1728 + Mcqs in Electronics Page 20 McqOptions

951.	In the given circuit, the current flowing through R3 equals ______.
A.	10 mA
B.	21.11 mA
C.	90 mA
D.	100 mA
Answer» B. 21.11 mA

Discussion

952.	Series components in a series parallel circuit may be in series with other _______________ components, or with other _______________ components.
A.	individual, combinations of
B.	series, parallel
C.	parallel, series
D.	shunt, parallel
Answer» B. series, parallel

Discussion

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

Discussion

954.	The term integrator is derived from a mathematical function in trigonometry.
A.	True
B.	False
Answer» C.

Discussion

955.	In an RC series circuit VS = VC + VR.
A.	True
B.	False
Answer» C.

Discussion

956.	When a capacitor is charging, current will flow through its dielectric.
A.	True
B.	False
Answer» C.

Discussion

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

Discussion

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

Discussion

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

Discussion

960.	The impedance in an RC parallel circuit is
A.	True
B.	False
Answer» C.

Discussion

961.	What is the high cutoff frequency for an RLC circuit that resonates at 2000 Hz and has a bandwidth of 250 Hz?
A.	2125 Hz
B.	2250 Hz
C.	1750 Hz
D.	8.0 Hz
Answer» B. 2250 Hz

Discussion

962.	Current in a series RLC circuit may always be used as:
A.	a leading vector
B.	a reference
C.	an angle
D.	a lagging vector
Answer» C. an angle

Discussion

963.	Often a common-collector will be the last stage before the load; the main function of this stage is to
A.	provide voltage gain
B.	buffer the voltage amplifiers from the low-resistance load
C.	provide phase inversion
D.	provide a high-frequency path to improve the frequency response
Answer» C. provide phase inversion

Discussion

964.	In order for feedback oscillators to have any practical value, the gain has to be
A.	< 1
B.	self-adjusting
C.	stabilized
D.	nonlinear
Answer» C. stabilized

Discussion

965.	To get a negative gate-source voltage in a self-biased JFET circuit, you must use a
A.	voltage divider
B.	source resistor
C.	ground
D.	negative gate supply voltage
Answer» C. ground

Discussion

966.	In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid
A.	crossover distortion
B.	unusually high efficiency
C.	negative feedback
D.	a low input impedance
Answer» B. unusually high efficiency

Discussion

967.	The depletion-mode MOSFET
A.	can operate with only positive gate voltages
B.	can operate with only negative gate voltages
C.	cannot operate in the ohmic region
D.	can operate with positive as well as negative gate voltages
Answer» E.

Discussion

968.	Three different points are shown on a dc load line. The upper point represents the
A.	minimum current gain
B.	quiescent point
C.	saturation point
D.	cutoff point
Answer» D. cutoff point

Discussion

969.	A short circuit will have:
A.	a small current flow
B.	a large current flow
C.	no current flow
D.	some current flow
Answer» C. no current flow

Discussion

970.	The basic difference between a fuse and a circuit breaker is
A.	a fuse is slower
B.	a fuse is reusable
C.	a circuit breaker is reusable
D.	a circuit breaker is more reliable
Answer» D. a circuit breaker is more reliable

Discussion

971.	Which is the smallest?
A.	atom
B.	proton
C.	neutron
D.	electron
Answer» E.

Discussion

972.	A secondary cell generates dc via chemical activity; a primary cell generates dc:
A.	electrically
B.	thermally
C.	optically
D.	chemically
Answer» E.

Discussion

973.	In a parallel resistive circuit:
A.	there is more than one current path between two points
B.	the voltage applied divides between the branches
C.	the total branch power exceeds the source power
D.	the total circuit conductance is less than the smallest branch conductance
Answer» B. the voltage applied divides between the branches

Discussion

974.	Kirchhoff's current law for parallel circuits states that the:
A.	sum of all branch voltages equals zero
B.	total circuit resistance is less than the smallest branch resistor
C.	sum of currents into a junction is equal to the difference of all the branch currents
D.	sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction
Answer» E.

Discussion

975.	Which component is open?
A.	R1
B.	R2
C.	R3
D.	R4
Answer» D. R4

Discussion

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

Discussion

977.	A 10 F capacitor will have more capacitive reactance than a 20 F capacitor in a 60 Hz circuit.
A.	True
B.	False
Answer» B. False

Discussion

978.	What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?
A.	3.00 V
B.	12.37 V
C.	34.98 V
D.	48.00 V
Answer» C. 34.98 V

Discussion

979.	The capacitor that produces an ac ground is called a(n)
A.	coupling capacitor
B.	dc open
C.	bypass capacitor
D.	ac open
Answer» D. ac open

Discussion

980.	All computer programs for a machine are called ________.
A.	software
B.	firmware
C.	hardware
D.	none of the above
Answer» B. firmware

Discussion

981.	If four 10 k resistors are in series with a single 20 k resistor and one of the parallel resistors shorts, the voltage across the other parallel resistors ________.
A.	increases
B.	decreases
C.	remains the same
D.	drops to zero
Answer» C. remains the same

Discussion

982.	What is the total inductance, assuming no mutual inductance?
A.	12 mH
B.	6 mH
C.	0.73 mH
D.	0 mH
Answer» B. 6 mH

Discussion

983.	A magnetic field results whenever a current flows through a conductor.
A.	True
B.	False
Answer» B. False

Discussion

984.	A transformer can be designed to step up or step down dc voltage.
A.	True
B.	False
Answer» C.

Discussion

985.	The current lags the voltage in the given circuit.
A.	True
B.	False
Answer» B. False

Discussion

986.	Rectifier output polarity depends upon:
A.	cycles of input
B.	capacitor polarity
C.	half or full wave
D.	diode installation
Answer» E.

