Capacitors MCQs

Question 1

Most older types of paper capacitors have been replaced by which type of construction?

Accepted Answer

plastic film

Answer

electrolytic

Answer

oxide casing

Answer

waxed paper

Question 2

If C1, a 4.7 F capacitor, and C2, a 3.3 F capacitor are in series with 18 Vdc applied, what is the voltage across C1?

Accepted Answer

7.4 V

Answer

3.3 V

Answer

6.6 V

Answer

9.4 V

Question 3

What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source?

Accepted Answer

313 ohms

Answer

214 ohms

Answer

414 ohms

Answer

880 ohms

Question 4

What is the reactance value for a capacitor installed in a dc circuit?

Accepted Answer

infinite

Answer

zero

Answer

moderate

Answer

cannot tell

Question 5

In a purely capacitive circuit,

Accepted Answer

current leads voltage by 90°

Answer

voltage leads current by 90°

Answer

current lags voltage by 90°

Answer

current and voltage have a phase relationship of 0°

Question 6

What is the capacitive reactance if I = 1 amp, V = 2 volts, C = 5 F, and frequency = 10 Hz?

Accepted Answer

0.003

Answer

0.2

Answer

0.5

Answer

0.02

Question 7

What is wrong with a leaky capacitor?

Accepted Answer

The dielectric resistance has decreased.

Answer

It is open.

Answer

It is shorted.

Answer

The dielectric resistance has increased.

Question 8

What is the value of a capacitor labeled 102?

Accepted Answer

1000 pF

Answer

10,000 pF

Answer

1000 mu.gifF

Answer

10,000 mu.gifF

Question 9

If the dielectric constant of a capacitor is decreased, then its capacitance will:

Accepted Answer

decrease

Answer

increase

Answer

remain the same

Answer

be destroyed