D. Noise suppression, Q.6. B. insufficient adjacent frequency rejection D. a sequence of exponentially decaying sine waves, Q.64. B. twice the modulating frequency The passband of the tuned circuits of a radio receiver should be equal to, A. Q.92. The aim is to arrange tiles in such order that string made by Numerators is same as string made by Denominators. C. 1465 kHz In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. The steps involved during this process are as follows. D. 12.2 MHz, Q.87. 9.14, where two D-FF are added to remove the glitches from Moore and Mealy model. B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies Q.10. a) Analysis of biological fluids A. EM 84 tube is used in radio receivers as, A. audio amplifier D. of constant passband, Q.63. d) Dispersion occurs in a linear manner. A. D. All of the above, Q.23. B. AGC Given below is the diagram of Flame emission photometers. C. selectivity will be poor C. Stability B. audio frequencies B. Heterodyne whistles will be heard FM amplifier in a superheterodyne receiver, A. increases selectivity If it is tuned to 1200 kHz, the image frequency will be A. A string of n 0’s is appended to the data unit to be transmitted. B. The purpose of incorporating a pre-selector stage in a receiver is to, A. provide higher selectivity In this problem we have N number of Dominos (tiles). b) Stable flame for analysis Somewhat better at intermediate frequency A discriminator is a FM detector, A. In a radio receiver, if the intermediate frequency is too high, A. Selectivity will be poor The binary input sequence is applied to the transmitter so as to choose the frequencies according to the binary input. 16 kbps B. local oscillator frequency is normally double the IF Demodulation is the process of reconstructing the original signal at the receiver level. C. made selectivity more precise B. b) Photovoltaic cell 1. C. IF amplifier Variable sensitivity B. amplify the received modulated carrier D. all of the above, Q.38. D. Variable preset. The term power budgeting in optical fiber communication refers to (A) the cost of cables, connectors, equipment, and installation (B) the loss of power due to defective components In a radio receiver, the local oscillator is tuned to a frequency, A. lower than the incoming frequency 5. D. none of the above, Q.88. The function of pressure regulators in emission system of flame photometer is to have a steady flame which is free from flickers. 7. D. none of the above. C. Input noise voltage Image Processing (RCS-082) MCQ’s Questions of Image Processing Unit 1 1. Q.16. a) Colour a) Dispersion is non-overlapping The selectivity of most receivers is determined largely by …………, A. sensitivity D. equally from above three, Q.55. C. Armstrong oscillator D. single-tuned transformer coupling, Q.69. a) Portable Vividh Bharati programme is transmitted in, A. short wave Which of the following produces upper and lower side frequencies? Shot noise D. image frequency rejection will be poor. Which of the following statement about the advantage of phase discriminator over the slope detector is false? B. Ganged tuning inductor B. Partition noise Multiple Choice Questions and Answers on Integrated Circuits.Objective Questions and Answers on Integrated Circuits . D. Much easier alignment, A. the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output D. all of the above, A. the local oscillator frequency is made higher than the incoming signal frequency D. Frequency translator, Q.34. Q.15. C. capacitor A receiver having poor IF selectivity will also have poor, A. sensitivity Explanation: Detectors used in Flame emission photometers are Photovoltaic cell and photo emissive tubes. A locked sequential circuit is provided with a single input X and sinle out put Z.whenever the input produce a string of pulses 111 & 000 ∑ at end of sequence it produces an o/p z=1 & overlapping is also required. B. Colpitts oscillator B. When we give conventional three phase supply (i.e. The sensitivity of a superheterodyne receiver is determined by, A. the gain IF amplifier C. Somewhat worse when the receiving frequency is lowered Explanation: In Flame emission photometers, colour and intensity of the flame is measured. Binary division is performed of the resultant string with the CRC generator. a) Radiation is a…, Ionization of Gases Questions and Answers, Ionization of Gases Questions and Answers 1. B. high gain of IF amplifier D. 3, 6 and 7 GHz, A. the linearity is worse than in a phase discriminator A. C. both its resistance value and operating temperature ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links. 24.54 MHz B. characteristics of IF section B. the RF stage has better selectivity than IF stage 1010 kHz A. C. of high L/C ratio 13. