1475 + Mcqs in Electronic Devices Page 19 McqOptions

901.	The PIV rating of power diodes can be increased by stacking the diodes in series.
A.	True
B.	False
Answer» B. False

Discussion

902.	What are the typical ranges of reverse-bias current levels IS for low-power and high-power Schottky diodes at room temperature?
A.	Picoamperes, nanoamperes
B.	Nanoamperes, microamperes
C.	Microamperes, milliamperes
D.	Milliamperes, amperes
Answer» D. Milliamperes, amperes

Discussion

903.	The magnitude of the third harmonic is ________ of the magnitude of the fundamental.
A.	1
B.	0.5
C.	0.33
D.	0.25
Answer» D. 0.25

Discussion

904.	The ________ region produces the maximum voltage gain in a single-stage BJT or FET amplifier.
A.	low-frequency
B.	mid-frequency
C.	high-frequency
D.	None of the above
Answer» C. high-frequency

Discussion

905.	The resistance associated with the 1-mW power level is ________ , chosen because it is the characteristic impedance of audio transmission lines.
A.	100
B.	250
C.	400
D.	600
Answer» E.

Discussion

906.	An inverting amplifier has an input impedance equal to the feedback resistor Rf.
A.	True
B.	False
Answer» C.

Discussion

907.	Closed-loop gain is the gain with negative feedback.
A.	True
B.	False
Answer» B. False

Discussion

908.	An ideal op-amp circuit has ________input impedance, ________ output impedance, and ________ voltage gain.
A.	zero, infinite, infinite
B.	infinite, zero, zero
C.	zero, zero, infinite
D.	infinite, zero, infinite
Answer» E.

Discussion

909.	An IC unit containing a differential amplifier built using opposite-type MOSFET transistors is referred to as a ________ circuit.
A.	CMOS
B.	BiFET
C.	BiMOS
D.	None of the above
Answer» B. BiFET

Discussion

910.	An input applied to either input terminal will result in ________.
A.	outputs from both output terminals, which have opposite polarities
B.	outputs from both output terminals, which have the same polarities
C.	a single output from one of the output terminals
D.	None of the above
Answer» B. outputs from both output terminals, which have the same polarities

Discussion

911.	A ________ differential amplifier is particularly well suited for battery operation due to its low power consumption.
A.	BiFET
B.	BiMOS
C.	CMOS
D.	BJT
Answer» D. BJT

Discussion

912.	In double-ended (differential) input operation, ________.
A.	an input is applied between the two input terminals
B.	two separate signals are applied to the input terminals
C.	either an input is applied between the two input terminals or two separate signals are applied to the input terminals
D.	None of the above
Answer» D. None of the above

Discussion

913.	If two opposite-polarity input signals are applied, the operation is referred to as ________.
A.	double-ended
B.	single-ended
C.	common-mode
D.	All of the above
Answer» B. single-ended

Discussion

914.	If the same input is applied to both inputs, the operation is called ________.
A.	double-ended
B.	single-ended
C.	common-mode
D.	All of the above
Answer» D. All of the above

Discussion

915.	In a differential amplifier circuit, if an input signal is applied to either input with the other input connected to ground, the operation is referred to as ________.
A.	double-ended
B.	single-ended
C.	common-mode
D.	All of the above
Answer» C. common-mode

Discussion

916.	All practical op-amps have input bias currents and voltages that produce output error voltages.
A.	True
B.	False
Answer» B. False

Discussion

917.	When the open-loop gain of an op-amp is reduced by negative feedback, the bandwidth is increased.
A.	True
B.	False
Answer» B. False

Discussion

918.	The decibel (dB) is defined such that ________ decibel(s) = ________ bel(s).
A.	1, 10
B.	10, 1
C.	1, 1
D.	10, 10
Answer» C. 1, 1

Discussion

919.	Logarithms taken to the base ________ are referred to as common logarithms, while logarithms taken to the base ________ are referred to as natural logarithms.
A.	10, e
B.	e, 10
C.	5, e
D.	10, 5
Answer» B. e, 10

Discussion

920.	A change in frequency by a factor of 10 results in a ________ change in the ratio of the normalized gain.
A.	3-dB
B.	6-dB
C.	10-dB
D.	20-dB
Answer» E.

Discussion

921.	The logarithm of a number ________ than 1 is always ________.
A.	greater, negative
B.	less, positive
C.	less, negative
D.	None of the above
Answer» D. None of the above

Discussion

922.	The ________ in the Fourier series has the same frequency as the square wave itself.
A.	fundamental
B.	third harmonic
C.	fifth harmonic
D.	seventh harmonic
Answer» B. third harmonic

Discussion

923.	Open-loop gain of an op-amp is the voltage gain without feedback.
A.	True
B.	False
Answer» B. False

Discussion

924.	Open-loop gain is always smaller than closed-loop gain.
A.	True
B.	False
Answer» C.

Discussion

925.	The common-mode rejection ratio (CMRR) is a measure of an op-amp's ability to reject common-mode input signals.
A.	True
B.	False
Answer» B. False

