Capacitors MCQs

Question 1

In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?

Accepted Answer

high-pass

Answer

bandpass

Answer

low-pass

Answer

band-stop

Question 2

A practical capacitor

Accepted Answer

looks like a capacitor in parallel with a resistor

Answer

is a short to dc

Answer

is an open to ac

Answer

stores energy in a magnetic field

Question 3

Which of the following is the reference vector for parallel RC circuits?

Accepted Answer

V

Answer

R

Answer

I

Answer

C

Question 4

What do variable capacitors use for dielectric?

Accepted Answer

air, ceramic, mica, or plastic

Answer

ceramic, electrolytic, mica, or paper

Answer

ceramic, paper, plastic, or mica

Answer

mica, ceramic, plastic, or electrolytic

Question 5

If a charged capacitor is disconnected from a circuit, it will:

Accepted Answer

leak the charge

Answer

immediately discharge

Answer

recharge

Answer

remain charged

Question 6

What is the total current for a 5 MHz, 1 Vac circuit that consists of a 27 pF capacitor and a 1 k resistor connected in parallel?

Accepted Answer

1.31 mA

Answer

459 A

Answer

647 A

Answer

1.85 mA

Question 7

What is the value of a capacitor that can store two coulombs of charge when 500 volts is applied across its plates?

Accepted Answer

4,000 F

Answer

4 F

Answer

250 F

Answer

250 F

Question 8

The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:

Accepted Answer

plate separation

Answer

negative plate only

Answer

field strength

Answer

charge difference

Question 9

How is ac current related to ac voltage in a purely capacitive circuit?

Accepted Answer

AC current leads ac voltage.

Answer

AC current is 0.707 of the ac voltage.

Answer

AC current lags ac voltage.

Answer

AC current is 0.637 of the ac voltage.