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Circuits and Circuit Theory - Interview Questions and Answers

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16. The form factor is the ratio of
A. peak value to r.m.s. value
B. r.m.s. value to average value
C. average value to r.m.s. value
D. none of the above
Explanation: ANSWER : : r.m.s. value to average value Explanation :
17. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.
A. 2.5
B. 5
C. 10
D. 15
Explanation: ANSWER : : 10 Explanation :
18. If two sine waves of the same frequency have a phase difference of JT radians, then
A. both will reach their minimum values at the same instant
B. both will reach their maximum values at the same instant
C. when one wave reaches its maximum value, the other will reach its minimum value
D. none of the above
Explanation: ANSWER : : when one wave reaches its maximum value, the other will reach its minimum value Explanation :
19. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
A. a sinusoid of the same frequency
B. a sinusoid of half the original frequency
C. a sinusoid of double the frequency
D. not a sinusoid
Explanation: ANSWER : : a sinusoid of the same frequency Explanation :
20. For a sine wave with peak value Emax______8.30. the average value is
A. 0.636 Emax
B. 0.707 Emax
C. 0.434 EWc
D. lAUEmax
Explanation: ANSWER : : 0.636 Emax Explanation :
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