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.

2401.

In figure, V0 =

A. -1 V
B. 2 V
C. +1 V
D. +15 V
Answer» C. +1 V
Discussion
2402.

A 741 type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a -3dB bandwidth of

A. 50 kHz
B. 100 kHz
C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/332-514-1.png">
D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/332-514-2.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/332-514-1.png">
Discussion
2403.

In a capacitor filter, the time constant RLC should be small.

A. True
B. False
Answer» C.
Discussion
2404.

In a self bias circuit for CE amplifier, an increase in emitter resistance RE results in

A. increase in emitter voltage
B. decrease in emitter voltage
C. increase in emitter current
D. decrease in emitter current
Answer» E.
Discussion
2405.

For a BJT if = 50, ICEO = 3 A and IC = 1.2 mA then IE

A. 1 mA
B. 1.2 mA
C. 1.3 mA
D. 1.4 mA
Answer» C. 1.3 mA
Discussion
2406.

In the CE circuit shown in figure the slope of ac load line will be

A. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/309-129-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/309-129-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/309-129-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/309-129-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/309-129-4.png">
Discussion
2407.

When the circuit is switched on, the loop gain of a Wien bridge oscillator is

A. 1
B. more than 1
C. less than 1
D. about 0.5
Answer» C. less than 1
Discussion
2408.

The op-amp circuit shown in the figure is a filter. The type of filter and its cut off type of filter and its cut off frequency are respectively.

A. high Pass, 1000 rad/sec
B. low Pass, 100 rad/sec
C. high Pass, 10000 rad/sec
D. low pass, 10000 rad/sec
Answer» B. low Pass, 100 rad/sec
Discussion
2409.

In figure, V0 =

A. zero
B. 5.7 V
C. 6.9 V
D. 12.6 V
Answer» D. 12.6 V
Discussion
2410.

In the op-amp circuit of figure, V0 =

A. 10 V
B. -10 V
C. 5 V
D. -5 V
Answer» C. 5 V
Discussion
2411.

In figure the zener has a resistance of 5 ohms. As the load resistance is varied, the output voltage

A. will remain constant at 12 V
B. will vary between 12.05 and 12.65 V
C. will vary from 10 to 20 V
D. will remain constant at 12.05 V
Answer» C. will vary from 10 to 20 V
Discussion
2412.

A circuit using an op-amp is shown in the given figure. It has

A. voltage series feedback
B. voltage shunt feedback
C. current shunt feedback
D. current series feedback
Answer» C. current shunt feedback
Discussion
2413.

Assertion (A): In CE amplifier the emitter is at ground potential for ac signalsReason (R): A CE amplifier has near unity voltage gain

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» D. A is wrong R is correct
Discussion
2414.

Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25 C to 50 C

A. 50%
B. 500%
C. 565.7%
D. 575.6%
Answer» D. 575.6%
Discussion
2415.

An oscillator requires an amplifier

A. with negative feedback
B. with positive feedback
C. with either positive or negative feedback
D. none of the above
Answer» C. with either positive or negative feedback
Discussion
2416.

A full wave bridge diode rectifier uses diodes having forward resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulations is

A. 20%
B. 50%
C. 100%
D. 200%
Answer» E.
Discussion
2417.

The disadvantage of direct coupled amplifiers is

A. drift
B. large size of transistor
C. low voltage gain
D. both (b) and (c)
Answer» B. large size of transistor
Discussion
2418.

The units of transistor h parameters h11 and h22 are the same.

A. True
B. False
Answer» C.
Discussion
2419.

Positive feedback is mainly used in

A. oscillators
B. thyristors
C. voltage regulators
D. both (a) and (b)
Answer» E.
Discussion
2420.

The main application of enhancement mode MOSFET is in

A. amplifier circuits
B. oscillator circuits
C. switching circuits
D. all of the above
Answer» D. all of the above
Discussion
2421.

For a BJT if = 50, ICEO = 3 A and IC = 1.2 mA then IB

A. 24 A
B. 23 A
C. 20 A
D. 10 A
Answer» B. 23 A
Discussion
2422.

In figure, ID = 4 mA. Then VD =

A. 20 V
B. 10 V
C. 30 V
D. 1 V
Answer» C. 30 V
Discussion
2423.

A transistor has a power rating of 8 W for a case temperature of 25 C. If derating factor is 30 mW/ C, the power rating for 55 C, case temperature is

A. 8 W
B. 7.5 W
C. 7.1 W
D. 6.8 W
Answer» D. 6.8 W
Discussion
2424.

In figure VBE = 0.7 V. The base current is

A. above 97 A
B. about 97 mA
C. about 75 A
D. about 75 mA
Answer» B. about 97 mA
Discussion
2425.

The ripple factor of a half wave rectifier is more than 2.

A. True
B. False
Answer» C.
Discussion
2426.

Assertion (A): The circuit in figure produces repetitive narrow pulses when input is fed with sine or triangular waveform having peak value more than + VReason (R): The high gain op-amp produces voltages at two levels. If input is more than + V, the output is + 15 V otherwise the output is - 15 V.

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» B. Both A and R are correct but R is not correct explanation for A
Discussion
2427.

