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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
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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.
A.25
B.75
C.33.3
D.50
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3.  A series R-C circuit having R = 5S2 and C =100 p.F has a time constant of
A.20
B. 5 x 10-4 s
C. 0.005 s
D. 500 s
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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
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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
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6. Which one of the following types of capacitor is polarized?
A. electrolytic
B. ceramic
C. paper
D. Mylar
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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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