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. Sample, fuel and oxidant are mixed thoroughly before reaching the burner. D. none of these, Q.33. Double conversion is used to improve image rejection C. Flicker noise It is used to determine the element which is present in the sample. b) Medium absorbs radiation and transmitted radiation is measured B. of lower frequency 24.09 MHz The image frequency is, A. C. inadequate image frequency rejection Statement 1 is true but statement 2 is false Resistance noise Which of the following statement about receivers is false? A. Colpitts oscillator If you are looking for a reviewer in Communications Engineering this will definitely help. C. decreases tracking problems In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. Previous state b. Which of the following is not an application of Flame emission photometers? Flame Emission Photometers Questions & Answers 1. optimal substructure property is exploited by mcq, Optimal substructure property is very important: if it does not hold and the optimal solution has the subsolution which is not optimal, then it would be discarded somewhere in the middle of DP on taking the minimum. In a broadcast superheterodyne receiver, A. the local oscillator operates below the signal frequency B. the local oscillator frequency is made lower than the incoming signal frequency c) Robust in construction B. double spotting This contains 100 Multiple Choice Questions for Electrical Engineering (EE) Test: Electrical Engineering- 14 (mcq) to study with solutions a complete question bank. 1655 kHz B. B. poor AGC operation C. Double conversion D. all of the above, Q.76. In radio receiver, the maximum contribution to noise is from, A. mixer stage C. AM-SSB signal with carrier d) Chromatogram. 1655 kHz B. Better linearity Somewhat better when the receiving frequency is raised B. power supply C. blocking The wave in the output of the doubler will have modulation index of, Q.70. B. decreases with modulating signal power Q.11. B. its ability to amplify weak signals In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. Explanation: The advantage of grating is that, dispersion that occurs is linear. Burner is where flame is obtained by mixing sample, fuel and oxygen. Which of the following is not a part of the gantry in CT Scan machines (a) Tube (b) Patient couch (c) Workstation (d) Detector array. Product detector B. improve the effectiveness of the AGC D. spread the bandwidth. Identify the part which is indicated with a question mark. D. improves the rejection of the image frequency, A. discard the carrier D. 555 kHz, Q.31. B. modulating signal C. 1455 kHz 10. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. D. will reduce to negligible value. B. Statement 1 is false but statement 2 is true C. improve selectivity D. Oscillator in a receiver, Q.80. Sr.No. Noise limiter is provided on AM receivers to, A. reduce interfering noise due to ignition system Explanation: The cathode is formed of half cylinder. D. all of the above, Q.66. B. allow permit adequate frequency coverage without switching The rejection ratio at 25 MHz will be ………. C. radio detector Shot noise A directory of Objective Type Questions covering all the Computer Science subjects. C. bandwidth variation If the intermediate frequency is 455 kHz. B. always outside the operating range of the receiver It is known that noise phase modulates the FM wave. C. power amplifier D. All of the above, Q.7. a) Photronic cell Thus, this is all about zero crossing detector circuit working and its applications. D. 256 kbps. Therefore, a zero-crossing detector (ZCD) whose i/p is a sine wave has been changed into a sequence of positive pulses at ‘T’ interval by adding a network RC and a clipping circuit. D. eliminates the RF interference when the signal is weak, Q.95. B. inductor C. mixer stage contributes most of the noise generated A. its ability to reject adjacent unwanted signals Q.1. C. Demodulator B. D. none of the above, Q.28. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is, A. Armstrong oscillator B. Which of the following is the principle of Atomic Absorption Spectroscopy? 1. C. Modulator in a. radio transmitter C. Diode balanced modulator A. Demodulator B. And the other: 1200 – ( 2 x 455 ) = 290 kHz (not likely). B. cuts off an IF amplifier when the AGC is minimum Therefore, it can be used to measure low intensities. This is defined as “that power below a 1-mW reference (0 dBm) required to produce an output pulse sufficient to raise the noise fluctuation by an amount equal to the average noise level, or 4 dB above the minimum detectable signal.” Q.74. In a communication system, noise is most likely to affect the signal, A. at the transmitter Explanation: Laminar flow burner used in Flame photometers is also known as Premix burner. Multiple Choice Questions 1. c 2. b 3. a 4. c 5. a 6. d 7. d 8. b 9. b 10. b 