Discussion

926.	The ________ of the upper cutoff frequencies defines a ________ possible bandwidth for a system.
A.	highest, maximum
B.	lowest, maximum
C.	lowest, minimum
D.	None of the above
Answer» C. lowest, minimum

Discussion

927.	At very high frequencies, the effect of Ci is to ________ the total impedance of the parallel combination of R1, R2, R3, and Ci.
A.	increase
B.	maintain
C.	decrease
D.	None of the above
Answer» D. None of the above

Discussion

928.	A change in frequency by a factor of 2 results in a ________ change in the ratio of the normalized gain.
A.	3-dB
B.	6-dB
C.	10-dB
D.	20-dB
Answer» C. 10-dB

Discussion

929.	With a BJT amplifier in the high-frequency region, the capacitance Cbe is the ________ of the parasitic capacitances while Cce is the ________.
A.	smallest, largest
B.	largest, smallest
C.	smallest, medium
D.	None of the above
Answer» C. smallest, medium

Discussion

930.	In the input RC circuit of a single-stage BJT or FET amplifier, as the frequency ________, the capacitive reactance ________ and ________ of the input voltage appears across the output terminals.
A.	increases, decreases, more
B.	increases, decreases, less
C.	increases, increases, more
D.	decreases, decreases, less
Answer» B. increases, decreases, less

Discussion

931.	The ________ configuration displays improved high-frequency characteristics over the ________ configuration.
A.	common-collector, common-emitter
B.	common-emitter, common-base
C.	common-emitter, common-collector
D.	common-base, common-emitter
Answer» E.

Discussion

932.	In the low-frequency region, the ________ low-frequency cutoff determined by CS, CC, or CE will have the greatest impact on the network.
A.	highest
B.	average
C.	lowest
D.	None of the above
Answer» B. average

Discussion

933.	For two identical stages in cascade, the drop-off rate in the high- and low-frequency regions has increased to ________ per decade.
A.	3 dB
B.	6 dB
C.	20 dB
D.	40 dB
Answer» E.

Discussion

934.	Voltage gains of ________ dB or higher should immediately be recognized as being quite high.
A.	3
B.	6
C.	20
D.	50
Answer» E.

Discussion

935.	The decibel gain of a cascaded system is the ________ of the decibel gains of each stage.
A.	sum
B.	difference
C.	product
D.	quotient
Answer» B. difference

Discussion

936.	The bandwidth ________ in a multistage amplifier compared to an identical single-stage amplifier.
A.	increases
B.	decreases
C.	remains the same
D.	None of the above
Answer» C. remains the same

Discussion

937.	is ________ than in a common-base configuration.
A.	significantly smaller
B.	smaller
C.	significantly greater
D.	None of the above
Answer» D. None of the above

Discussion

938.	The ________ amplifier is the most widely used constant-gain amplifier circuit.
A.	inverting
B.	noninverting
C.	differential
D.	None of the above
Answer» B. noninverting

Discussion

939.	The maximum frequency at which an op-amp may operate depends on the ________.
A.	bandwidth (BW)
B.	slew rate (SR)
C.	unity-gain bandwidth
D.	All of the above
Answer» E.

Discussion

940.	An IC unit containing a differential amplifier built using both bipolar and FET transistors is referred to as a ________ circuit.
A.	CMOS
B.	BiFET
C.	BiMOS
D.	None of the above
Answer» C. BiMOS

Discussion

941.	Ideally, the value of the CMRR is ________. Practically, the ________ the value of CMRR, the better the circuit operation.
A.	zero, smaller
B.	infinite, larger
C.	zero, larger
D.	infinite, smaller
Answer» C. zero, larger

Discussion

942.	As the frequency increases, the input impedance of an op-amp ________ and the output impedance ________.
A.	increases, increases
B.	increases, decreases
C.	decreases, decreases
D.	decreases, increases
Answer» D. decreases, increases

Discussion

943.	When both input signals are the same, a common signal element due to the two inputs can be defined as the ________ of the two signals.
A.	difference
B.	sum
C.	average of the sum
D.	product
Answer» D. product

Discussion

944.	The feedback component of an integrator is a(n) ________.
A.	resistor
B.	capacitor
C.	inductor
D.	diode
Answer» C. inductor

Discussion

945.	The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________.
A.	CMRR
B.	common-mode gain
C.	closed-loop gain
D.	open-loop gain
Answer» D. open-loop gain

Discussion

946.	Negative feedback decreases the bandwidth and increases the voltage gain.
A.	True
B.	False
Answer» C.

Discussion

947.	What is the ratio IP / IV for gallium arsenide?
A.	1:1
B.	5:1
C.	10:1
D.	20:1
Answer» E.

Discussion

948.	A VCO is a variable capacitance oscillator.
A.	True
B.	False
Answer» C.

Discussion

949.	Amplitude modulation is the process of varying the radio frequency with the modulating frequency.
A.	True
B.	False
Answer» C.

Discussion

950.	As the supply voltage increases, the voltage gain of the circuit ________ and the power consumption ________.
A.	increases, increases
B.	increases, decreases
C.	decreases, decreases
D.	decreases, increases
Answer» B. increases, decreases

Discussion

Explore topic-wise MCQs in Engineering.

