MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
The minimal function that can detect a "divisible by 3" 8421 BCD code digit (representation D8D4D2D1) is given by |
| A. | D8D1 + D4D2 + D8D2D1 |
| B. | D8D1 + D4D2 D1 + D4D2D1 + D8D4D2D1 |
| C. | D4D1 + D4D2 + D8D4 D2D1 |
| D. | D4D2D1 + D4D2D1 + D8D4D2D1 |
| Answer» C. D4D1 + D4D2 + D8D4 D2D1 | |
| 552. |
e-2t is __________ . |
| A. | energy signal |
| B. | power signal |
| C. | neither energy signal nor power signal |
| D. | both energy and power signal |
| Answer» D. both energy and power signal | |
| 553. |
The effective length of an 1/2 antenna (Given Rr = 73 Ω and (Ae)max = 0.34λ2 and η = 120p) is __________ . |
| A. | 0.6348 λ |
| B. | 0.5133 λ |
| C. | 0.1587 λ |
| D. | 0.3714 λ |
| Answer» C. 0.1587 Œª | |
| 554. |
Mid-band gain = |
| A. | 100 |
| B. | -100 |
| C. | 50 |
| D. | -50 |
| Answer» C. 50 | |
| 555. |
Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies? |
| A. | h-parameter model |
| B. | y-parameter model |
| C. | s-parameter model |
| D. | hybrid-p model |
| Answer» E. | |
| 556. |
Find I in 4 Ω resistor. |
| A. | 0.041666666666667 |
| B. | 0.5 A |
| C. | 0.75 A |
| D. | 0.95 A |
| Answer» D. 0.95 A | |
| 557. |
A generator of 50 Ω internal impedance and operating at 1 GHz feeds a 75 Ω load via a coaxial line of characteristic impedance 50 Ω. The VSWR on the feed line is |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 1.75 |
| Answer» C. 2.5 | |
| 558. |
Narrow band FM signal can be represented as |
| A. | A cos (2pfct) - βA sin (2pfct) sin (2pfmt) |
| B. | A cos (2pfmt) - βA sin (2pfct) sin (2pfmt) |
| C. | A cos (2pfct) + βA sin (2pfct) sin (2pfmt) |
| D. | A cos (2pfmt) + βA sin (2pfmt) sin (2pfct) |
| Answer» B. A cos (2pfmt) - Œ≤A sin (2pfct) sin (2pfmt) | |
| 559. |
The Wheatstone bridge method of measuring resistance is ideally suited for the measurement of resistance values in the range of |
| A. | 0.001 to 1 Ω |
| B. | 0.1 to 100 Ω |
| C. | 100 Ω to 10 kΩ |
| D. | 100 kΩ to 10 MΩ |
| Answer» D. 100 kŒ© to 10 MŒ© | |
| 560. |
The magnitude plot of a composite signal x(t) = e2jt + e3jt is |
| A. | Half wave rectified sinusoid |
| B. | Full wave rectified sinusoid |
| C. | Exponentially increasing sinusoid |
| D. | Exponentially decreasing sinusoid |
| Answer» C. Exponentially increasing sinusoid | |
| 561. |
For the network shown below, determine fHi and fHO, if, r0 = ‚àû, Cbe = 36 Pf, Cbc = 4 Pf, Cce = 1 Pf, Cwo = 8 Pf, Cwi = 6 Pf where Cwo = wiring capacitance at output side, Cwi = wiring capacitance at input side |
| A. | 738.24 KHz, 8.6 MHz |
| B. | 781.2 KHz, 10.6 MHz |
| C. | 838.32 KHz, 9.2 MHz |
| D. | 938.24 KHz, 8.2 MHz |
| Answer» B. 781.2 KHz, 10.6 MHz | |
| 562. |
Consider the z-transform X(z) = 5z2 + 4z-1 + 3; 0 < |z| < ‚àû The inverse transform x[n] is |
| A. | 5δ[n + 2] + 3δ[n] + 4δ[n - 1] |
| B. | 5δ[n - 2] + 3δ[n] + 4δ[n + 1] |
| C. | 5u[n + 2] + 3u[n] + 4u[n - 1] |
| D. | 5u[n - 2] + 3u[n] + 4u[n + 1] |
| Answer» B. 5Œ¥[n - 2] + 3Œ¥[n] + 4Œ¥[n + 1] | |
| 563. |
What is the address space of 8086 CPU? |
| A. | One Megabyte |
| B. | 256 Kilobytes |
| C. | 1 K Megabytes |
| D. | 64 Kilobytes |
| Answer» B. 256 Kilobytes | |
| 564. |
Which of the following is neither power nor energy signal? |
| A. | sin 2t + cos 3t |
| B. | |
