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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.
| 5251. |
A super heterodyne receiver has a IF of 465 kHz. It is tuned to a station broadcasting at 500 KHz and its oscillator is operating at 965 KHz, then the 1330 KHz frequency would be |
| A. | adjacent channel frequency |
| B. | image frequency |
| C. | gyro frequency |
| D. | maximum usable frequency |
| Answer» C. gyro frequency | |
| 5252. |
Following are the properties of impulse function x(t) (t) = x (0) (t) (- t) = (t) Choose the correct option |
| A. | 1-true, 2-false, 3-true |
| B. | 1-false, 2-true, 3-true |
| C. | 1-true, 2-true, 3-true |
| D. | 1-true, 2-true, 3-false |
| Answer» D. 1-true, 2-true, 3-false | |
| 5253. |
A single mode fibre not suffer from which type of dispersion? |
| A. | Waveguide dispersion |
| B. | Material dispersion |
| C. | Intermodal dispersion |
| D. | Polarization mode dispersion |
| Answer» D. Polarization mode dispersion | |
| 5254. |
Which of the following statements is/are true for a good conductor of electricity? Its conductivity decreases with increasing temperature.Number of free electrons is around 1028 m-3.Its conductivity decreases with addition of impurities.It is a good conductor of heat also. |
| A. | 1, 2, 3 and 4 |
| B. | 1 only |
| C. | 2 and 3 only |
| D. | 3 and 4 only |
| Answer» B. 1 only | |
| 5255. |
How can the bandwidth of a control system be increased? |
| A. | By the use of phase lead network |
| B. | By the use of phase lag network |
| C. | By the use of both phase-lag and phase-lead network |
| D. | By the use of cascaded amplifiers in the system |
| Answer» B. By the use of phase lag network | |
| 5256. |
If an electric network R, L and C are connected in series and supplied by a voltage source then its dual network will be described by the differential equation: |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-04-54-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-04-54-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-04-54-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-04-54-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-04-54-4.png"> | |
| 5257. |
A signal x1(t) and x2(t) constitute the real and imaginary parts respectively of a complex valued signal x(t). What form of waveform does x(t) possess? |
| A. | Real symmetric |
| B. | Complex symmetric |
| C. | Asymmetric |
| D. | Conjugate symmetric |
| Answer» E. | |
| 5258. |
Hysteresis loss in a transformer working at 220 V and at a frequency of 50 Hz is 100 W. When the transformer is operated at 220 V and at a frequency of 100 Hz, what is the hysteresis loss? |
| A. | 50 W |
| B. | 100 W |
| C. | 200 W |
| D. | 400 W |
| Answer» B. 100 W | |
| 5259. |
At 20 GHz , the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is |
| A. | 15 dB |
| B. | 25 dB |
| C. | 35 dB |
| D. | 45 dB |
| Answer» D. 45 dB | |
| 5260. |
The output corresponding to the figure shown below is : |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-02-20-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-02-20-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-02-20-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-02-20-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/15-02-20-4.png"> | |
| 5261. |
For pole-zero plot shown, the system is __________ . |
| A. | minimum phase |
| B. | maximum phase |
| C. | mixed phase |
| D. | none of these |
| Answer» B. maximum phase | |
| 5262. |
Which of the following equations results from the circuital form of Ampere's law? |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-05-73-1.png"> |
| B. | . B = 0 |
| C. | . B = |
| D. | <span class="symbol">r</span> |
| E. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-05-73-4.png"> |
| Answer» E. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/8-05-73-4.png"> | |
| 5263. |
Which one of the following is not LED material? |
| A. | GaAs |
| B. | GaP |
| C. | SiC |
| D. | SiO |
| E. | <sub>2</sub> |
| Answer» E. <sub>2</sub> | |
| 5264. |
Consider the following statements: A flip-flop is used to store 1-bit of information. Race-around condition occurs in a J-K flip-flop when both the inputs are 1. Master-slave configuration is used in flip-flops to store 2-bits of information A transparent latch consists of a D-type flip-flop. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 1, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 2 and 3 only |
| Answer» D. 2 and 3 only | |
| 5265. |
A balanced modulator is used in the generation of which of the following? |
| A. | DSB-SC signal |
| B. | FM signal |
| C. | PM signal |
| D. | PAM signal |
| Answer» B. FM signal | |
| 5266. |
Consider the following network functionIn order to make N(s) as rational network function, it is essential to include |
| A. | zero at origin |
| B. | zero at infinity |
| C. | pole at origin |
| D. | pole at infinity |
| Answer» C. pole at origin | |
| 5267. |
With reference to C programming language, which of the following statements are correct? An identifier may start with an underscore.An identifier may end with an underscore.If is a valid identifier.The number of significant characters in and identifier is implementation dependent. Select the correct answer from the codes given below: |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1, 2, 3 and 4 |