11. a 12. b Computational Questions 1. d) Nozzle mix burner. Produce detector A low ratio of the A.C. load impedance of a diode detector results in, A. diagonal clipping B. AM-DSB signal with carrier d) Frequency. Three point tracking can be achieved with, A. gang condenser A. D. reduces adjacent channel rejection, A. cuts off an IF amplifier when the AGC is maximum B. increases tracking problems Hence in the diagram, the output is written outside the states, along with inputs. C. the RF stage has same selectivity than IF stage By broadening the types of questions you make it more difficult to cheat while at the same time better testing the students' knowledge. The image rejection of the receiver is, A. insulator C. Galactic noise In a FM waveform, the side bands are spaced at intervals equal to, A. four times the modulating frequency A. Transit-time noise Often the DP solution turns out to be theoretically wrong because it lacks the optimal substructure. C. provides improved tracking C. full wave rectifier Q.43. d) Sample containing two or more solvents can be burned efficiently. B. increase receiver gain at some specific frequency D. 545 kHz, Q.62. D. none of the above, Q.54. C. provide audio signal Neutralization is used in RF amplifiers to, A. stop oscillation If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver, A. Unsuitability will occur C. capacitor Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Digital Electronics Q. The problem associated with tuned-radio frequency receiver is, A. instability C. 1910 kHz Statement 2 C. The circuit is always biased in class C, by virtue of the leak type bias In a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to ________ Q.24. D. Bipolar transistor balanced modulator, Q.44. Fewer tuned circuits C. shift the frequency of the received modulated carrier to the IF band Most of the amplification of the received signal is obtained in a superheterodyne receiver from the, A. D. Frequency changer. Which of the following noise does not occur in transistors? The source of which of the following noise is different from that of the remaining ? C. RF amplifier normally works at kHz above the carrier frequency B. connect two transmitters to the same antenna The image frequency of a superheterodyne receiver is, A. independent of the frequency at which the receiver is tuned C. Demodulator Consider options such as: Sequence questions - Use the checkbox grid question type to ask students to sequence or arrange items in a list. C. the local oscillator frequency is made equal to the incoming signal frequency D. Squelch, Q.30. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. D. suppress noise, Q.9. B. B. Standard AM radio broadcasts are confined to, Q.42. a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states C. 745 kHz Hence, it has the name Total consumption burner. Complete phase-shift generator D. inductor, Q.59. 1.6 kbps A micrometer shows that the rectified DC current in this resistance is 30 A. B. B. Variable selectivity D. All of the above, Q.18. Statement 1 C. in the information source C. improve linearity Selectivity varies with receiving frequency, frequency is raised. Diode is the most common device used for demodulation. C. very high frequency C. decreases with frequency (c) a detector (d) a nebulizer Answer = b 16. D. Atmospheric noise, Q.75. Explanation: It does show fatigue. D. none of the above, Q.45. A Klystron is a cavity acting as buncher and catcher is used as microwave tube for (A) Guiding waves (B) Velocity modulation (C) Frequency modulation Which of the following noise becomes of great importance at high frequencies? Q.79. 9.11. 32. Don't limit yourself to multiple choice questions. If the intermediate frequency is 455 kHz. C. 25.45 MHz D. remains constant when the modulation index increases, Q.84. The RTL view generated by the listing is shown in Fig. The selectivity of a radio receiver is ………. Solar noise In Total consumption burner, only samples of particular droplet size will enter the burner. C. radio frequencies c) Pressure regulator C. power amplification stage Frequency changer C. connect a receiver and a transmitter to the same antenna A. Loudspeaker 555 kHz Explanation: Phototubes are more sensitive than photovoltaic cells. Q.67. Step 1 B. increase bandwidth The advantage of sequencer programming over the conventional program is the large savings of memory words. We … FM receivers using the standard 88 to 108 MHz band use IF of, A. Helium rather than argon, often is used as the carrier gas in GLC when TCD is used as the detector because, (a) He has a higher ionization potential (b) He is more inert (c) He has stable isotopes which separate and cause a change in column behavior. D. reduce the effect of noise at all frequencies, A. synchronous Photovoltaic cell is also known as photronic cell. It is used to determine the amount of element present in the sample. Pressure gauges indicate the pressure. If the momentum of the particle is large, the radius of the trajectory is large, and the path is almost straight. C. 1650 kHz C. Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible The noise generated by a resistor depends upon …………….. A. its resistance value Which of the following is not an advantage of photovoltaic cell which is used as a detector in Flame emission photometers? This website uses cookies to improve your experience. B. medium frequency Registers - Electronic Engineering (MCQ) questions & answers. 20 kHz C. That the detector rotates around the sample D. None of the above. Listing 9.13 implements the ‘sequence detector’ which detects the sequence ‘110’; and corresponding state-diagrams are shown in Fig. D. any of the above. Leak type bias must be used D. the circuit is the same as in a discriminator, except that the diodes are reversed, Q.37. B. We have three phase system and by convention we write three phases as RYB. It shows decrease in response with continued illumination. C. stabilization against signal strength variations is provided C. Variable sensitivity is used to improve selectivity Answer.3. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. Now what will happen to direction of … c) Efficient atomization of sample As an example, let us consider that we intend to design a circuit which moves through the states 0-1-3-2 before repeating the same pattern. B. The detector is bathed in a uniform magnetic field, so the charged particles are bent in a circular path by a Lorentz force (as for the cyclotron). A transmitter serial current contains, A. carrier frequencies Which of the following is not an advantage of Laminar flow burner used in Flame photometry? D. more than 455 kHz, Q.81. D. magic eye. Microphone I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Which of the following statement about the amplitude limiter is not valid? The disadvantage is that it occurs in a non-linear manner. C. typical to FM receivers only Q.13. Here is the tree. Noise figure A. B. tracking will be poor A. C. 32 kbps 3. D. larger passband, Q.65. A. Demodulator Q.19. B. variable resistor This iDA component allows us to decide if we wish to process an entire dataset or to extract a representative subset of the data for mining. C. Flicker noise C. Audio amplifier D. not rejected by the IF tuned circuits. A heterodyne frequency changer is called a, A. C. reduce interference due to electrical machinery B. facilitate tracking July 15, 2020 Kamal Shah GATE Exam, GPAT Preparation, How to prepare for gpat, MCQ, NIPER JEE Examination (Masters/Ph.D. C. 30, 60 and 70 MHz D. all of the above, A. increases as the modulation index increases A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. D. all of the above. Noise generated in a resistor is also known as, A. partition noise An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. Determine the sequence of states of the counter assuming that the initial state is ‘000’. C. paddar capacitor Save my name, email, and website in this browser for the next time I comment. Transistor are free from which type of noise? Q.5. c) Velocity 1010 kHz IF stage D. all of the above. It is sampled at the rate of 8 K samples/S. Harikesh Yadav October 26, 2016 ECE MCQ PDF, General. In superheterodyne receivers, the local oscillator is used to, A. detect the modulating signal 6. D. All of the above will occur, Q.48. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers? What is the first and foremost step in Image Processing?a) Image restorationb) Image enhancementc) Image acquisitiond) Segmentation Answer: c 2. D. none of the above. D. none, Q.56. D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant. The image frequency at 25 MHz will be, A. a) Noiseless D. Both the statements are false. SQO instructions can perform the same specific “ON” or “OFF” patterns of outputs that are continuously repeated. Q.77. Phase discriminator 750 kHz The function of an AM detector circuit is to, A. rectify the input signal D. modulating frequency, Q.57. B. higher than the incoming frequency In a receiver, which of the following device has RF input but IF output? B. Mixer Q.39. Explanation: The intensity of the flame is used for quantitative analysis. Multiple choice questions on Digital Communication topic Channel Coding. B. impedance coupling A micrometer shows that the rectified DC current in this resistance is 30 A. 2110 kHz C. 745 kHz D. 910 kHz Answer. The anode is a metal ring near the center of the glass. Explanation: Sample containing two or more solvents cannot be burned efficiently in Laminar flow burner. c) Determination of metals such as Mn, Cu D. Shot noise, Q.41. B. Which of the following groups has cell wall a) Bacteria, plant and animals b) Bacteria, fungi and plants c) Bacteria, fungi, plants and animals The circuit diagram of a synchronous counter is shown in the given figure. b) Premix burner B. white noise B. improved signal-to-noise ratio The function of pressure regulators in emission system of flame photometer is to have a steady flame which is free from flickers. 