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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.
| 5201. |
The stage marked X in the architecture shown below of a two stage op-amp is : |
| A. | Direct coupled amplifier |
| B. | Buffer amplifier |
| C. | Level shifter |
| D. | Blocking oscillator |
| Answer» D. Blocking oscillator | |
| 5202. |
Multiple member of antennas are arranged in arrays in order to enhance what property? |
| A. | Both directivity and bandwidth |
| B. | Only directivity |
| C. | Only bandwidth |
| D. | Neither directivity nor bandwidth |
| Answer» C. Only bandwidth | |
| 5203. |
Signal flow graph is used to find : |
| A. | stability of the system |
| B. | controllability of the system |
| C. | transfer function of the system |
| D. | poles of the system |
| Answer» E. | |
| 5204. |
Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material? |
| A. | Diaphragm |
| B. | Capacitor |
| C. | L.V.D.T. |
| D. | Piezoelectric crystal. |
| Answer» C. L.V.D.T. | |
| 5205. |
Diffusion current of holes in a semiconductor is proportional to (with p = concentration of holes/unit volume) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-02-23-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-02-23-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-02-23-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-02-23-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-02-23-3.png"> | |
| 5206. |
Which of the following flip-flop is used as a latch? |
| A. | J K flip-flop |
| B. | R S flip-flop |
| C. | T flip-flop |
| D. | D flip-flop |
| Answer» E. | |
| 5207. |
In closed loop control system, what is the sensitivity of the gain of the overall system, M to the variation in G? |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-59-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-59-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-59-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-59-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-59-2.png"> | |
| 5208. |
Ferromagnetic materials show hysteresis in B - H characteristic. As the magnetic field in increased slowly from zero value, what is the first process which sets the material to give net magnetization? |
| A. | Growth of favourably oriented domains at the cost of other domains by reversible boundary displacements |
| B. | Growth of favourably oriented domains at the cost of other domains by irreversible boundary displacements |
| C. | Domain wall orientation |
| D. | A combination of processes (a) and (c) above |
| Answer» E. | |
| 5209. |
What are the minimum number of 2 to 1 multiplexers required to generate a 2 input AND gate a 2 input Ex-OR gate? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 1 and 1 |
| D. | 2 and 2 |
| Answer» B. 1 and 3 | |
| 5210. |
Which of the following is a microwave source with a 'cross-field' structure? |
| A. | Double cavity klystron |
| B. | Reflex klystron |
| C. | Magnetron |
| D. | Travelling wave tube |
| Answer» D. Travelling wave tube | |
| 5211. |
Transfer function of a certain system is: The approximate 2% settling time for unit step input is |
| A. | 2 sec |
| B. | 4 sec |
| C. | 6 sec |
| D. | 8 sec |
| Answer» C. 6 sec | |
| 5212. |
With which decoder it is possible to obtain many code conversions? |
| A. | 2 line to 4 line |
| B. | 3 line to 8 line |
| C. | not possible with any decoder |
| D. | 4 line to 16 line decoder |
| Answer» E. | |
| 5213. |
On which bands, do the optical fibers operate? Ultra violet bandUltra high frequency bandVisible light bandInfrared band Select the correct answer from the codes given below: |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 1, 2 and only |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 5214. |
Consider a system whose input x and output y are related by the equationy(t) = x(t - t)h(2t)dtwhere h(t) is shown in the graphwhich of the following four properties are possessed by the system?BIBO: Bounded input gives a bounded outputCausal: The system is causalLP: The system is low passLTI: The system is linear and time invariant |
| A. | Causal, LP |
| B. | BIBO, LTI |
| C. | BIBO, Causal, LTI |
| D. | LP, LTI |
| Answer» C. BIBO, Causal, LTI | |
| 5215. |
The following components are used to measure power output of a 2 kW TWT amplifier: TWTALow pass/high pass filter20 dB attenuator40 dB directional complex with matched loadPower load What is the correct sequence of connection of these components? |
| A. | 2 - 4 - 1 - 3 - 5 |
| B. | 1 - 3 - 4 - 2 - 5 |
| C. | 1 - 2 - 4 - 3 - 5 |
| D. | 2 - 4 - 1 - 5 - 3 |
| Answer» C. 1 - 2 - 4 - 3 - 5 | |
| 5216. |
Consider the following statements regarding sources or error in a Q-meter: If a coil with resistance R is connected in direct measurement mode and if the residual resistance of Q-meter is 0.1 R, then the measure Q of the coil would be 1.1 times the actual Q.If the inductance to be measured is less than 0.1 mH, the error due to presence of residual inductance cannot be neglected.The presence of distributed capacitance in a coil modifies the effective Q of the coil. Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 5217. |
Consider an AM system using a square law detector as shown in figure.XC(t) = AC[1 + u x (t)] cos ct, |ux(t)| << 1 if the channel noise is AWGN with PSD of |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/11-03-43-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/11-03-43-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/11-03-43-4.png"> |
