Explore topic-wise MCQs in Engineering.

This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

51.

A common-drain amplifier is similar in configuration to which BJT amplifier?
A. common-emitter
B. common-collector
C. common-base
D. common-gate
Answer» C. common-base
Discussion
52.

Referring to this figure, calculate Av for yos = 58 S.

A. 7.29
B. 7.50
C. 8.05
D. 8.55
Answer» B. 7.50
Discussion
53.

Refer to this figure. If Vin = 1 V p-p, the output voltage Vout would be
A. undistorted.
B. clipped on the negative peaks.
C. clipped on the positive peaks.
D. 0 V p-p.
Answer» B. clipped on the negative peaks.
Discussion
54.

logea = ________ log10a
A. 2.3
B. 2.718
C. e
D. 1.414
Answer» B. 2.718
Discussion
55.

What is the ratio of the common logarithm of a number to its natural logarithm?
A. 0.435
B. 2
C. 2.3
D. 3.2
Answer» D. 3.2
Discussion
56.

In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage for frequencies much larger than the cutoff frequency in the low-frequency region?
A. About 0
B. 45
C. About 90
D. None of the above
Answer» B. 45
Discussion
57.

In the ________-frequency region, the capacitive elements of importance are the interelectrode (between terminals) capacitances internal to the active device and the wiring capacitance between the leads of the network.
A. low
B. mid
C. high
Answer» D.
Discussion
58.

Which of the following elements is (are) important in determining the gain of the system in the high-frequency region?
A. Interelectrode capacitances
B. Wiring capacitances
C. Miller effect capacitance
D. All of the above
Answer» E.
Discussion
59.

The input power to a device is 10,000 W at 1000 V. The output power is 500 W, and the output impedance is 100 . Find the voltage gain in decibels.
A. 30.01 dB
B. 20.0 dB
C. 13.01 dB
D. 3.01 dB
Answer» D. 3.01 dB
Discussion
60.

In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage at the cutoff frequency in the low-frequency region?
A. About 0
B. 45
C. About 90
D. None of the above
Answer» C. About 90
Discussion
61.

Which of the low-frequency cutoffs determined by CS, CC, or CE will be the predominant factor in determining the low-frequency response for the complete system?
A. lowest
B. middle
C. highest
D. None of the above
Answer» D. None of the above
Discussion
62.

By what factor does an audio level change if the power level changes from 4 W to 4096 W?
A. 2
B. 4
C. 6
D. 8
Answer» D. 8
Discussion
63.

Refer to the given figure. The midrange voltage gain of this amplifier is
A. 0.5.
B. 27.7.
C. 11.
D. 1.
Answer» E.
Discussion
64.

This circuit is an example of a ________.

A. single-ended input
B. double-ended (differential) input
C. double-ended output
D. common-mode operation
Answer» C. double-ended output
Discussion
65.

A(n) ________ amplifier configuration has a higher input impedance and a lower output impedance than the op-amp itself.
A. non-inverting
B. inverting
C. voltage-follower
Answer» B. inverting
Discussion
66.

In which of the following operations is the resulting output signal of the differential amplifier near zero?
A. Single-ended
B. Double-ended
C. Common-mode
D. None of the above
Answer» D. None of the above
Discussion
67.

A three-stage op-amp can have a maximum phase lag of ________ .
A. 180
B. 90
C. 270
D. none of the above
Answer» D. none of the above
Discussion
68.

Calculate the output impedance of an inverting op-amp using the 741 op-amp (ro = 75 , AOL = 200 V/mV) if R1 = 100 and Rf = 1 k.
A. 0.011
B. 0.00375
C. 0.0375
D. 0.375
Answer» C. 0.0375
Discussion
69.

The input offset voltage drift is a parameter directly related to VOS and ________.
A. I
B. <sub>D</sub>
C. power dissipation
D. temperature
E. phase shift
Answer» D. temperature
Discussion
70.

What is the difference voltage if the inputs are an ideal opposite signal?
A. The differential gain times twice the input signal.
B. The differential gain times the input signal.
C. The common-mode gain times twice the input signal.
D. The common-mode gain times the input signal.
Answer» B. The differential gain times the input signal.
Discussion
71.

Refer to the given figure. Determine the bandwidth.
A. 1 MHz
B. 1.5 MHz
C. 1 kHz
D. 1.5 kHz
Answer» C. 1 kHz
Discussion
72.

Refer to the given figure. This amplifier is known as
A. an inverting amplifier.
B. a non-inverting amplifier.
C. a voltage-follower.
D. a common-source amplifier.
Answer» B. a non-inverting amplifier.
Discussion
73.

Refer to the given figure. The op-amp has a unity-gain bandwidth of 3 MHz. Determine the BW of the circuit.
A. 3 MHz
B. 30 kHz
C. 112.4 kHz
D. infinite in width
Answer» D. infinite in width
Discussion
74.