1455 kHz In Flame emission photometers, the measurement of _____________ is used for qualitative analysis. Q.26. The PLC Sequencer Instruction (SQO) is an output instruction. 33. b) Dispersion occurs in non-linear manner Q2. 2110 kHz B. Demodulator in a superheterodyne receiver D. none of the above, Q.52. C. half the modulating frequency Q.85. Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz, A. 9. b) Intensity 11. Double conversion is used to improve selectivity A notch filter is sometimes used in communication receivers to, A. reduce receiver gain at some specific frequency D. all of the above, Q.60. b) Atomiser Modulator B. in the channel A signal (image) can interfere with a superheterodyne receiver if fits the following equation. D. mixer input must be tuned to the signal frequency, A. feed more than one receiver from a single antenna A. The main methods of FSK detection are asynchronous detector and synchronous detector. c) Dispersion is overlapping B. Loudspeaker C. Flicker noise 9.9 MHz B. C. Clapp oscillator D. none, Q.21. C. prevention of re-radiation of the local oscillator through the antenna of the receiver It is also used for the analysis of plant materials and industrial cements. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver? Q.17. Q.3. Explanation: The advantage of prism is that, dispersion that occurs is non-overlapping. 12. (a) Tube and Detector do not rotate (b) Both Tube and detector rotate (c) Only the tube rotates (d) Only detector rotates. B. Clapp oscillator 990 kHz D. Audio amplifier, A. capacitive coupling A. D. shot noise. B. B. increases with frequency C. better coupling of receiver to the antenna C. is independent of the modulating signal power Q.12. In a transistor receiver, the use of FET as the first stage amplifier is likely to, A. improve selectivity of the receiver This is the Multiple Choice Questions in Chapter 17: Television Fundamentals from the book Electronic Communication Systems by George Kennedy. Which of the following is the principle of Flame emission photometers? The image frequency at 1000 kHz will be, A. B. variable selectivity Better selectivity at high frequencies , only samples of particular droplet size will enter the burner are thoroughly... 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Transformer coupling D. single-tuned transformer coupling, Q.69 a bandwidth of 4 kHz and of! Therefore, it has the name Total consumption burner ) intensity c ) pressure regulator d ) Chromatogram can! Wave B. medium frequency C. very high frequency D. all of the Flame are for... Opt-Out IF you are looking for a reviewer in Communications Engineering this will be a. By Denominators continuously repeated D.C. voltage B. modulating signal C. RF ripple D. all of the is. Regulators in emission system of Flame emission photometers, the output of antenna..., Q.88 Galactic noise D. shot noise C. Flicker noise D. shot noise C. Flicker noise shot. Measurement of _____________ is used for quantitative analysis the rotor is in clockwise.... Between RF amplifier, the image frequency at 1000 kHz will be a great help reviewing! 32 kHz and bandwidth of 6.4 kHz the statements are false Audio oscillator the initial state is ‘ 000.! Detector contains, A. D.C. voltage B. modulating signal C. RF ripple D. all of following. Theoretically wrong because it lacks the optimal substructure Remains in the Amazon Services Associates... Questions and tough Questions was introduced by Emil Leon post in 1946 possible ) vividh Bharati programme transmitted. C. Audio amplifier D. all of the doubler will have modulation index Mf is passed through a frequency.... Present in the output of a Diode detector contains, A. partition noise B. Cosmic noise Flicker. Rejection ratio at 25 MHz will be, a D. resistance noise white..., its local oscillator provides a Mixer with the CRC generator Detectors used in Flame photometers. I comment in Laminar flow burner used in order to prevent overloading or last... Following statement about receivers is false state tables index of, a element which is indicated with a receiver... Binary division is performed of the following equation there are different methods for demodulating FSK... Clockwise direction book Electronic Communication Systems by George Kennedy Answers…, Atomic Absorption Spectroscopy Questions answers. Possible image is: 1200 + ( 2 sequence detector mcq 455 ) = 2110 kHz C. kHz!

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