| C. | ramp |
| Answer» D. | |
| 565. |
In the circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op-amp |
| A. | Positive feedback, V = 10 V |
| B. | Positive feedback, V = 0 V |
| C. | Negative feedback, V = 5 V |
| D. | Negative feedback, V = 2 V |
| Answer» E. | |
| 566. |
The fourier transform of a voltage signal x(t) is X(f). The unit of X(f) is __________ . |
| A. | volts |
| B. | volt2 |
| C. | volt/sec |
| D. | volt-sec |
| Answer» E. | |
| 567. |
The function shown in figure, can represent a probability density function for A __________ |
| A. | A = 1/4 |
| B. | A = 1/6 |
| C. | A = 1/9 |
| D. | A = 1/2 |
| Answer» D. A = 1/2 | |
| 568. |
The trigonometric Fourier series for the waveform f(t) shown below contain |
| A. | only cosine terms and zero value for the dc component |
| B. | only cosine terms and a positive value for the dc component |
| C. | only cosine terms and a negative value for the dc component |
| D. | only sine terms and a negative for the dc component |
| Answer» D. only sine terms and a negative for the dc component | |
| 569. |
Time delay produced by an instruction code given below using 2 MHz clock is: MVI A, FFH LOOP: DCR A JNZ Loop |
| A. | 1783 μs |
| B. | 1787 μs |
| C. | 1781 μs |
| D. | 1797 μs |
| Answer» C. 1781 Œºs | |
| 570. |
Which of the following periodic waveforms will have only odd harmonics of sinusoidal waveform?Select the correct option using the codes given below Codes: |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 1 and 4 |
| D. | 2 and 4 |
| Answer» B. 1 and 3 | |
| 571. |
Consider a silicon p-n junction at room temperature having the following parameters:Doping on the n-side = 1 x 1017 cm-3Depletion width on the n-side = 0.1 μmDepletion width on the p-side = 1.0 μmIntrinsic carrier concentration = 1.4 x 1014F. cm-1.Thermal voltage = 26mVPermittivity of free space = 8.85 x 10-14F. cm-1.Dielectric constant of silicon = 12. A built in potential of the junction. |
| A. | is 0.70V |
| B. | is 0.76V |
| C. | is 0.82V |
| D. | cannot be estimated from the data given |
| Answer» C. is 0.82V | |
| 572. |
Following information is given: x(z) has two poles at z = and z = - 1x(1) = 1, x(- 1) = 1ROC includes Then x(n) is: |
| A. | u(n) + (-1)n u(- n - 1) |
| B. | 2 u(n) + (-1)n u(- n - 1) |
| C. | 2 u(n - 1) + (-1)n - 1 u(- n) |
| D. | None |
| Answer» C. 2 u(n - 1) + (-1)n - 1 u(- n) | |
| 573. |
If there is phase error in the carrier signal for the detection of SSB signals, then |
| A. | the output gets reduced, but a phase distortion results |
| B. | the output is not reduced, but a phase distortion results |
| C. | the output is not reduced, and also no distortion |
| D. | the output is reduced, no phase distortion |
| Answer» E. | |
| 574. |
Consider the following statements:The klystron and travelling wave tube differ from each other, In TWT the microwave circuit is non- resonant.In klystron the microwave circuit is resonant.TWT uses attenuator.The wave is TWT is a non-propagating wave. Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 3 and 4 only |
| C. | 1, 2 and 3 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 575. |
Which of the following output configurations are available in a TTL gate? Open collector outputTotem pole outputTristate output Select the correct answer from the codes given below: |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 576. |
