177 + Mcqs in Capacitors Page 2 McqOptions

51.	When the voltage across a capacitor is tripled, the stored charge
A.	Triples
B.	Is cut to one-third
C.	Stays the same
D.	Doubles
Answer» B. Is cut to one-third

Discussion

52.	A capacitor of 2,000 pF is greater than
A.	0.02 µF
B.	0.002 µF
C.	0.0002 µF
D.	0.0000002 F
Answer» D. 0.0000002 F

Discussion

53.	Five time constants are required for a capacitor to charge fully or discharge fully.
A.	True
B.	False
Answer» B. False

Discussion

54.	Voltage leads current by 90° in a capacitor.
A.	True
B.	False
Answer» C.

Discussion

55.	What is the capacitance when Q = 60 µC and V = 12 V?
A.	720 µF
B.	5 µF
C.	50 µF
D.	12 µF
Answer» C. 50 µF

Discussion

56.	A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is
A.	3 V
B.	6 V
C.	4 V
D.	0 V
Answer» C. 4 V

Discussion

57.	A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current
A.	Increases
B.	Remains constant
C.	Decreases
D.	Ceases
Answer» D. Ceases

Discussion

58.	Which of the following capacitors is polarized?
A.	Mica
B.	Ceramic
C.	Plastic-film
D.	Electrolytic
Answer» E.

Discussion

59.	A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than
A.	2 µF
B.	4 µF
C.	10 µF
D.	1.5 µF
Answer» E.

Discussion

60.	When the plate area of a capacitor increases,
A.	The capacitance increases
B.	The capacitance decreases
C.	The capacitance is unaffected
D.	The voltage it can withstand increases
Answer» B. The capacitance decreases

Discussion

61.	A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?
A.	8 V
B.	80 V
C.	800 V
D.	0.88 V
Answer» B. 80 V

Discussion

62.	The opposition to ac from a capacitor is called reluctance.
A.	1
B.
Answer» C.

Discussion

63.	When a capacitor is charging, current will flow through its dielectric.
A.	1
B.
Answer» C.

Discussion

64.	This circuit is an RC integrator.
A.	1
B.
Answer» C.

Discussion

65.	Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates.
A.	1
B.
Answer» C.

Discussion

66.	A capacitor takes ___ time constants to charge to 95% of its capacity.
A.	2
B.	3
C.	4
D.	5
Answer» C. 4

Discussion

67.	Capacitors in parallel have a higher total value than any individual capacitor.
A.	1
B.
Answer» B.

Discussion

68.	In an RC series circuit VS = VC + VR.
A.	1
B.
Answer» C.

Discussion

69.	The term ‚Äúintegrator‚Äù is derived from a mathematical function in trigonometry.
A.	1
B.
Answer» C.

Discussion

70.	The impedance in an RC parallel circuit is
A.	1
B.
Answer» C.

Discussion

71.	The reactance of C2 is _____ in the given circuit.
A.	66
B.	80
C.	199
D.	398
Answer» E.

Discussion

72.	This circuit is a low-pass filter.
A.	1
B.
Answer» C.

Discussion

73.	The ___ of a capacitor affects the time it takes to charge and discharge.
A.	package style
B.	lead arrangement
C.	plate area
D.	voltage rating
Answer» D. voltage rating

Discussion

74.	The true power in an RC series circuit is PR = I2 x R.
A.	1
B.
Answer» B.

Discussion

75.	The frequency response curve illustrates that as the frequency of the input increases, the voltage of the output will decrease.
A.	1
B.
Answer» B.

Discussion

76.	The ______ the area of the plates, the greater the number of electrons and ______ that can be stored.
A.	larger, charge
B.	smaller, charge
C.	larger, polarity
D.	smaller, polarity
Answer» B. smaller, charge

Discussion

77.	In a series capacitive circuit the smallest capacitor will have the largest voltage drop across it.
A.	1
B.
Answer» B.

Discussion

78.	An ohmmeter can be used to test a capacitor.
A.	1
B.
Answer» B.

Discussion

79.	The given image is a _____ capacitor.
A.	0.33 pF
B.	0.00033 F
C.	33,000 pF
D.	0.33 F
Answer» E.

Discussion

80.	A discharged capacitor has ______ charges on its plates.
A.	no
B.	unequal
C.	equal
D.	negative
Answer» D. negative

Discussion

81.	The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).
A.	1
B.
Answer» B.

Discussion

82.	A high-pass filter heavily attenuates the higher frequencies.
A.	1
B.
Answer» C.

Discussion

83.	Capacitors are often used as filters.
A.	1
B.
Answer» B.

Discussion

84.	The greater the distance between the plates of a capacitor, the smaller the capacitance value.
A.	1
B.
Answer» B.

Discussion

85.	The rate of charge or discharge of a capacitor is based on ___ function.
A.	an exponential
B.	a linear
C.	a parabolic
D.	a trigonometric
Answer» B. a linear

Discussion

86.	Between any two time constants, the charge on a capacitor changes about 63%.
A.	1
B.
Answer» B.

Discussion

87.	The impedance of an RC series circuit is (R2 +C2)1/2.
A.	1
B.
Answer» C.

Discussion

88.	The frequency response curve for a low-pass filter illustrates that as the frequency of the input increases, the voltage of the output will decrease.
A.	1
B.
Answer» B.

