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.

201.

An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector)

A. 8.92 V
B. 112 mV
C. 12 mV
D. 8.9 mV
Answer» D. 8.9 mV
Discussion
202.

What is the limit of the efficiency defined by = Po / Pi?

A. Greater than 1
B. Less than 1
C. Always 1
D. None of the above
Answer» C. Always 1
Discussion
203.

The loaded voltage gain of an amplifier is always more than the no-load level.

A. True
B. False
Answer» C.
Discussion
204.

For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.

A. voltage
B. current
C. impedance
D. All of the above
Answer» C. impedance
Discussion
205.

Which of the following is (are) true regarding the input impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?

A. The input impedance is purely resistive.
B. It varies from a few ohms to megohms.
C. An ohmmeter cannot be used to measure the small-signal ac input impedance.
D. All of the above
Answer» E.
Discussion
206.

For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.

A. 0
B. 45
C. 90
D. 180
Answer» E.
Discussion
207.

A common-collector amplifier has ________ input resistance, ________ current gain, and ________ voltage gain.

A. high, high, low
B. high, low, low
C. high, low, high
Answer» B. high, low, low
Discussion
208.

The total gain of a multistage amplifier is the ________.

A. sum of individual voltage gains
B. sum of dB voltage gains
Answer» C.
Discussion
209.

Which of the following define(s) the conversion efficiency?

A. Ac power to the load/ac input power
B. Ac power to the load/dc power supplied
C. Dc output power/ac input power
D. All of the above
Answer» C. Dc output power/ac input power
Discussion
210.

Which of the following should be done to obtain the ac equivalent of a network?

A. Set all dc sources to zero
B. Replace all capacitors by a short-circuit equivalent.
C. Remove all elements bypassed by the short-circuit equivalent.
D. All of the above
Answer» E.
Discussion
211.

Which of the following configurations has an output impedance Zo equal to RC?

A. Fixed-bias common-emitter
B. Common-emitter voltage-divider with bypass capacitor
C. Common-emitter voltage-divider without bypass capacitor
D. All of the above
Answer» E.
Discussion
212.

What is the VRRM (PIV rating) for the 1N4001 rectifier diode?

A. 50 V
B. 100 V
C. 200 V
D. 400 V
E. none of the above
Answer» B. 100 V
Discussion
213.

What type of diode circuit is used to add or restore a dc level to an electrical signal?

A. clipper or limiter
B. clamper
C. IC voltage regulator
D. none of the above
Answer» C. IC voltage regulator
Discussion
214.

PIV is which of the following?

A. peak input voltage
B. peak inverse voltage
C. peak immediate voltage
D. positive input voltage
Answer» C. peak immediate voltage
Discussion
215.

Determine the peak value of the current through the load resistor.

A. 2.325 mA
B. 5 mA
C. 1.25 mA
D. 0 mA
Answer» B. 5 mA
Discussion
216.

Determine the peak value of the output waveform.

A. 25 V
B. 15 V
C. 25 V
D. 15 V
Answer» C. 25 V
Discussion
217.

In a regulated supply, what term describes how much change occurs in the output voltage for a given change in the input voltage?

A. load regulation
B. voltage regulator
C. line regulation
D. ripple voltage
Answer» D. ripple voltage
Discussion
218.

Refer to the figure given below. Which diode arrangement will supply a negative output voltage?

A. a
B. b
C. c
D. d
Answer» D. d
Discussion
219.

Refer to the figure given below. The probable trouble, if any, indicated by these voltages is

A. one of the diodes is open.
B. a diode is shorted.
C. an open transformer secondary.
D. the filter capacitor is shorted.
E. no trouble exists.
Answer» E. no trouble exists.
Discussion
220.

Which diode(s) has (have) a zero level current and voltage drop in the ideal model?

A. Si
B. Ge
C. Both Si and Ge
D. Neither Si nor Ge
Answer» D. Neither Si nor Ge
Discussion
221.

Determine Vo if E1 = E2 = 10 V.

A. 9.3 V
B. 10 V
C. 10 V
D. 0 V
Answer» C. 10 V
Discussion
222.

Use the information provided here to determine the value of IDQ.

A. 0 mA
B. 4.3 mA
C. 5 mA
D. 10 mA
Answer» C. 5 mA
Discussion
223.

If the ac supply is 60 Hz, what will be the ripple frequency out of the half-wave rectifier?

A. 30 Hz
B. 50 Hz
C. 60 Hz
D. 120 Hz
Answer» D. 120 Hz
Discussion
224.

Calculate IL and IZ.

A. 2 mA, 0 mA
B. 4 mA, 2 mA
C. 2 mA, 2 mA
D. 2 mA, 4 mA
Answer» E.
Discussion
225.

How many terminals do the 7800 series fixed positive voltage regulators have?

A. 2
B. 3
C. 4
D. 5
E. none of the above
Answer» C. 4
Discussion
226.

Determine ICQ at a temperature of 175 C if ICQ = 2 mA at 25 C for RB / RE = 20 due to the S() stability factor.

