Explore topic-wise MCQs in Engineering.

This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

1651.

Assertion (A): In Darlington pair, the overall is product of individual sReason (R): The voltage gain of a base driven amplifier is equal to ac collector voltage divided by ac base voltage

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct
Answer» C. A is correct R is wrong
Discussion
1652.

A cascade amplifier will have higher cut off frequency

A. equal to that of single stage amplifier
B. less than that of single stage amplifier
C. more than that of single stage amplifier
D. none of these
Answer» C. more than that of single stage amplifier
Discussion
1653.

A Darlington circuit is obtained by connecting

A. two CB stages in cascade
B. two CE stages in cascade
C. a CE stages followed by CB stage
D. two emitter follower in cascade
Answer» B. two CE stages in cascade
Discussion
1654.

A Wien bridge oscillator uses Wien bridge for

A. tuning and phase shift
B. tuning
C. phase shift
D. either tuning or phase shift
Answer» B. tuning
Discussion
1655.

A CE amplifier has a high input signal. In the wave shape of emitter current

A. positive and negative half cycles will be symmetrical
B. positive half cycle will be elongated and negative half cycle will be compressed
C. positive half cycle will be compressed and negative half cycle will be elongated
D. the half cycles may be either elongated or compressed
Answer» C. positive half cycle will be compressed and negative half cycle will be elongated
Discussion
1656.

Two 3Ω speakers in series will have a total impedance of

A. 1 Ω
B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/350-837-1.png">
C. 3 &ohm;
D. 6 &ohm;
Answer» C. 3 &ohm;
Discussion
1657.

The input resistance Ri of the amplifier shown in the figure

A. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/333-521-2.png">
B. 100 k&ohm;
C. 40 k&ohm;
D.
Answer» C. 40 k&ohm;
Discussion
1658.

In a CE amplifier the ac signal is increased. Which of the following will not change?

A. Ac base voltage
B. Ac collector voltage
C. Ac emitter voltage
D. Ac collector voltage and ac emitter voltage
Answer» D. Ac collector voltage and ac emitter voltage
Discussion
1659.

Low frequency response of amplifier is mainly limited by

A. input capacitor
B. bypass capacitor
C. output capacitor
D. biasing capacitor
Answer» C. output capacitor
Discussion
1660.

The input differential stage of op-amp. 741 is baised at about 10 A current such a low current of the input stage gives high CMRRhigh differential gainlow differentialhigh input impedance Which of these are correct?

A. 1 and 2
B. 1, 2 and 4
C. 3 and 4
D. 1, 2, 3 and 4
Answer» C. 3 and 4
Discussion
1661.

IN 3242 is a

A. P-N-P transistor
B. N-P-N transistor
C. UJT
D. semi-conductor diode
Answer» E.
Discussion
1662.

With negative feedback the closed loop gain is always less than open loop gain.

A. True
B. False
Answer» B. False
Discussion
1663.

As compared to a bipolar transistor, a JFET is

A. highly sensitive to changes in input voltage
B. more sensitive to changes in input voltage
C. less sensitive to changes in input voltage
D. equally sensitive to changes in input voltage
Answer» D. equally sensitive to changes in input voltage
Discussion
1664.

The multivibrator circuit that has a typical application of converting sinusoidal input into a square wave output is

A. emitter coupled binary
B. Schmitt trigger
C. monoshot multivibrator
D. free-running multivibrator
Answer» C. monoshot multivibrator
Discussion
1665.

When narrow current pulses drive a high Q resonant circuit the voltage across the circuit looks like

A. narrow pulses
B. half sine wave
C. almost sine wave
D. either (a) or (b)
Answer» D. either (a) or (b)
Discussion
1666.

In a bistable multivibrator, commutating capacitors are used to

A. increase the base storage charge
B. provide ac coupling
C. increase the speed of response
D. alter the frequency of the output
Answer» D. alter the frequency of the output
Discussion
1667.

The feedback resistance rd in small signal model of MOSFET is of the order of

A. 1000 M&ohm;
B. 1 M&ohm;
C. 1 K&ohm;
D. 100 &ohm;
Answer» B. 1 M&ohm;
Discussion
1668.

Which amplifier has a voltage gain of less than 1?

A. Common emitter
B. Common collector
C. Common base
D. Both CB and CC
Answer» C. Common base
Discussion
1669.

The transconductance curve of a JFET is

A. a straight line
B. parabolic
C. hyperbolic
D. inverted V-type
Answer» C. hyperbolic
Discussion
1670.

The gate electrode in the FET corresponds to the

A. collector in a bipolar transistor
B. base in a bipolar transistor
C. emitter in a bipolar transistor
D. none of the above
Answer» C. emitter in a bipolar transistor
Discussion
1671.

The properties of JFET resemble those of

A. thermionic values
B. N-P-N transistors
C. P-N-P transistors
D. unijunction transistor
Answer» C. P-N-P transistors
Discussion
1672.

Assertion (A): Transformer coupling has the disadvantage of the weight of transformer and Saturation of coreReason (R): Transformer coupling is very suitable for impedance matching

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct
Answer» C. A is correct R is wrong
Discussion
1673.

A Hartley oscillator is used for generation

A. very low frequency oscillation
B. radio frequency oscillation
C. microwave oscillation
D. audio-frequency oscillation
Answer» E.
Discussion
1674.

One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be

A. sinusoidal
B. full rectified sinusoidal
C. half rectified sinusoidal
D. square wave
Answer» E.
Discussion
1675.

3N 200 is a

A. semi-conductor diode
B. P-N-P transistor
C. dual gate MOSFET
D. UJT
Answer» D. UJT
Discussion
1676.

In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.