| D. | None |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/11-03-43-3.png"> | |
| 5218. |
In the given circuit, the switch is open for a long time. At time t = 0, the switch is closed. What are the initial and final values of voltages across the inductor? |
| A. | 0 V and 0 V |
| B. | 0 V and 80 V |
| C. | 80 V and 0 V |
| D. | 80 V and 80 V |
| Answer» D. 80 V and 80 V | |
| 5219. |
Consider the following statements:In the case of space wave propagation, the signal strength at the receiver is Directly proportional to transmitter and receiver heights.Inversely proportional to distance between transmitter and receiver.Directly proportional to frequency. Which of the above statements is/are correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» C. 2 and 3 | |
| 5220. |
An 8085 microprocessor is operating at 2 MHz frequency and executes the following program :START : MOV A, BOUT 55HDCR BSTA 2700HNOPNOPJMP STARTIdentify the total number of machine cycles required to execute the above program till the JMP instruction is executed for the first time. |
| A. | 12 |
| B. | 13 |
| C. | 14 |
| D. | 15 |
| Answer» D. 15 | |
| 5221. |
An 8085 executes the following instructions2710 LXI H, 30A0H2713 DAD H2714 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct? |
| A. | PC = 2715 H HL = 30A0 H |
| B. | PC = 30A0H HL = 2715H |
| C. | PC = 6104 H HL = 6140 H |
| D. | PC = 6140H HL = 2715H |
| Answer» D. PC = 6140H HL = 2715H | |
| 5222. |
What is an advantage of an electronic voltmeter over a non-electronic voltmeter? |
| A. | Low power consumption |
| B. | Low input impedance |
| C. | The ability to measure wide ranges of voltages and resistance |
| D. | Large portability |
| Answer» B. Low input impedance | |
| 5223. |
Which of the following statements is/are true for the diamond structure? Coordination number is four.Packing fraction is 0.34Copper crystallizes into diamond structureLattice is FCC. |
| A. | 1 only |
| B. | 1, 2 and 4 |
| C. | 2 and 3 only |
| D. | 2, 3 and 4 |
| Answer» C. 2 and 3 only | |
| 5224. |
Assertion (A): There are no convergence issues with the discrete-time Fourier series in general.Reason (R): A discrete-time signal is always obtained by sampling a continuous-time signal. |
| 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» E. | |
| 5225. |
Which of the following are the memory performance parameters? Access time and latencyBlock size and Block access timeCycle time and Bandwidth 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. | |
| 5226. |
Which of the following conditions should be satisfied to call an astable multivibrator circuit using discrete components as a digital circuit? A flip-flop is always a digital circuit. Only when we assign 1 and 0 to the high and low levels of the output, a flip-flop is called a digital circuit. Only if the power, supply voltage is maintained at + 5 V or - 5 V, it is called a digital circuit. Only if it is in IC form, following the technology of IC manufacture, it is called a digital circuit.Select the correct answer from the codes given below: |
| A. | 1 only |
| B. | 2 and 3 |
| C. | 2 only |
| D. | 3 and 4 |
| Answer» B. 2 and 3 | |
| 5227. |
Assertion (A): Capacitance of a solid conducting spherical body of radius 'a' is given by 4 p 0a in free space.Reason (R): x H = j E + J. |
| 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» C. A is true but R is false | |
| 5228. |
The PCM signal shown below uses amplitude level of +1 volt and -1 volt to represent binary symbol 0 and 1 respectively. Each code word consists of 4 bits. The sampled version of analog signal from which this PCM signal is derived is |
| A. | EB596 |
| B. | CD231 |
| C. | DA495 |
| D. | 25B6A |
| Answer» E. | |
| 5229. |
Consider a situation where number of minterms with even number of 0's are same as number of minterms with odd number of 1's. Then minterms with even number of 0's and minterms with odd number of 1's are __________ to each other then number of variables is __________ . |
| A. | equivalent, even |
| B. | complement, odd |
| C. | complement, even |
| D. | none of these |
| Answer» D. none of these | |
| 5230. |
Consider a multiplexer with X and Y as data inputs and Z as control input. Z = 0 selects input X and Z = 1 selects input Y. What are the connections required to realize the 2-variable Boolean function f = T + R, without using any additional hardware? |
| A. | R to X, 1 to Y, T to Z |
| B. | T to X, R to Y, T to Z |
| C. | T to X, R to Y, 0 to Z |
| D. | R to X, 0 to Y, T to Z |
| Answer» B. T to X, R to Y, T to Z | |
| 5231. |
Which junction has least junction capacitance? |
| A. | Alloy |
| B. | Grown |
| C. | Diffused |
| D. | Point contact |
| Answer» E. | |
| 5232. |
A system is described by following equations of state variables analysis. , C = [1 1] The steady state error due to step input is: |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-56-3.94-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-744-15-1.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-42-2.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-42-3.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-42-3.png"> | |
| 5233. |
Number of fundamental cut-sets of any graph will be |
