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.

2451.

Assume that op-amp in figure is ideal. If input Vi is triangular, the output V0 will be

A. square wave
B. sine wave
C. triangular wave
D. parabolic wave
Answer» B. sine wave
Discussion
2452.

In an amplifier with a gain of - 1000 and feedback factor = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be

A. 10%
B. 5%
C. 0.2%
D. 0.01%
Answer» D. 0.01%
Discussion
2453.

In the diode circuit of figure the diodes are ideal. The average current through ammeter is

A. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-223-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-223-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-223-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-223-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/317-223-4.png">
Discussion
2454.

In figure, transistor dc = 100 and LED voltage when it is conducting is 2 V. Then the base current which saturates the transistor is

A. 18 mA
B. 1.8 mA
C. 0.18 mA
D. 0.018 mA
Answer» D. 0.018 mA
Discussion
2455.

In figure the dc emitter current of each transistor is about

A. 4 mA
B. 2 mA
C. 3 mA
D. 1 mA
Answer» E.
Discussion
2456.

Feedback factor may be less or more than 1.

A. True
B. False
Answer» C.
Discussion
2457.

An RC oscillator uses

A. one RC combination
B. two RC combinations
C. at least three RC combinations
D. either (a) or (b)
Answer» D. either (a) or (b)
Discussion
2458.

Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum

A. when the phase difference between the inputs is 0
B. when the phase difference between the inputs in 90
C. when the phase difference between the inputs is 180
D. when the phase difference between the inputs is 0 or 180
Answer» D. when the phase difference between the inputs is 0 or 180
Discussion
2459.

The input voltage for starting oscillations in an oscillator is caused by

A. negative feedback
B. positive feedback
C. noise voltage in resistors
D. a special generator
Answer» D. a special generator
Discussion
2460.

The current flowing in a certain P-N junction at room temperature is 2 x 10-7 Amp. When a large reverse biased voltage is applied. Calculate the current flowing when 0.1 volts is applied.

A. 9 A
B. 10 A
C. 2 A
D. 4 A
Answer» B. 10 A
Discussion
2461.

In following figure find VDSQ by assuming gate current is negligible for the p-channel JFET. (if IDQ = - 6 mA, RS = 0, VDD = -18 V, RD = 2 k&amp;ohm;, IDSS = - 10 mA, IPO = - 3 V)

A. 4 V
B. - 6 V
C. - 10 V
D. 6 V
Answer» C. - 10 V
Discussion
2462.

In following figure find VGG by assuming gate current is negligible for the p-channel JFET. (if IDQ = - 6 mA, RS = 0, VDD = -18 V, RD = 2 k&amp;ohm;, IDSS = - 10 mA, IPO = - 3 V)

A. 0.67 V
B. 6.7 V
C. 7 V
D. 0.3 V
Answer» B. 6.7 V
Discussion
2463.

A difference amplifier using op-amp has closed loop gain = 50. If input is 2 V to each of inverting and non-inverting terminals, output is 5 mA. Then CMRR =

A. 20000
B. 2000
C. 200
D. 20
Answer» B. 2000
Discussion
2464.

The coupling capacitor in amplifier circuits

A. affects dc biasing
B. does not affect dc biasing
C. affects dc biasing to some extent
D. both (a) and (c)
Answer» C. affects dc biasing to some extent
Discussion
2465.

In figure if C is replaced by short circuit then RB will be

A. 425 K
B. 412 K
C. 474 K
D. 400 K
Answer» D. 400 K
Discussion
2466.

In a self bias circuit for CE amplifier, the emitter resistance is made three times the original value. The collector current will

A. remain the same
B. become three times
C. decrease
D. become one-third
Answer» E.
Discussion
2467.

A P-channel MOSFET operating in the enhancement mode is characterized by Vt = - 4 V and IDQ = - 10 mA, when VGSQ = - 5.5 V, what will be VGSQ if IDQ = -15 mA and ID, on = - 16 mA

A. - 2 V
B. 3 V
C. 0.13 V
D. 1.3 V
Answer» D. 1.3 V
Discussion
2468.

An ideal power supply has

A. zero internal resistance
B. very high internal resistance
C. high output resistance
D. both (b) and (c)
Answer» B. very high internal resistance
Discussion
2469.

A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is

A. 100 Hz
B. 50 Hz
C. 25 Hz
D. none of the above
Answer» B. 50 Hz
Discussion
2470.

The transistor of following figure in Si diode with a base current of 40 A and ICBO = 0, if VBB = 6V, RE = 2 k&amp;ohm; and = 90, IBQ = 20 A then IEQ =

A. 1800 A
B. 180 A
C. 2000 A
D. 3000 A
Answer» B. 180 A
Discussion
2471.

If the midband gain of an amplifier is 40 dB, the gain at half power frequency is

A. 37 dB
B. 30 dB
C. 20 dB
D. 13 dB
Answer» B. 30 dB
Discussion
2472.

An ideal op-amp requires

A. zero input offset voltage
B. low input offset voltage
C. high input offset voltage
D. infinite input offset voltage
Answer» B. low input offset voltage
Discussion
2473.