Find the maximum power that can be delivered to a load |
| A. | 0.025 W |
| B. | 2.5 W |
| C. | 2.5 W |
| D. | 0.25 W |
| Answer» E. | |
| 577. |
With respect to transmission parameters, which one of the following is correct? |
| A. | A and B are dimensionless |
| B. | B and C are dimensionless |
| C. | A and D are dimensionless |
| D. | B and D are dimensionless |
| Answer» D. B and D are dimensionless | |
| 578. |
Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave. |
| A. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| B. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
| C. | (A) is true but (R) is false |
| D. | (A) is false but (R) is true |
| Answer» C. (A) is true but (R) is false | |
| 579. |
For a random variable x following the probability density function, p(x), shown in figure, the mean and the variance are respectively, |
| A. | 1/2 and 2/3 |
| B. | 1 and 4/3 |
| C. | 1 and 2/3 |
| D. | 2 and 4/3 |
| Answer» C. 1 and 2/3 | |
| 580. |
Find equivalent capacitance if each capacitance is 2 F. |
| A. | 5/12 F |
| B. | 12/5 F |
| C. | 6/5 F |
| D. | 5/6 F |
| Answer» C. 6/5 F | |
| 581. |
The following sequence represents autocorrelation of a real valued signal. The energy of real valued sequence is given by __________ x(n) = {1, _, 3, _, 5, _, 7, _, 9, 10, _, 8, _, 6, _, 4, _, 2, _}‚Üë |
| A. | 2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92] + 102 |
| B. | 10 |
| C. | 102 |
| D. | 2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92 + 102] |
| Answer» C. 102 | |
| 582. |
Consider the following: SiGeGaAsInP Which of the above semiconductors should be used for making highly efficient photodiodes? |
| A. | 1 and 4 only |
| B. | 3 and 4 only |
| C. | 1, 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» C. 1, 3 and 4 | |
| 583. |
Which of the following photodetector does not provide gain? |
| A. | Phototransistor |
| B. | Photoconductor |
| C. | Avalanche photodiode |
| D. | p-i-n photodiode |
| Answer» E. | |
| 584. |
The circuit I in figure is |
| A. | 1 mA |
| B. | 4 mA |
| C. | 8 mA |
| D. | 10 mA |
| Answer» E. | |
| 585. |
Consider the following statements about a good power supply: The a.c. ripple should be highSv, (Voltage stability factor) should be lowST, (Temperature stability factor) should be low Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 2 only |
| C. | 3 only |
| D. | 2 and 3 only |
| Answer» E. | |
| 586. |
Find Y in the circuit below :f1(E, F) = ‚àë(0, 1, 2, 3)f2(A, B, E, F) = ‚àë(0, 1, 2, 3, 5, 6, 9)f3(A, B, E, F) = ‚àè(4, 7, 8, 10, 11, 12, 13, 14, 15) |
| A. | f2 |
| B. | f2 |
| C. | 0 |
| D. | ‚àë(0, 1, 2, 3, 5, 6, 9) |
| Answer» D. ‚àë(0, 1, 2, 3, 5, 6, 9) | |
| 587. |
The impulse response h(t) of a linear invariant continuous time system is given by h(t) = exp (- 2t) u(t), where u(t) denotes the unit step function. The output of this system to the sinusoidal input x(t) = 2cos(2t) for all time t, is |
| A. | 0 |
| B. | 2-0.25 cos (2t - 0.125p) |
| C. | 2-0.5 cos (2t - 0.125p) |
| D. | 2-0.5 cos (2t - 0.25p) |
| Answer» E. | |
| 588. |
Values of iL, , VC and at t = 0 are given by, |
| A. | 4 Amp, - 4 Amp/sec, 12 volts, - 4 volts/s |
| B. | 4 Amp, 4 Amp/sec, -12 volts, - 12 volts/s |