A practical op-amp has very ________ input impedance, very ________ output impedance, very ________ open-loop voltage gain, and a ________ bandwidth.
A. high, low, high, wide
B. high, high, low, narrow
C. low, high, high, wide
D. low, low, low, wide
Answer» B. high, high, low, narrow
Discussion
75.

This circuit is referred to as a(n) ________.

A. inverting amplifier
B. noninverting amplifier
C. unity follower
D. integrator
Answer» B. noninverting amplifier
Discussion
76.

This circuit is an example of a ________.

A. single-ended input
B. double-ended (differential) input
C. double-ended output
D. common-mode operation
Answer» D. common-mode operation
Discussion
77.

What is the level of the roll-off in most op-amps?
A. 6 dB / decade
B. 20 dB / octave
C. 6 dB / decade or 20 dB / octave
D. 20 dB / decade or 6 dB / octave
Answer» E.
Discussion
78.

Refer to the given figure. This amplifier is known as
A. an inverting amplifier.
B. a non-inverting amplifier.
C. a voltage-follower.
D. a common-source amplifier.
Answer» D. a common-source amplifier.
Discussion
79.

Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV.

A. 1.5 V
B. 1.5 V
C. 0.5 V
D. 0.5 V
Answer» B. 1.5 V
Discussion
80.

If Rf = R1, the voltage gain is ________.

A. 1
B. 1
C. 10
D. very small
Answer» C. 10
Discussion
81.

The maximum rate of change of the output voltage in response to a step input voltage is the ________ of an op-amp.
A. time constant
B. maximum frequency
C. slew rate
D. static discharge
Answer» D. static discharge
Discussion
82.

An RC network has R = 47 k and C = 0.22 F. What is the cutoff frequency?
A. 154 Hz
B. 1540 Hz
C. 1.54 Hz
D. 15.4 Hz
Answer» E.
Discussion
83.

A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
A. 51.7 dB
B. 103.5 dB
C. 150,000 dB
D. 5.18 dB
Answer» C. 150,000 dB
Discussion
84.

An IC unit made using both ________ and ________ transistors is called a ________ circuit.
A. bipolar, MOSFET, BiFET
B. bipolar, MOSFET, BiMOS
C. TTL, MOSFET, TailFET
Answer» C. TTL, MOSFET, TailFET
Discussion
85.

What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms?
A. 5 V/ms
B. 3 V/ms
C. 2 V/ms
D. 1 V/ms
Answer» B. 3 V/ms
Discussion
86.

The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations.
A. non-inverting
B. inverting
C. voltage-follower
Answer» D.
Discussion
87.

This circuit is referred to as a(n) ________.

A. inverting amplifier
B. noninverting amplifier
C. differentiator
D. integrator
Answer» E.
Discussion
88.

Refer to the given figure. Calculate the bandwidth.
A. 8.33 MHz
B. 833 kHz
C. 83.3 kHz
D. 8.33 kHz
Answer» D. 8.33 kHz
Discussion
89.

Refer to this figure. The purpose of R4 is
A. for bias current compensation.
B. for input offset voltage compensation.
C. to set input impedance.
D. to set input impedance and voltage gain.
Answer» C. to set input impedance.
Discussion
90.

Refer to the given figure. Find the midrange gain of this amplifier.
A. 26.7
B. 26.7
C. 27.7
D. 27.7
Answer» C. 27.7
Discussion
91.

The summing amplifier contains an inverting amplifier.
A. True
B. False
Answer» B. False
Discussion
92.

What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?
A. 200,000
B. 50,000
C. 200
D. 1
Answer» E.
Discussion
93.

Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k.

A. 1
B. 10
C. 11
D. 9
Answer» D. 9
Discussion
94.

Refer to the given figure. A dc input signal of 50 mV is applied. You would measure ________ from the inverting input to ground.
A. 50 mV
B. 1.05 V
C. 1.05 V
D. 50 mV
Answer» E.
Discussion
95.

What is the level of the voltage between the input terminals of an op-amp?
A. Virtually zero
B. 5 V
C. 18 V
D. 22 V
Answer» B. 5 V
Discussion
96.

An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
A. 10 dB.
B. 6 dB.
C. 20 dB.
D. 3 dB.
Answer» D. 3 dB.
Discussion
97.

What is the difference output voltage of any signals applied to the input terminals?
A. The differential gain times the difference input voltage.
B. The common-mode gain times the common input voltage.
C. The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
D. The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
Answer» D. The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
Discussion
98.

An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
A. 800
B. 8,000
C. 80,000
D. 100,000
Answer» E.
Discussion
99.

For audio systems, the reference level is generally accepted as ________.
A. 1 mW
B. 1 W
C. 10 mW
D. 100 mW
Answer» B. 1 W
Discussion
100.

What is the range of the capacitors Cgs and Cgd?
A. 1 to 10 pF
B. 1 to 10 nF
C. 1 to 10 F
D. 1 to 10 F
Answer» B. 1 to 10 nF
Discussion