The JFET in the circuit shown in figure has an IDSS = 10 mA and Vp = -5V. The value of the resistance Rs for a drain current IDS = 6.4 mA is

A. 156 &ohm;
B. 470 &ohm;
C. 560 &ohm;
D. 1 k&ohm;
Answer» B. 470 &ohm;
Discussion
2474.

In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is

A. zero
B. 135
C. 180
D. 225
Answer» C. 180
Discussion
2475.

Which one of the following power amplifier has the maximum efficiency?

A. Class A
B. Class B
C. Class AB
D. Class C
Answer» E.
Discussion
2476.

Negative feedback lowers the cut off frequency and increase the upper cut off frequency of amplifier.

A. True
B. False
Answer» B. False
Discussion
2477.

In CB amplifier the distortion of the input voltage waveform may occur due to

A. very low input resistance of an amplifier
B. very high input resistance of the amplifier
C. improper biasing
D. ripples in power supply
Answer» B. very high input resistance of the amplifier
Discussion
2478.

As compared to full wave rectifier, a half wave rectifier

A. has higher ripple factor
B. has lower ripple factor
C. may have higher or lower ripple factor
D. has same ripple factor
Answer» B. has lower ripple factor
Discussion
2479.

Assertion (A): A self bias circuit is the most commonly used bias circuit for bipolar junction transistorsReason (R): A self bias circuit limits the increase in collector or emitter current due to change in junction temperature.

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
2480.

In an amplifier if conductor during the cycle is from 0 to 90 and again from 180 to 270 , the amplifier will be termed as

A. class A
B. class B
C. class C
D. class AB
Answer» C. class C
Discussion
2481.

A sine wave with slew rate distortion looks like

A. step wave
B. square wave
C. triangular wave
D. cosine wave
Answer» D. cosine wave
Discussion
2482.

Three cascaded stages have gains of 10, 20 and 25. The overall gain will be

A. 10
B. 55
C. 500
D. 5000
Answer» E.
Discussion
2483.

Find the odd one out

A. sweep voltage generator
B. multivibrators
C. sine wave oscillators
D. blocking oscillators
Answer» D. blocking oscillators
Discussion
2484.

The equivalent circuit shown in figure is for

A. CE
B. CB
C. CC
D. None of the above
Answer» D. None of the above
Discussion
2485.

In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 s wide, the duty cycle of current waveform is

A. 50%
B. 25%
C. 2.5%
D. 0.25%
Answer» D. 0.25%
Discussion
2486.

In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 k&amp;ohm;, current through RE is

A. 1 mA
B. 0.93 mA
C. 2 mA
D. 1.86 mA
Answer» C. 2 mA
Discussion
2487.

In a four variable K map eight adjacent cells give

A. single variable term
B. two variable term
C. three variable term
D. four variable term
Answer» B. two variable term
Discussion
2488.

A Charge Couple Device (CCD) is a

A. RAM
B. sequential accessed memory
C. content addressable memory
D. read only memory
Answer» C. content addressable memory
Discussion
2489.

The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is

A. 1 s
B. 2 s
C. 8 s
D. 16 s
Answer» D. 16 s
Discussion
2490.

Which device uses Pneumatic fluid?

A. LED
B. LCD
C. VF display
D. None of these
Answer» C. VF display
Discussion
2491.

A microcomputer has memory locations from 0000 to FFFF, each storing 1 byte. How many bytes can be the memory store?

A. 12333
B. 14666
C. 16384
D. 16655
Answer» D. 16655
Discussion
2492.

In a clocked NAND latch, race condition occur when

A. R and S are high CLK is low
B. R and CLK are high and S is low
C. R, S, CLK are high
D. R, S, CLK are low
Answer» D. R, S, CLK are low
Discussion
2493.

The microprograms provided by a manufacturer to be used on his microprogrammed computer are generally called

A. software
B. network
C. firmware
D. hardware
Answer» D. hardware
Discussion
2494.

The number of counter states which an 8 bit stair step A/D converter has to pass through before conversion takes place is equal to

A. 1
B. 8
C. 255
D. 256
Answer» E.
Discussion
2495.

The modulus of counter in the given figure is

A. 1
B. 2
C. 3
D. 4
Answer» D. 4
Discussion
2496.

Which of the following is not a characteristic of a flip flop?

A. It is a bistable device
B. It has two outputs
C. It has two outputs are complement of each other
D. It has one input terminal
Answer» E.
Discussion
2497.

A microprocessor with a 16 bit address bus is used in a linear memory selection configuration. Address bus lines are directly uses as chip selects of memory chips with 4 memory chips the maximum addressable memory space is

A. 64 k
B. 16 k
C. 8 k
D. 4 k
Answer» B. 16 k
Discussion
2498.

Assertion (A): A high density IC has more diodes, transistors and resistors per unit surface area.Reason (R): A high density IC can handle high voltages.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true
Answer» D. A is false, R is true
Discussion
2499.

Which of the following is not a specification of D/A and A/D converters?

A. Gain
B. Drift
C. Speed
D. Accuracy
Answer» B. Drift
Discussion
2500.

A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is

A. 83.33 sec
B. 1 sec
C. 0.1 m sec
D. 3.5 m sec
Answer» C. 0.1 m sec
Discussion