The PIV rating of power diodes can be increased by stacking the diodes in series.

What are the typical ranges of reverse-bias current levels IS for low-power and high-power Schottky diodes at room temperature?

The magnitude of the third harmonic is ________ of the magnitude of the fundamental.

The ________ region produces the maximum voltage gain in a single-stage BJT or FET amplifier.

The resistance associated with the 1-mW power level is ________ , chosen because it is the characteristic impedance of audio transmission lines.

An inverting amplifier has an input impedance equal to the feedback resistor Rf.

Closed-loop gain is the gain with negative feedback.

An ideal op-amp circuit has ________input impedance, ________ output impedance, and ________ voltage gain.

An IC unit containing a differential amplifier built using opposite-type MOSFET transistors is referred to as a ________ circuit.

An input applied to either input terminal will result in ________.

A ________ differential amplifier is particularly well suited for battery operation due to its low power consumption.

In double-ended (differential) input operation, ________.

If two opposite-polarity input signals are applied, the operation is referred to as ________.

If the same input is applied to both inputs, the operation is called ________.

In a differential amplifier circuit, if an input signal is applied to either input with the other input connected to ground, the operation is referred to as ________.

All practical op-amps have input bias currents and voltages that produce output error voltages.

When the open-loop gain of an op-amp is reduced by negative feedback, the bandwidth is increased.

The decibel (dB) is defined such that ________ decibel(s) = ________ bel(s).

Logarithms taken to the base ________ are referred to as common logarithms, while logarithms taken to the base ________ are referred to as natural logarithms.

A change in frequency by a factor of 10 results in a ________ change in the ratio of the normalized gain.

The logarithm of a number ________ than 1 is always ________.

The ________ in the Fourier series has the same frequency as the square wave itself.

Open-loop gain of an op-amp is the voltage gain without feedback.

Open-loop gain is always smaller than closed-loop gain.

The common-mode rejection ratio (CMRR) is a measure of an op-amp's ability to reject common-mode input signals.

The ________ of the upper cutoff frequencies defines a ________ possible bandwidth for a system.

At very high frequencies, the effect of Ci is to ________ the total impedance of the parallel combination of R1, R2, R3, and Ci.

A change in frequency by a factor of 2 results in a ________ change in the ratio of the normalized gain.

With a BJT amplifier in the high-frequency region, the capacitance Cbe is the ________ of the parasitic capacitances while Cce is the ________.

In the input RC circuit of a single-stage BJT or FET amplifier, as the frequency ________, the capacitive reactance ________ and ________ of the input voltage appears across the output terminals.

The ________ configuration displays improved high-frequency characteristics over the ________ configuration.

In the low-frequency region, the ________ low-frequency cutoff determined by CS, CC, or CE will have the greatest impact on the network.

For two identical stages in cascade, the drop-off rate in the high- and low-frequency regions has increased to ________ per decade.

Voltage gains of ________ dB or higher should immediately be recognized as being quite high.

The decibel gain of a cascaded system is the ________ of the decibel gains of each stage.

The bandwidth ________ in a multistage amplifier compared to an identical single-stage amplifier.

is ________ than in a common-base configuration.

The ________ amplifier is the most widely used constant-gain amplifier circuit.

The maximum frequency at which an op-amp may operate depends on the ________.

An IC unit containing a differential amplifier built using both bipolar and FET transistors is referred to as a ________ circuit.

Ideally, the value of the CMRR is ________. Practically, the ________ the value of CMRR, the better the circuit operation.

As the frequency increases, the input impedance of an op-amp ________ and the output impedance ________.

When both input signals are the same, a common signal element due to the two inputs can be defined as the ________ of the two signals.

The feedback component of an integrator is a(n) ________.

The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________.

Negative feedback decreases the bandwidth and increases the voltage gain.

What is the ratio IP / IV for gallium arsenide?

A VCO is a variable capacitance oscillator.

Amplitude modulation is the process of varying the radio frequency with the modulating frequency.

As the supply voltage increases, the voltage gain of the circuit ________ and the power consumption ________.

An ideal op-amp circuit has input impedance, output impedance, and voltage gain.

The decibel (dB) is defined such that decibel(s) = bel(s).

Logarithms taken to the base are referred to as common logarithms, while logarithms taken to the base are referred to as natural logarithms.

The logarithm of a number than 1 is always .

The of the upper cutoff frequencies defines a possible bandwidth for a system.

With a BJT amplifier in the high-frequency region, the capacitance Cbe is the of the parasitic capacitances while Cce is the .

In the input RC circuit of a single-stage BJT or FET amplifier, as the frequency , the capacitive reactance and of the input voltage appears across the output terminals.

The configuration displays improved high-frequency characteristics over the configuration.

Ideally, the value of the CMRR is . Practically, the the value of CMRR, the better the circuit operation.

As the frequency increases, the input impedance of an op-amp and the output impedance .

As the supply voltage increases, the voltage gain of the circuit and the power consumption .