| D. | 3 and 4 only |
| Answer» D. 3 and 4 only | |
| 5268. |
Given a unity feedback system with open-loop transfer function, The root locus plot of the system is of the form : |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-44-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-44-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-44-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-44-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-44-3.png"> | |
| 5269. |
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. | |
| 5270. |
How many and which types of machine cycles are needed to execute PUSH PSW by 8085 microprocessor? |
| A. | 2, Fetch and memory write |
| B. | 3, Fetch and memory write |
| C. | 3, Fetch and memory read |
| D. | 3, Fetch and memory read and memory write |
| Answer» B. 3, Fetch and memory write | |
| 5271. |
Consider the following statements: Taking 2's complement is equivalent to sign change.In the 2's complement representation the most significant bit (MSB) is zero for a positive number.In a 4 bit binary representation of a binary number A, A + 1's complement of A = 24. Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 5272. |
Consider the following statements: Strictly speaking C supports 1-dimensional arrays only.An array element may be an array by itself.Array elements need not occupy contiguous memory locations. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 1 and 2 |
| D. | 2 and 3 |
| Answer» C. 1 and 2 | |
| 5273. |
Assertion (A): A rectifier with inductor filter is more efficient for high load current.Reason (R): In rectifier with inductor filter we can use a larger choke to reduce ripple, larger choke will have higher dc resistance which will result in lower dc output voltage for higher load current. |
| 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» B. Both A and R are individually true but R is not the correct explanation of A | |
| 5274. |
Consider the following circuit using an ideal OP-AMP. The I-V characteristics of the diode is described by the relation where VT = 25mV, I0 = 1mA and V is the voltage across the diode (taken as positive for forward bias). For an input voltage V1 = - 1 V, the output voltage V0 is |
| A. | 0 V |
| B. | 0.1 V |
| C. | 0.7 V |
| D. | 1.1 V |
| Answer» C. 0.7 V | |
| 5275. |
Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown? |
| A. | Only P has no cutoff- frequency |
| B. | Only Q has no cutoff- frequency |
| C. | Only P has no cutoff- frequency |
| D. | All there have cut-off frequency |
| Answer» B. Only Q has no cutoff- frequency | |
| 5276. |
Consider the following: Coupling capacitorEmitter by-pass capacitorEmitter to base diffusion capacitance of the BJTStray capacitance of the circuit. Which of these components in a R-C coupled amplifier control the lower cut-off frequency of the amplifier? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | l and 4 |
| Answer» B. 2 and 3 | |
| 5277. |
Consider differential equation with the initial condition y(0) = 0. Using Euler's first order method with a step size of 0.1, the value of y(0.3) is |
| A. | 0.01 |
| B. | 0.031 |
| C. | 0.0631 |
| D. | 0.1 |
| Answer» C. 0.0631 | |
| 5278. |
Assertion (A): A z-directed rectangular waveguide with cross-sectional dimensions 3 cm x 1 cm will support propagation at 4 GHz.Reason (R): where is the wavelength. |
| 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. | |
| 5279. |
By what name is the equation . J = 0 frequency known? |
| A. | Poisson's equation |
| B. | Laplace's equation |
| C. | Continuity equation for steady currents |
| D. | Displacement equation |
| Answer» D. Displacement equation | |
| 5280. |
The transfer function of a controller is given as Kp + Kd.s + where Kp, Kd and Ki are constants. What type of controller is this? |
| A. | Proportional |
| B. | Proportional plus derivative |
| C. | Proportional plus integral |
| D. | Proportional plus integral plus derivative |
| Answer» E. | |
| 5281. |
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. | |
| 5282. |
Which one of the following statements is correct for MOSFETS? |
| A. | p channel MOS is easier to produce than n channel MOS |
| B. | n channel MOS must have twice the area of p channel MOS for the same ON resistance |
| C. | p channel MOS has faster switching action than n channel MOS |
| D. | p channel MOS has higher packing density than n channel MOS |
| Answer» B. n channel MOS must have twice the area of p channel MOS for the same ON resistance | |
| 5283. |
The full form of the abbreviations TTL and CMOS in reference to logic families are |
| A. | Triple Transistor Logic and Chip Metal Oxide Semiconductor |
| B. | Tristate Transistor Logic and Chip Metal Oxide Semiconductor |
| C. | Transistor Transistor logic and Complementary Metal Oxide Semiconductor |
| D. | Trisate Transistor Logic and Complementary Metal Oxide Silicon |
| Answer» D. Trisate Transistor Logic and Complementary Metal Oxide Silicon | |
| 5284. |