Discussion

987.	The number of electrons in a stable atom is the same as the number of protons in its nucleus.
A.	True
B.	False
Answer» B. False

Discussion

988.	Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.
A.	does not change
B.	doubles for every 1 kHz increase in frequency
C.	increases
D.	decreases
Answer» E.

Discussion

989.	In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.
A.	reduced, equals one
B.	reduced, is less than one
C.	increased, is more than one
D.	increased, is much greater than one
Answer» B. reduced, is less than one

Discussion

990.	The given circuit is a two-pole, active ______ filter.
A.	high-pass
B.	low-pass
C.	band-pass
D.	band-stop
Answer» C. band-pass

Discussion

991.	The ______________ input makes the summing amplifier circuit possible.
A.	virtual ground at the noninverting
B.	virtual ground at the inverting
C.	low-voltage
D.	high-voltage
Answer» C. low-voltage

Discussion

992.	The critical frequency for the active filter in the given circuit is approximately _______.
A.	20.1 kHz
B.	89.3 kHz
C.	14.2 kHz
D.	179 kHz
Answer» B. 89.3 kHz

Discussion

993.	A two-diode rectifier will not operate without a _________.
A.	center-tapped transformer
B.	voltage regulator
C.	capacitive filter
D.	phase-inverting transformer
Answer» B. voltage regulator

Discussion

994.	The atomic number is the number of neutrons in the nucleus of an atom.
A.	True
B.	False
Answer» C.

Discussion

995.	A string of resistors in a series circuit will:
A.	divide the source voltage in proportion to their values
B.	reduce the power to zero
C.	cause the current to divide
D.	increase the source voltage in proportion to the values
Answer» B. reduce the power to zero

Discussion

996.	If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor?
A.	4 mA
B.	6 mA
C.	8 mA
D.	12 mA
Answer» C. 8 mA

Discussion

997.	Increasing the number of magnetic poles in a basic generator will ___.
A.	increase the generator's output voltage amplitude
B.	increase the generator's output frequency
C.	decrease the generator's output voltage amplitude
D.	decrease the generator's output frequency
Answer» C. decrease the generator's output voltage amplitude

Discussion

998.	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.
Answer» E.

Discussion

999.	___ capacitors have the highest values of capacitance.
A.	Electrolytic
B.	Ceramic
C.	Plastic-film
D.	Mica
Answer» B. Ceramic

Discussion

1000.	In the given circuit, VIN1 equals ______.
A.	+4 V
B.	+20 V
C.	4 V
D.	20 V
Answer» D. 20 V

Discussion

Explore topic-wise MCQs in Engineering.

In the given circuit, the current flowing through R3 equals ______.

Series components in a series parallel circuit may be in series with other _______________ components, or with other _______________ components.

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

The term integrator is derived from a mathematical function in trigonometry.

In an RC series circuit VS = VC + VR.

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

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

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

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

The impedance in an RC parallel circuit is

What is the high cutoff frequency for an RLC circuit that resonates at 2000 Hz and has a bandwidth of 250 Hz?

Current in a series RLC circuit may always be used as:

Often a common-collector will be the last stage before the load; the main function of this stage is to

In order for feedback oscillators to have any practical value, the gain has to be

To get a negative gate-source voltage in a self-biased JFET circuit, you must use a

In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid

The depletion-mode MOSFET

Three different points are shown on a dc load line. The upper point represents the

A short circuit will have:

The basic difference between a fuse and a circuit breaker is

Which is the smallest?

A secondary cell generates dc via chemical activity; a primary cell generates dc:

In a parallel resistive circuit:

Kirchhoff's current law for parallel circuits states that the:

Which component is open?

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

A 10 F capacitor will have more capacitive reactance than a 20 F capacitor in a 60 Hz circuit.

What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?

The capacitor that produces an ac ground is called a(n)

All computer programs for a machine are called ________.

If four 10 k resistors are in series with a single 20 k resistor and one of the parallel resistors shorts, the voltage across the other parallel resistors ________.

What is the total inductance, assuming no mutual inductance?

A magnetic field results whenever a current flows through a conductor.

A transformer can be designed to step up or step down dc voltage.

The current lags the voltage in the given circuit.

Rectifier output polarity depends upon:

The number of electrons in a stable atom is the same as the number of protons in its nucleus.

Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.

In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.

The given circuit is a two-pole, active ______ filter.

The ______________ input makes the summing amplifier circuit possible.

The critical frequency for the active filter in the given circuit is approximately _______.

A two-diode rectifier will not operate without a _________.

The atomic number is the number of neutrons in the nucleus of an atom.

A string of resistors in a series circuit will:

If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor?

Increasing the number of magnetic poles in a basic generator will ___.

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

___ capacitors have the highest values of capacitance.

In the given circuit, VIN1 equals ______.

Series components in a series parallel circuit may be in series with other _ components, or with other _ components.

In order to sustain oscillations in a feedback oscillator, the gain should be ___ so the Acl _.