| A. | same as the number of twigs |
| B. | same as the number of tree branches |
| C. | same as the number of nodes |
| D. | equal to one |
| Answer» B. same as the number of tree branches | |
| 5234. |
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 mDepletion width on the p-side = 1.0 mIntrinsic 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 | |
| 5235. |
Consider the common emitter amplifier shown below with the following circuit parameters: = 100, gm = 0.3861 A/V, r0 = rp = 259 , Rs = 1 k , RB = 93 k , RC = 250 , RL = 1 kW, C1 = and C2 = 4.7mF.The lower cut-off frequency due to C2 is |
| A. | 33.9 Hz |
| B. | 27.1 Hz |
| C. | 13.6 Hz |
| D. | 16.9 Hz |
| Answer» B. 27.1 Hz | |
| 5236. |
Which of the following can be used as a tachogenerator in control systems? |
| A. | Microsyn |
| B. | DC servomotor |
| C. | AC servomotor |
| D. | Magnetic amplifier |
| Answer» D. Magnetic amplifier | |
| 5237. |
Six sets of electromagnetic waves are given below :30 - 300 KHz10 - 30 KHz3 - 30 MHz300 - 3000 KHz30 - 300 MHz> 300 MHzThere are designated in the following order |
| A. | VLF, LF, MF, HF, VHF, UHF |
| B. | LF, VLF, MF, HF, VHF, VHF |
| C. | LF, VLF, HF, MF, VHF, UHF |
| D. | VHF, VLF, HF, MF, LF, UHF |
| Answer» D. VHF, VLF, HF, MF, LF, UHF | |
| 5238. |
Given A = the state transition matrix eAT is given by |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-02-20-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-02-20-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-02-20-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-02-20-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-02-20-3.png"> | |
| 5239. |
Which among the following waveforms can be reconstructed from its samples without distortion? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | Only 2 |
| Answer» B. 2 and 3 | |
| 5240. |
A standard waveguide W R90 has inside wall dimensions of a = 2.286 cm and b = 1.016 cm. What is the cut-off wavelength for TE01 mode? |
| A. | 4.572 cm |
| B. | 2.286 cm |
| C. | 2.032 cm |
| D. | 1.857 cm |
| Answer» D. 1.857 cm | |
| 5241. |
Which of the following statements is not correct for thermistors? |
| A. | They have negative temperature coefficient of resistance |
| B. | The sensing element is made of sintered ceramics, which are oxides of metals in the form of beads |
| C. | The variation of resistance with temperature is linear |
| D. | The resistance value at ambient temperature may range from 100 to 100 k |
| Answer» D. The resistance value at ambient temperature may range from 100 to 100 k | |
| 5242. |
Which one of the following logic families can be operated using a supply voltage from 3 V to 15 V? |
| A. | TTL |
| B. | ECL |
| C. | PMOS |
| D. | CMOS |
| Answer» E. | |
| 5243. |
Two products are sold from a vending machine, which has two push buttons P1 and P2. When a button is pressed, the price of the corresponding product is displayed in a 7-segment display. If no buttons are pressed, '0' is displayed, signifying 'Rs' .0'. If only P1 is pressed, '2' is displayed, signifying 'Rs. 2'.If only P2 is pressed, '5' is displayed, signifying 'Rs. 5'.If both P1 and P2 are pressed, 'E' is displayed, signifying 'Error'. The names of the segments in the 7-segment display, and the glow of the display for '0', '2', '5' and 'E', are shown below.Consider push button pressed/not pressed is equivalent to logic 1/ 0 respectivelya segment a to g are considered as functions of P1 and P2, then which of the respectively. What are the minimum number of NOT gates and 2-input OR gates required to design the logic of the driver for this 7-segment display? |
| A. | 3 NOT and 4 OR |
| B. | 2 NOT and 4 OR |
| C. | 1 NOT and 3 OR |
| D. | 2 NOT and 3 OR |
| Answer» E. | |
| 5244. |
Gain of the circuit shown below is: |
| A. | 3 |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-03-27-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-03-27-3.png"> |
| D. | -1 |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-03-27-2.png"> | |
| 5245. |
A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage? |
| A. | 1.0 V |
| B. | 1.5 V |
| C. | 2.0 V |
| D. | 2.5 V |
| Answer» E. | |
| 5246. |
What can be the maximum dimension of an array in C language program? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | It is compiler dependent |
| Answer» E. | |
| 5247. |
The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T = 300 K, electronic charge = 1.6 x 10-19C, thermal voltage = 26mV and electron mobility = 1350 cm2/V-sThe magnitude of the electric field at x = 0.5 m is |
| A. | 1 kV/cm |
| B. | 5 kV/cm |
| C. | 10 kV/cm |
| D. | 26 kV/cm |
| Answer» D. 26 kV/cm | |
| 5248. |
Which of the following devices has the 'negative resistance' characteristic? |
| A. | Reflex klystron |
| B. | Gunn diode |
| C. | P-N-P transistor |
| D. | Magnetron |
| Answer» C. P-N-P transistor | |
| 5249. |
Assertion (A): When all inputs of a NAND-gate are shorted to get a one input, one output gate, it becomes an inverter.Reason (R): When all inputs of a NAND-gate are at logic 'O' level, the output is at logic 'I' level. |
| 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» C. A is true but R is false | |
| 5250. |
Which of the following may result in instability problem? |
| A. | Large error |
| B. | High selectivity |
| C. | High gain |
| D. | Noise |
| Answer» D. Noise | |