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Electrical Engineering Objective Questions { Electrostatics }

1. Regarding charging of a capacitor which statement is false?
A. the amount of time necessary to discharge a capacitor depends on its size and its series resisto
B. time constant of an R-C circuit is the time required to charge the capacitor to 70.7% of the applied voltage
C. five time-constants are necessary to charge the capacitor to 99 per cent of the applied voltage (or full charge)
D. the value of one time constant = CR

2. A capacitor of 1 RF is charged to 100 V and then disconnected from the power supply. Another uncharged capacitor of 3 AF is now connected a cross it. The common voltage across the combination is ?volt.

3.  A series R-C circuit having R = 5S2 and C =100 p.F has a time constant of
B. 5 x 10-4 s
C. 0.005 s
D. 500 s

4. If a test lamp lights up when connected in series with a capacitor and a suitable dc supply, it clearly shows that the capacitor is
A. short-circuited
B. fully-charged
C. fully-discharged
D. open-circuited

5. When a rectangular voltage waveform is applied to a capacitor, the waveform of its charging current is
A. sinusoidal
B. sawtooth
C. rectangular
D. none of the above

6. Which one of the following types of capacitor is polarized?
A. electrolytic
B. ceramic
C. paper
D. Mylar

7. The type of by-pass capacitor that works best at high frequencies is
A. electrolytic
B. mica
C. ceramic
D. plexiglas

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