In which one of the following types of analog to digital converts the conversion time is practically independent of the amplitude of the analog signal? |
| A. | The dual slope integrating type |
| B. | Successive approximation type |
| C. | Counter ramp type |
| D. | Tracking type |
| Answer» C. Counter ramp type | |
| 5285. |
Consider the following statements:The conductivity of a metal has negative temperature coefficient since: The electron concentration increases with temperature.The electron mobility decreases with temperature.The electron-lattice scattering rate increases with temperature. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» D. 3 only | |
| 5286. |
Consider a random noise voltage which has a uniform density function as shown in the figure and is known to be white.If the noise is the first quantized into 0.1 V steps, starting at 0 V level, and then readings made of 10 per second. The information content of the reading is : |
| A. | 2 bits/reading |
| B. | 5 bits/reading |
| C. | 10 bits/reading |
| D. | none of these |
| Answer» C. 10 bits/reading | |
| 5287. |
Consider the following statements:The bias stability of an emitter-bias amplifier circuit improves by decreasing the value of RBincreasing the value of REdecreasing the value of RBincreasing the value of RBincreasing the value of RC Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 4 and 5 |
| Answer» B. 2 and 3 | |
| 5288. |
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 | |
| 5289. |
Which device can detect the presence of both forward and backward waves in a waveguide? |
| A. | Filter |
| B. | Detector |
| C. | Directional coupler |
| D. | Magic T |
| Answer» D. Magic T | |
| 5290. |
Polarization is a measure of |
| A. | dielectric constant per unit volume |
| B. | voltage gradient to produce electrical breakdown |
| C. | product of charge and distance |
| D. | excess charge density |
| Answer» B. voltage gradient to produce electrical breakdown | |
| 5291. |
The transfer function of a closed loop system is where K is the forward path gain. The root locus plot of the system is : |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-42-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-42-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-42-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-42-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-42-3.png"> | |
| 5292. |
Consider the following statements, regarding an OP AMP: All types of negative feedback reduce non-linear distortion.All types of negative feedback reduce the output offset voltage.Non-inverting (current and voltage) feedback increases the input impedance.Inverting (current and voltage) feedback decreases input impedance. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 and 3 only |
| C. | 2 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 5293. |
The fuse material used in electrical lines must have which one of the following properties? |
| A. | High resistivity |
| B. | Low conductivity |
| C. | High melting point |
| D. | Low melting point |
| Answer» E. | |
| 5294. |
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 | |
| 5295. |
For detecting a sequence 1011 which is the correct state diagram representation. |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-68-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-68-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-68-3.png"> |
| D. | none of these |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-68-3.png"> | |
| 5296. |
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. | , x, x |
| C. | x, , x |
| D. | 0, x, |
| Answer» C. x, , x | |
| 5297. |
In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if |
| A. | radius as well as operating wavelength are halved |
| B. | radius as well as operating wavelength are doubled |
| C. | radius is halved and operating wavelength is doubled |
| D. | radius is doubled and operating wavelength is halved |
| Answer» C. radius is halved and operating wavelength is doubled | |
| 5298. |
Signal x(t) is shown below: The values of `t' for which x(3t - 2) will be zero are: |
| A. | 0, |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-42-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-49-2.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-49-3.png"> |
| E. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-49-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-746-49-2.png"> | |
| 5299. |
The maximum concentration of the element which can be dissolved in solid silicon at a given temperature is termed as |
| A. | Solid solubility |
| B. | Dissolution coefficient |
| C. | Solidification index |
| D. | Concentration index |
| Answer» C. Solidification index | |
| 5300. |
What is the purpose of DMA facility in microprocessor based system? |
| A. | To increase the speed of data transfer between the mP and the I/O devices |
| B. | To increase the speed of data transfer between the mP and the memory |
| C. | To increase the speed of data transfer between the memory and the I/O devices |
| D. | To improve the reliability of the system |
| Answer» D. To improve the reliability of the system | |