| C. | 6 Amp, - 2 Amp/sec, 0 volts, - 2 volts/sec |
| D. | 6 Amp, 0 Amp/sec, - 2 volts, - 2 volts/sec |
| Answer» D. 6 Amp, 0 Amp/sec, - 2 volts, - 2 volts/sec | |
| 589. |
For a series R-L-C circuit, the characteristic equation is given as If is denoted by a and by β, then under the condition of β2 > a2, the system will be |
| A. | critically damped |
| B. | underdamped |
| C. | undamped |
| D. | overdamped |
| Answer» C. undamped | |
| 590. |
A control system is as shown in given figure The maximum value of gain K for which the system is stable is |
| A. | more than 5 |
| B. | equal to 5 |
| C. | less than 1 |
| D. | less than 5 |
| Answer» E. | |
| 591. |
Using 4-bit numbers (n = 4) if k = 00112, how is k expressed in 2's complement? |
| A. | 10112 |
| B. | 11012 |
| C. | 11002 |
| D. | 1012 |
| Answer» C. 11002 | |
| 592. |
What is the chemical bonding in silicon semiconductor? |
| A. | Metallic |
| B. | Ionic |
| C. | Covalent |
| D. | van der Waals |
| Answer» D. van der Waals | |
| 593. |
In the circuit, shown in figure, V0 = Vi. The values of 1, m, n are: (x represents don't care conditions) |
| A. | 0, 1, 1 |
| B. | ‚àû, x, x |
| C. | x, ‚àû, x |
| D. | 0, x, ‚àû |
| Answer» C. x, ‚àû, x | |
| 594. |
Which of the following addressing modes is used in the instruction PUSH B? |
| A. | Direct |
| B. | Register |
| C. | Register Indirect |
| D. | Immediate |
| Answer» D. Immediate | |
| 595. |
Consider the following diagrams showing vector fields :The correct statements are |
| A. | For figure (a), ‚àá . = 0, ‚àá x = 0 |
| B. | For figure (a), ∇ . = 0, ∇ x ≠ 0 |
| C. | For figure (b), ∇ . = 0, ∇ x ≠ 0 |
| D. | For figure (c), ∇ . = 0, ∇ x ≠ 0 |
| Answer» C. For figure (b), ‚àá . = 0, ‚àá x ‚↠0 | |
| 596. |
The Laplace transform of the given waveform is |
| A. | (1 - e-s + e-2s) |
| B. | (1 - e-s + e-2s) |
| C. | (1 - 2e-s + e-2s) |
| D. | (1 - 2e-s) |
| Answer» D. (1 - 2e-s) | |
| 597. |
In Quine-Mclusky method of Boolean function reduction; __________ , are treated as __________ and therefore discrepancies may occur in the final solution, therefore this method is not applicable to the functions with __________ . |
| A. | zeros, don't care conditions, zeros |
| B. | one's, don't care conditions, one's |
| C. | don't care conditions, zeros, don't care conditions |
| D. | don't care conditions, don't care conditions, don't care conditions |
| Answer» D. don't care conditions, don't care conditions, don't care conditions | |
| 598. |
A first order system will never be able to give a __________ response. Band passBand rejectAll pass Choose the correct option |
| A. | 1, 2 and 3 are true |
| B. | 1 and 3 are true, 2 is false |
| C. | 1 and 2 are false, 3 is true |
| D. | 1 and 2 are true, 3 is false |
| Answer» E. | |
| 599. |
A lossless transmission line is 50 cm long and operates at a frequency of 500 MHz. Inductance and capacitances present in a line are 0.5 μH/m and 200 pF/m. Phase constant and phase velocity are respectively. |
| A. | 5p, 2p x 108 m/sec |
| B. | 5p, 108 m/sec |
| C. | 31.4, 108 m/sec |
| D. | 31.4, 2p x 108 m/sec |
| Answer» C. 31.4, 108 m/sec | |
| 600. |
The output of a Mealy system is 1 if there has been a pattern of 11000, otherwise 0. The minimum state for this system is : |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |