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MCQOPTIONS
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.
| 5301. |
In the slotted line measurement for standing wave Ratio (SWR), the distance between the two 3-dB points is d and ' the wavelength along the transmission line. SWR of the transmission system is given by |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-02-21-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-02-21-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-02-21-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-02-21-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-02-21-4.png"> | |
| 5302. |
Which of the following conditions must be satisfied for a transistor to remain under saturation? Its collector to base junction should be under forward bias.Its collector to base junction should be under reverse bias.Its emitter to base junction should be under reverse bias.Its emitter to base junction should be under forward bias. Select the correct answer from the codes given below: |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» E. | |
| 5303. |
Voltage 1 + 2 sin t is applied to the circuit shown below:The capacitor C and diode D can be considered ideal. RL is very large resistance. Then the magnitude of the average voltage across RL is __________ volt. |
| A. | 0 volt |
| B. | 2 volts |
| C. | -2 volts |
| D. | -3 volts |
| Answer» D. -3 volts | |
| 5304. |
The amplitude of a random signal uniformly distributed between - 5 V and 5 V. If the positive values of the signal are uniformly quantized with a step size of 0.05 V, and the negative values are uniformly quantized with a step size of 0.10 V, the resulting signal to quantization noise is approximately |
| A. | 46 dB |
| B. | 43.8 dB |
| C. | 42 dB |
| D. | 40 dB |
| Answer» E. | |
| 5305. |
Consider the following statements: With increase in temperature Fermi-level tries to come in between the energy gap exactly at middle Mobility of electron in GaAs is very high compared to mobility of holeIn LED, the light energy radiated due to recombination with the aid of traps. Which of these statements are true? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» B. 1, 2 and 3 | |
| 5306. |
The following series RLC circuit with zero initial conditions is excited by a unit impulse function (t)For t > 0, the voltage across the resistor is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-09-75-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-09-75-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-09-75-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-09-75-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-09-75-3.png"> | |
| 5307. |
In a CMOS CS amplifier, the active load is obtained by connecting a |
| A. | p channel current mirror circuit |
| B. | n channel transistor |
| C. | p channel transistor |
| D. | BJT current mirror |
| Answer» B. n channel transistor | |
| 5308. |
Consider a feedback control system with open loop transfer function The type of the closed loop system is __________ . |
| A. | zero |
| B. | one |
| C. | two |
| D. | three |
| Answer» C. two | |
| 5309. |
A ring counter with 5 flip-flops will have __________ states. |
| A. | 5 |
| B. | 10 |
| C. | 32 |
| D. | Infinite |
| Answer» B. 10 | |
| 5310. |
Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually 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» D. A is false but R is true | |
| 5311. |
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 | |
| 5312. |
An audio signal is band limited to 4 kHz. It is sampled at 8 kHz. What will be the spectrum of the sampled signal? |
| A. | -4 kHz to 4 kHz |
| B. | -8 kHz to 8 kHz |
| C. | every 4n kHz repeating |
| D. | every 8 kHz and operating as well as at zero (k integer) |
| Answer» D. every 8 kHz and operating as well as at zero (k integer) | |
| 5313. |
Consider the equation s2 + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot? |
| A. | -3.414 |
| B. | -2.414 |
| C. | -1.414 |
| D. | -0.414 |
| Answer» B. -2.414 | |
| 5314. |
The characteristic equation of a closed loop system is (s + 2) (s + 3) + K = 0. The centroid of the asymptotes in root locus is: |
| A. | 2.5 |
| B. | -2.5 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 5315. |
The number of roots of s3 + 2s2 + 7s + 3 = 0 in the left half of the s-plane is : |
| A. | zero |
| B. | one |
| C. | two |
| D. | three |
| Answer» E. | |
| 5316. |
When a particular mode is existed in a waveguide, there appears an extra electric component, in the direction of propagation. In what mode is the wave propagating? |
| A. | Transverse electric |
| B. | Transverse magnetic |
| C. | Transverse electromagnetic |
| D. | Longitudinal |
| Answer» C. Transverse electromagnetic | |
| 5317. |
Which of the following is NOT associated with a p-n junction? |
| A. | Junction capacitance |
| B. | Charge Storage Capacitance |
| C. | Depletion Capacitance |
| D. | Channel Length Modulation |
| Answer» E. | |
| 5318. |
Refer to the NAND and NOR latches shown in the figure. The inputs (P1, P2) for both the latches are first made (0, 1) and then, after a few seconds, made (1, 1). The corresponding stable outputs (Q1, Q2) are |
| A. | NAND: first (0, 1) then (0, 1) NOR: first (1, 0) then (0, 0) |
| B. | NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (1, 0) |
| C. | NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (0, 0) |
| D. | NAND: first (1, 0) then (1, 1) NOR: first (0, 1) then (0, 1) |
| Answer» D. NAND: first (1, 0) then (1, 1) NOR: first (0, 1) then (0, 1) | |
| 5319. |
Consider the following two statements about the internal conditions in an n-channel MOSFET operating in the active regionS1: The inversion charge decreases from source to drainS2: The channel potential increases from source to drainWhich of the following is correct? |
| A. | Only S2 is true |
| B. | Both S1 and S2 are false |
| C. | Both S1 and S2 are true, but S2 is not a reason for S1 |
| D. | Both S1 and S2 are true, and S2 is a reason for S1 |
| Answer» E. | |
| 5320. |
For what positive value of K does the polynomial s4 + 8s3 + 24s2 + 32s + K have roots with zero real parts? |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» E. | |
| 5321. |
Which of the following capabilities are available in a Universal Shift Register? Shift leftShift rightParallel loadSerial add Select the correct answer from the codes given below: |
| A. | 2 and 4 only |
| B. | 1, 2 and 3 |
| C. | 1, 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» C. 1, 2 and 4 | |
| 5322. |
For a second order instrument, the optimum range of (damping ratio), which gives good frequency response over a wide range of frequencies is |
| A. | 0.5 to 0.6 |
| B. | 0.6 to 0.7 |
| C. | 0.7 to 0.8 |
| D. | 0.8 to 1.0 |
| Answer» B. 0.6 to 0.7 | |
| 5323. |
If the connection of two-port is such that the transmission matrix of the overall network is the product of the transmission matrices of the individual networks, what type of connection is it? |
| A. | Series connection |
| B. | Cascade connection |
| C. | Parallel connection |
| D. | None of the above |
| Answer» C. Parallel connection | |
| 5324. |
A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder? |
| A. | 2 K |
| B. | 4 K |
| C. | 16 K |
| D. | 64 K |
| Answer» B. 4 K | |
| 5325. |
Thin gate oxide in a CMOS process in preferably grown using |
| A. | wet oxidation |
| B. | dry oxidation |
| C. | epitaxial deposition |
| D. | ion implantation |
| Answer» B. dry oxidation | |
| 5326. |
Time delay produced by an instruction code given below using 2 MHz clock is: MVI A, FFH LOOP: DCR A JNZ Loop |
| A. | 1783 s |
| B. | 1787 s |
| C. | 1781 s |
| D. | 1797 s |
| Answer» C. 1781 s | |
| 5327. |
Which of the following bridges is also used in an oscillator? |
| A. | Maxwell |
| B. | Schering |
| C. | Hay |
| D. | Wien |
| Answer» E. | |
| 5328. |
What is the purpose of a start in RS232 serial communication protocol? |
| A. | To synchronise receiver for receiving every byte |
| B. | To synchronise receiver for receiving a sequence of byte |
| C. | Acts as a parity bit |
| D. | To synchronise receiver for receiving the last byte |
| Answer» B. To synchronise receiver for receiving a sequence of byte | |
| 5329. |
Which of the following devices is a 'hot-electron' diode? |
| A. | Thermionic tube diode |
| B. | Schottky-Barrier diode |
| C. | Thomson-Deletion diode |
| D. | Thermal electron diode |
| Answer» C. Thomson-Deletion diode | |
| 5330. |
If D, G and denote the directly, power gain and efficiency of an antenna, then which of the following relation holds : |
| A. | DG = 1 |
| B. | = DG |
| C. | D = G |
| D. | D = G/ |
| Answer» E. | |
| 5331. |
Consider the following statements: Internal sorting is used if the number of items to be sorted is very large.External sorting is used if the number of items to be sorted is vary large.External sorting needs auxiliary storage.Internal sorting needs auxiliary storage. Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 2 and 4 |
| Answer» C. 3 and 4 | |
| 5332. |
The electric field of uniform plane wave is given by E = 20 sin (2 p x 108t- pz) x + 20 cos (2 p x 108t - pz) y. The wave propagates in direction of |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-06-77-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-06-77-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-06-77-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-06-77-4.png"> |
| Answer» E. | |
| 5333. |
The characteristic polynomial of a system is q(s) = 2s5 + s4 + 4s3 + 2s2 + 1. The system is : |
| A. | stable |
| B. | marginally stable |
| C. | unstable |
| D. | oscillatory |
| Answer» D. oscillatory | |
| 5334. |
For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s + 15 The number of roots which lie in the right half of the s plane is : |
| A. | 4 |
| B. | 2 |
| C. | 3 |
| D. | 1 |
| Answer» C. 3 | |
| 5335. |
Which of the following describe the correct properties of an emitter follower circuit? It is a voltage series feedback circuit.It is a current series feedback circuit.Its voltage gain in less than unity.Its output impedance is very low. Select the correct answer from the codes given below: |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | 2 and 3 only |
| D. | 2 and 4 only |
| Answer» B. 2, 3 and 4 | |
| 5336. |
The energy stored in a magnetic field is given by |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/4-785-4-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/4-785-4-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/4-785-4-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/4-785-4-4.png"> |
| Answer» E. | |
| 5337. |
Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually 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» D. A is false but R is true | |
| 5338. |
The Nyquist plot of a stable, transfer function G(s) is shown in the figure. We are interested in the stability of the closed loop system in the feedback configuration shown.The gain and phase margins of G(s) for closed loop stability are |
| A. | 6 dB and 180 |
| B. | 3 dB and 180 |
| C. | 6 dB and 90 |
| D. | 3 dB and 90 |
| Answer» D. 3 dB and 90 | |
| 5339. |
Faraday's induction law states that a changing magnetic field is accompanied by an electric field. Which of the following equation represents it? |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-01-4-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-01-4-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-01-4-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-01-4-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/12-01-4-4.png"> | |
| 5340. |
What is the period of the sinusoidal signal x(n) = 5 cos [0.2 pn]? |
| A. | 10 |
| B. | 5 |
| C. | 1 |
| D. | 0 |
| Answer» B. 5 | |
| 5341. |
The resolution of a DAC depends on which of the following? |
| A. | The number of bits |
| B. | Monotonicity |
| C. | Reference voltage |
| D. | The values of resistance |
| Answer» B. Monotonicity | |
| 5342. |
When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling |
| A. | 1/2 |
| B. | 1/4 |
| C. | 1/8 |
| D. | none of these |
| Answer» C. 1/8 | |
| 5343. |
In the following astable multivibrator circuit, which properties of v0(t) depends on R2? |
| A. | Only the frequency |
| B. | Only the amplitude |
| C. | Both the amplitude |
| D. | Neither the amplitude nor the frequency |
| Answer» B. Only the amplitude | |
| 5344. |
If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t = 0. then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-02-28-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-02-28-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-02-28-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-02-28-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/3-02-28-2.png"> | |
| 5345. |
Following state diagram shows clocked sequential circuit: How many states the sequential circuit has? |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 4 |
| Answer» D. 4 | |
| 5346. |
Which of the following oscillators is used for the generation of high frequencies? |
| A. | R-C phase shift oscillator |
| B. | Wien bridge oscillator |
| C. | L-C oscillator |
| D. | Blocking oscillator |
| Answer» D. Blocking oscillator | |
| 5347. |
Which of the following meters cannot measure a.c. quantities? |
| A. | Thermocouple |
| B. | Hot wire |
| C. | P.M.M.C. |
| D. | Electrodynamometer. |
| Answer» D. Electrodynamometer. | |
| 5348. |
For the circuit shown in the figure, D has a transition from 0 to 1 after CLK changes from 1 to 0. Assume gate delays to be negligibleWhich of the following statements is true? |
| A. | Q goes to 1 to the CLK transition and stays at 1 |
| B. | Q goes to 0 at the CLK transition and stays at 10 |
| C. | Q goes to 1 at the CLK transition and goes to 0 when D goes to 1 |
| D. | Q goes to 0 at the CLK transition and goes to 1 when D goes to 1 |
| Answer» D. Q goes to 0 at the CLK transition and goes to 1 when D goes to 1 | |
| 5349. |
What is the major cause of creeping in an energy-meter? |
| A. | Over compensation for friction |
| B. | Mechanical vibrations |
| C. | Excessive voltage across the potential coil |
| D. | Stray magnetic fields |
| Answer» B. Mechanical vibrations | |
| 5350. |
An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8where K is the forward gain of the system. The condition for closed loop stability is |
| A. | K = 0.528 |
| B. | K = 2 |
| C. | K = 0 |
| D. | K = -2528 |
| Answer» B. K = 2 | |