# Capacitors MCQs

## A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is:

• A. an integrator
• B. a differentiator
• C. a multiplier
• D. a divider

## A capacitor is constructed of two parallel:

• A. conductors
• B. semiconductors
• C. inductors
• D. dielectrics

## A capacitor stores energy within a dielectric between the conducting plates in the form of:

• A. a magnetic field
• B. positive voltage
• C. negative voltage
• D. an electric field

## A capacitor’s rate of charge is considered:

• A. magnetic
• B. a current block
• C. linear
• D. exponential

## A circuit whose output voltage is proportional to the rate of change of the input voltage is called a(n) ______ .

• A. differentiator
• B. integrator
• C. curve averager
• D. mixer

• A. no
• B. unequal
• C. equal
• D. negative

## A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is:

• A. an integrator
• B. a differentiator
• C. a multiplier
• D. a divider

## A source voltage across a capacitor will:

• A. lead the current by 90 degrees
• B. lead the current by 180 degrees
• C. lag the current by 90 degrees
• D. lag the current by 180 degrees

• A. 63.2
• B. 36.8
• C. 13.5
• D. 5.0

• A. first
• B. third
• C. fifth
• D. seventh

• A. 1 volt
• B. 3 volts
• C. 5 volts
• D. 7 volts

## As a capacitor is being charged, current flowing into the capacitor will:

• A. increase
• B. decrease
• C. remain the same
• D. cannot tell

## As a capacitor is being charged, the voltage across its terminals will:

• A. increase
• B. decrease
• C. remain the same
• D. oppose the source

## Capacitor value markings are usually:

• A. alphanumeric
• B. color dabs
• C. standard
• D. white print

## For a given charge difference, electrostatic field strength varies according to:

• A. plate differential
• B. plate area
• C. plate distance
• D. dielectric quantity

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

• A. AC current is 0.707 of the ac voltage.
• B. AC current lags ac voltage.
• C. AC current is 0.637 of the ac voltage.
• D. AC current leads ac voltage.

• A. 5.0 V
• B. 12.8 V
• C. 13.5 V
• D. 20 V

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

• A. immediately discharge
• B. recharge
• C. remain charged
• D. leak the charge

• A. 10
• B. 100
• C. 1 k
• D. 1 M

## If an open capacitor is checked with an ohmmeter, the needle will:

• A. stay on zero
• B. stay on infinity
• C. move from zero to infinity
• D. move from infinity to zero

• A. 3.3 V
• B. 7.4 V
• C. 6.6 V
• D. 9.4 V

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

• A. increase
• B. decrease
• C. remain the same
• D. be destroyed

• A. 14 mW
• B. 36 mW
• C. 40 mW
• D. 114 mW

• A. 45 V
• B. 50 V
• C. 55 V
• D. 60 V

• A. bandpass
• B. low-pass
• C. high-pass
• D. band-stop

• A. bandpass
• B. low-pass
• C. high-pass
• D. band-stop

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

• A. electrolytic
• B. plastic film
• C. oxide casing
• D. waxed paper

## Power stored from the source and then returned to the source is called:

• A. apparent power
• B. impedance power
• C. reactive power
• D. true power

## The material used between the plates of a capacitor is called its:

• A. insulation material
• B. dielectric material
• C. separation material
• D. plate-divider material

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

• A. plate separation
• B. negative plate only
• C. field strength
• D. charge difference

## The term ______ is derived from a mathematical function in calculus.

• A. differentiator
• B. integrator
• C. filter
• D. voltage-divider

## What do variable capacitors use for dielectric?

• A. ceramic, electrolytic, mica, or paper
• B. air, ceramic, mica, or plastic
• C. ceramic, paper, plastic, or mica
• D. mica, ceramic, plastic, or electrolytic

## What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?

• A. 27.3 degrees
• B. 62.7 degrees
• C. –27.3 degrees
• D. –62.7 degrees

• A. 0.2
• B. 0.5
• C. 0.02
• D. 0.003

## What is the dielectric constant for ceramic?

• A. between 6 and 8000
• B. 5.0
• C. between 5 and 1000
• D. 3000

• A. 214 ohms
• B. 313 ohms
• C. 414 ohms
• D. 880 ohms

• A. 0.2 ohms
• B. 3.5 ohms
• C. 4.6 ohms
• D. 13 ohms

• A. 0.0 W
• B. 0.8 W
• C. 1.0 W
• D. 1.25 W

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

• A. zero
• B. moderate
• C. infinite
• D. cannot tell