Discussion

89.	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
Answer» D. lag the current by 180 degrees

Discussion

90.	The total circuit reactance is ______ in the given circuit.
A.	50
B.	140
C.	265
D.	676
Answer» D. 676

Discussion

91.	A capacitor is charged when one of its plates has more electrons than the other plate.
A.	1
B.
Answer» B.

Discussion

92.	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
Answer» C. move from zero to infinity

Discussion

93.	As a capacitor is being charged, the voltage across its terminals will:
A.	increase
B.	decrease
C.	remain the same
D.	oppose the source
Answer» B. decrease

Discussion

94.	With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ?
A.	318 pF
B.	2 nF
C.	3.18 F
D.	2 F
Answer» B. 2 nF

Discussion

95.	The basic capacitor is made up of ___ that separates two conductive plates.
A.	a conductor
B.	a spacer
C.	a dielectric
D.	an electrode
Answer» D. an electrode

Discussion

96.	The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons.
A.	1
B.
C.	1
D.
Answer» B.

Discussion

97.	In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result?
A.	bandpass
B.	low-pass
C.	high-pass
D.	band-stop
Answer» C. high-pass

Discussion

98.	If a charged capacitor is disconnected from a circuit, it will:
A.	immediately discharge
B.	recharge
C.	remain charged
D.	leak the charge
Answer» E.

Discussion

99.	The term ______ is derived from a mathematical function in calculus.
A.	differentiator
B.	integrator
C.	filter
D.	voltage-divider
Answer» C. filter

Discussion

100.	If the dielectric constant of a capacitor is decreased, then its capacitance will:
A.	increase
B.	decrease
C.	remain the same
D.	be destroyed
Answer» C. remain the same

Discussion

Explore topic-wise MCQs in Electronics.

When the voltage across a capacitor is tripled, the stored charge

A capacitor of 2,000 pF is greater than

Five time constants are required for a capacitor to charge fully or discharge fully.

Voltage leads current by 90° in a capacitor.

What is the capacitance when Q = 60 µC and V = 12 V?

A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is

A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current

Which of the following capacitors is polarized?

A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than

When the plate area of a capacitor increases,

A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?

The opposition to ac from a capacitor is called reluctance.

When a capacitor is charging, current will flow through its dielectric.

This circuit is an RC integrator.

Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates.

A capacitor takes ___ time constants to charge to 95% of its capacity.

Capacitors in parallel have a higher total value than any individual capacitor.

In an RC series circuit VS = VC + VR.

The term ‚Äúintegrator‚Äù is derived from a mathematical function in trigonometry.

The impedance in an RC parallel circuit is

The reactance of C2 is _____ in the given circuit.

This circuit is a low-pass filter.

The ___ of a capacitor affects the time it takes to charge and discharge.

The true power in an RC series circuit is PR = I2 x R.

The frequency response curve illustrates that as the frequency of the input increases, the voltage of the output will decrease.

The ______ the area of the plates, the greater the number of electrons and ______ that can be stored.

In a series capacitive circuit the smallest capacitor will have the largest voltage drop across it.

An ohmmeter can be used to test a capacitor.

The given image is a _____ capacitor.

A discharged capacitor has ______ charges on its plates.

The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).

A high-pass filter heavily attenuates the higher frequencies.

Capacitors are often used as filters.

The greater the distance between the plates of a capacitor, the smaller the capacitance value.

The rate of charge or discharge of a capacitor is based on ___ function.

Between any two time constants, the charge on a capacitor changes about 63%.

The impedance of an RC series circuit is (R2 +C2)1/2.

The frequency response curve for a low-pass filter illustrates that as the frequency of the input increases, the voltage of the output will decrease.

A source voltage across a capacitor will:

The total circuit reactance is ______ in the given circuit.

A capacitor is charged when one of its plates has more electrons than the other plate.

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

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

With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ?

The basic capacitor is made up of ___ that separates two conductive plates.

The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons.

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

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

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

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

The the area of the plates, the greater the number of electrons and that can be stored.