A. 2.417 mA
B. 2.392 mA
C. 2.25 mA
D. 2.58 mA
Answer» B. 2.392 mA
Discussion
227.

Calculate ETh for this network.

A. 12.12 V
B. 16.35 V
C. 3.65 V
D. 10 V
Answer» D. 10 V
Discussion
228.

At what region of operation is the base-emitter junction forward biased and the base-collector junction reverse biased?

A. Saturation
B. Linear or active
C. Cutoff
D. None of the above
Answer» C. Cutoff
Discussion
229.

In the case of this circuit, you must assume that VE = 0.1 VCC in order to calculate RC and RE.

A. True
B. False
Answer» B. False
Discussion
230.

Which of the following is (are) related to an emitter-follower configuration?

A. The input and output signals are in phase.
B. The voltage gain is slightly less than 1.
C. Output is drawn from the emitter terminal.
D. All of the above
Answer» E.
Discussion
231.

It is desirable to design a bias circuit that is independent of the transistor beta.

A. True
B. False
Answer» B. False
Discussion
232.

The saturation region is defined by VCE ________ VCEsat.

A. >
B. <
C. <img src="/_files/images/electronic-devices-and-circuit-theory/lessthanorequalto.gif">
D. <img src="/_files/images/electronic-devices-and-circuit-theory/greaterthanorequalto.gif">
Answer» D. <img src="/_files/images/electronic-devices-and-circuit-theory/greaterthanorequalto.gif">
Discussion
233.

What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?

A. clipper or limiter
B. clamper
C. IC voltage regulator
D. none of the above
Answer» B. clamper
Discussion
234.

Each diode in a center-tapped full-wave rectifier is ________ -biased and conducts for ________ of the input cycle.

A. forward, 90
B. reverse, 180
C. forward, 180
D. reverse, 90
Answer» D. reverse, 90
Discussion
235.

What is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer?

A. 10 V
B. 20 V
C. 10 V
D. 20 V
Answer» C. 10 V
Discussion
236.

Calculate VCE.

A. 4.52 V
B. 4.52 V
C. 9 V
D. 9 V
Answer» C. 9 V
Discussion
237.

For the BJT to operate in the active (linear) region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased.

A. forward, forward
B. forward, reverse
C. reverse, reverse
D. reverse, forward
Answer» C. reverse, reverse
Discussion
238.

The cutoff region is defined by IB ________ 0 A.

A. >
B. <
C. <img src="/_files/images/electronic-devices-and-circuit-theory/lessthanorequalto.gif">
D. <img src="/_files/images/electronic-devices-and-circuit-theory/greaterthanorequalto.gif">
Answer» D. <img src="/_files/images/electronic-devices-and-circuit-theory/greaterthanorequalto.gif">
Discussion
239.

Determine the reading on the meter when VCC = 20 V, RC = 5 k, and IC = 2 mA.

A. 10 V
B. 10 V
C. 0.7 V
D. 20 V
Answer» B. 10 V
Discussion
240.

Refer to the given figure. The unity-gain bandwidth of this op-amp is 10.4 kHz. What is the bandwidth of the circuit?

A. 10.4 kHz
B. 15.5 kHz
C. 3 MHz
D. 16.7 kHz
Answer» B. 15.5 kHz
Discussion
241.

Which of the following is (are) the result of gain reduction by a feedback?

A. The amplifier voltage gain is a more stable and precise value.
B. The input impedance of the circuit is increased over that of the op-amp alone.
C. The output impedance is reduced over that of the op-amp alone.
D. All of the above
Answer» E.
Discussion
242.

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

A. inverting amplifier
B. noninverting amplifier
C. differentiator
D. integrator
Answer» D. integrator
Discussion
243.

Refer to the given figure. Find the midrange gain of this op-amp amplifier.

A. 10
B. 11
C. 10
D. 11
Answer» C. 10
Discussion
244.

What is the level of the current through the amplifier input(s) to ground in an op-amp?

A. Virtually zero
B. 1.7 mA
C. 2.8 mA
D. 3.3 mA
Answer» B. 1.7 mA
Discussion
245.

What is the difference voltage if the inputs are an ideal in-phase 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» E.
Discussion
246.

Refer to this figure. The purpose of R1 and R2 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» E.
Discussion
247.

Refer to the given figure. If an input signal of 0.5 V were applied, determine the output voltage.

A. 5 V
B. 5 V
C. 10 V
D. 10 V
Answer» C. 10 V
Discussion
248.

Calculate the input voltage if R1 = 100 , Rf = 1 k, and Vout = 550 mV.

A. 50 mV
B. 5 mV
C. 550 mV
D. 50 mV
Answer» E.
Discussion
249.

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» C. a voltage-follower.
Discussion
250.

Refer to the given figure. The voltage gain of this amplifier is

A. 100.
B. 5.
C. 20.
D. 21.
Answer» E.
Discussion