit is suitable for the voltage up to

a. 2V
b. 4V
c. 6V
d. 8V
 Answer  Explanation ANSWER: 4V Explanation: No explanation is available for this question!

2)   In large impulse generators, the spark gaps are generally

a. Sphere gaps
b. Hemispherical gaps
c. Square gaps
d. Either (a) or (b)
 Answer  Explanation ANSWER: Either (a) or (b) Explanation: No explanation is available for this question!

3)   For producing large values of impulse currents, a number of capacitors are charged in

a. Parallel and discharged in series
b. Parallel and discharged in parallel
c. Series and discharged in series
d. Series and discharged in parallel
 Answer  Explanation ANSWER: Parallel and discharged in parallel Explanation: No explanation is available for this question!

4)   In a multistage impulse generator, for producing very high voltages, a bank of capacitors is

a. Charged in parallel and then discharged in series
b. Charged in series and then discharged in parallel
c. Charged in parallel and then discharged in parallel only
d. Charged in series and then discharged in series only
 Answer  Explanation ANSWER: Charged in parallel and then discharged in series Explanation: No explanation is available for this question!

5)   In a series RLC circuit, the wave front and wave tail times are controlled by changing the value

a. R only
b. R and L simultaneously
c. R and C simultaneously
d. L and C simultaneously
 Answer  Explanation ANSWER: R and L simultaneously Explanation: No explanation is available for this question!

6)   The disadvantages of resonant transformers is

a. Pure sine wave output
b. No high power arcing
c. No repeated flashovers

7)   In Van de Graaff generators, the shape of high voltage electrode is nearly spherical to avoid

b. Corona
c. Local discharges
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

8)   A two-pulse circuit requires

a. Double the number of diodes and half of the no. of capacitors required for single-pulse circuits
b. Half of the no. of diodes and double the no. of capacitors required for single-pulse circuits
c. Double the no. of diodes and one and a half times the capacitors required for single-pulse circuits
d. One and a half times the no. of diodes and double the capacitors required for single-pulse circuits
 Answer  Explanation ANSWER: Double the no. of diodes and one and a half times the capacitors required for single-pulse circuits Explanation: No explanation is available for this question!

9)   The ripple voltage for half wave rectifier is

a. Smaller than that of full wave rectifier
b. Larger than that of full wave rectifier
c. Equal to that of full wave rectifier
d. None of these
 Answer  Explanation ANSWER: Larger than that of full wave rectifier Explanation: No explanation is available for this question!

10)   In the half wave rectifier, charging current can be limited by using an additional

a. Resistance in series with the secondary of the transformer
b. Inductance in series with the primary of the transformer
c. Inductance in series with the primary of the transformer
d. Capacitance in series with the secondary of the transformer
 Answer  Explanation ANSWER: Resistance in series with the secondary of the transformer Explanation: No explanation is available for this question!