A. True
B. False
Answer» B. False
Discussion
1677.

The A.C. resistance of the emitter diode will be

A. 5.05 &ohm;
B. 50.5 &ohm;
C. 505 &ohm;
D. 5050 &ohm;
Answer» C. 505 &ohm;
Discussion
1678.

For a transistor amplifier with self biasing network, the following components are used. R1 = 4 k&amp;ohm;, R2 = 4 k&amp;ohm;, RC = 1 k&amp;ohm;. The approximate value of the stability factor 'S' will be

A. 4
B. 3
C. 2
D. 1.5
Answer» C. 2
Discussion
1679.

Which of the following method cannot be used to increase the bandwidth for cascaded RF amplifier stages?

A. Wave traps in each stage
B. Stagger tuning
C. A shunt damping resistor across each tuned circuit
D. Doubled tuned transformers with tighter coupling
Answer» B. Stagger tuning
Discussion
1680.

The current ICBO flows in

A. base and emitter leads
B. base and collector leads
C. collector and emitter leads
D. collector, emitter and base leads
Answer» C. collector and emitter leads
Discussion
1681.

The h parameter h11 is the same in CE and CC circuit.

A. True
B. False
Answer» B. False
Discussion
1682.

The RC network of wein bridge oscillator consists of resistors and capacitors of values R = 220 k&amp;ohm; and C = 250 PF Determine the frequency of oscillation

A. 2.98 kHz
B. 3 kHz
C. 2 kHz
D. 10 kHz
Answer» B. 3 kHz
Discussion
1683.

In voltage amplifiers, the load resistance

A. should be a small as possible
B. should be as large as possible
C. must be equal to output impedance
D. must be half of output impedance
Answer» C. must be equal to output impedance
Discussion
1684.

In figure the dc load line will meet the y and x axis respectively at

A. 20 mA and 30 V
B. 15 mA and 20 V
C. 25 mA and 40 V
D. 10 mA and 20 V
Answer» B. 15 mA and 20 V
Discussion
1685.

In a class C operation VCC = 30 V and VCE(sat) = 2 V. The efficiency is

A. 93.75%
B. 88%
C. 6.66%
D. 3.33%
Answer» B. 88%
Discussion
1686.

In a transistor which of the following region is very lightly doped and is very thin?

A. Emitter
B. Base
C. Collector
D. None of the above
Answer» C. Collector
Discussion
1687.

The minimum value of hfe of a transistor used in RC phase shift oscillator is

A. 54.4
B. 45.4
C. 44.5
D. 29
Answer» D. 29
Discussion
1688.

Self bias is an example of __________ feedback that tends to stabilize the drain current against changes in temperature and JFET replacement.

A. variable
B. low
C. negative
D. positive
Answer» D. positive
Discussion
1689.

In the circuit shown in the given figure, the current flowing through resistance of 100 &amp;ohm; would be

A. 8 mA
B. 10 mA
C. 20 mA
D. 100 mA
Answer» B. 10 mA
Discussion
1690.

A sine wave is passed through an amplifier which severely limits it symmetrically. If then passes to a second amplifier which is narrow band and tuned to the frequency of the original sine wave. What will be the output wave from this second amplifier?

A. A square wave of the same frequency as that of the original sine wave
B. A square wave of double the frequency of that of original sine wave
C. A sine wave of constant amplitude at the frequency of the original sine wave
D. A sine wave of constant amplitude at double frequency of the original sine wave
Answer» D. A sine wave of constant amplitude at double frequency of the original sine wave
Discussion
1691.

In which configuration is ac collector voltage zero?

A. CE
B. CB
C. CC
D. none of the above
Answer» D. none of the above
Discussion
1692.

Which connection is rarely used?

A. CE
B. CB
C. CC
D. Both (a) and (b)
Answer» C. CC
Discussion
1693.

Assertion (A): The main use of positive feedback is in oscillator circuits.Reason (R): In an oscillator the loop gain A is kept slightly more than unity

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct
Answer» C. A is correct R is wrong
Discussion
1694.

Astable multivibrator has

A. one stable state
B. two stable state
C. two quasi-stable states
D. one quasi stable state
Answer» D. one quasi stable state
Discussion
1695.

Most small signal transistors are

A. N-P-N, silicon, in a plastic package
B. P-N-P, silicon, in a plastic package
C. N-P-N, germanium in a metallic case
D. P-N-P, germanium in a metallic case
Answer» B. P-N-P, silicon, in a plastic package
Discussion
1696.

A FET is a better clapper than a BJT because it has

A. lower off-set voltage
B. higher series ON resistance
C. lower input current
D. higher input impedance
Answer» B. higher series ON resistance
Discussion
1697.

The input gate current of FET is closer to

A. few amperes
B. few milli amperes
C. few microamperes
D. negligibly smaller value
Answer» E.
Discussion
1698.

When a 1 V increase in gate voltage changes the drain current 10 mA in an FET, its gm equals

A. 10
B. 100
C. 1000
D. 10000
Answer» E.
Discussion
1699.

In a CE amplifier, the collector resistance is 6 k&amp;ohm; and load resistance is 3 k&amp;ohm;. The ac load resistance is

A. 9 k&ohm;
B. 6 k&ohm;
C. 3 k&ohm;
D. 2 k&ohm;
Answer» E.
Discussion
1700.

A voltage tripler circuit uses

A. 2 diodes and 2 capacitors
B. 3 diodes and 3 capacitors
C. 2 diodes and 3 capacitors
D. 3 diodes and 2 capacitors
Answer» C. 2 diodes and 3 capacitors
Discussion