In a CE amplifier drives a low load resistance directly the result will be

A. overloading of amplifier
B. underloading of amplifier
C. overloading or underloading of amplifier depending on circuit
D. none of the above
Answer» B. underloading of amplifier
Discussion
2428.

For CE amplifier of figure, the slope of ac load line is

A. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/327-432-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/327-432-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/327-432-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/327-432-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/327-432-3.png">
Discussion
2429.

For high frequencies a capacitor like

A. an open circuit
B. a short circuit
C. either open circuit or short circuit
D. none of the above
Answer» C. either open circuit or short circuit
Discussion
2430.

The dissipation at the collector is in the quiescent state and increases with excitation in the case of a

A. class A series fed Amplifier
B. class A transistor coupled Amplifier
C. class AB amplifier
D. class B amplifier
Answer» E.
Discussion
2431.

In following circuit, RB will be if VCC = 10 V, VS = 2 V, RC = 5 k&amp;ohm;, RS = 90 k&amp;ohm;, = 50, ICE = 0, VCEsat = 0.1 V

A. 230 K
B. 235 K
C. 240 K
D. 250 K
Answer» C. 240 K
Discussion
2432.

The open loop gain of an ideal op-amp is

A. infinite
B. very high
C. neither high nor low
D. low
Answer» B. very high
Discussion
2433.

In following figure, what will be R1 and R2 for maximum symmetrical swing if VCSat 0. Given that RE = 200 &amp;ohm;, RC = 400 &amp;ohm;, VCC = 20 V, = 99

A. 6 k
B. 3 k, 6 k
C. 9.9 k, 2.4 k
D. 2.4 k, 9.9 k
Answer» E.
Discussion
2434.

The ideal characteristics of a stabilizer is

A. constant output voltage with low internal resistance
B. constant output current with low internal resistance
C. constant output voltage with high internal resistance
D. constant internal resistance and constant output current
Answer» B. constant output current with low internal resistance
Discussion
2435.

In an amplifier the voltage gain is the ratio of

A. output voltage and emitter resistance
B. output voltage and input current
C. output voltage and input voltage
D. none of the above
Answer» D. none of the above
Discussion
2436.

Find resistance RB to bring transistor to threshold of saturation VCB = 0, VBE = 0.7 V, a = 0.96

A. 1.5 k&ohm;
B. 15 k&ohm;
C. 10 k&ohm;
D. 1 k&ohm;
Answer» B. 15 k&ohm;
Discussion
2437.

In figure ID = 4 mA. Then VGS =

A. 4.4 V
B. -4.4 V
C. 0.44 V
D. -0.44 V
Answer» C. 0.44 V
Discussion
2438.

The critical frequency of the circuit of figure is

A. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/324-390-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/324-390-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/324-390-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/324-390-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/324-390-4.png">
Discussion
2439.

A typical value of gm for a FET is about 25 s.

A. True
B. False
Answer» C.
Discussion
2440.

The value of parameter re used in re transistor model

A. increases with increase in temperature
B. decreases with increase in temperature
C. is not affected by increase in temperature
D. either (b) or (c)
Answer» B. decreases with increase in temperature
Discussion
2441.

Assertion (A): In a full wave rectifier output the lowest ac component is at twice the input frequencyReason (R): In a full wave rectifier, the output waveform consists of half sinusoids

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
2442.

An op-amp has zero gain for common mode inputs. Then CMRR =

A. zero
B. infinite
C. high
D. low
Answer» C. high
Discussion
2443.

Assertion (A): Negative feedback reduces the bandwidth of an amplifier Reason (R): Negative feedback stabilizes the gain of an amplifier

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» E.
Discussion
2444.

In a half wave diode rectifier circuit the current flows in the load circuit for

A. 90 in each cycle
B. 180 in each cycle
C. 270 in each cycle
D. 360 in each cycle
Answer» C. 270 in each cycle
Discussion
2445.

An ideal op-amp has zero slew rate.

A. True
B. False
Answer» C.
Discussion
2446.

In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

A. 7.07 V
B. 14.14 V
C. 10 V
D. 28.28 V
Answer» C. 10 V
Discussion
2447.

In a push pull circuit

A. each transistor conducts for 180
B. each transistor conducts for more than 180 but less than 360
C. each transistor conducts for less than 180
D. the period of conduction of each transistor depends on circuit configuration
Answer» B. each transistor conducts for more than 180 but less than 360
Discussion
2448.

A transistor with a = 0.9 and ICBO = 10 A is biased so that IBQ = 90 A. Then IEQ will be

A. 5.15 mA
B. 5.2 mA
C. 5 mA
D. 990 mA
Answer» E.
Discussion
2449.

Which of the following power amplifiers has highest efficiency?

A. Class A
B. Class AB
C. Class B
D. Class C
Answer» E.
Discussion
2450.

A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions

A. Output voltage of bridge rectifier
B. Output voltage of bridge rectifier will be more than that of other
C. Output voltage of both will be exactly equal
D. Output voltage of any one may be more than that of other
Answer» B. Output voltage of bridge rectifier will be more than that of other
Discussion