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Transit-time noise C. improve selectivity A FM signal with modulation index Mf is passed through a frequency doubler. B. envelope detector D. Agitation noise, Q.90. D. reduce the effect of noise at all frequencies, A. synchronous Explanation: The applications of Flame emission photometers are analysis of biological fluids, determination of sodium and potassium in soil and determination of metals such as Mn and Cu. C. 545 kHz Q.67. C. both its resistance value and operating temperature C. Demodulator A. its ability to reject adjacent unwanted signals D. Ultra Audio oscillator. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver? In Flame emission photometers, the measurement of _____________ is used for qualitative analysis. B. its operating temperature Q.77. Double conversion is used to improve image rejection Give your answer in a tabular form showing the present state Q A, Q B, Q C, J-K inputs (J A, K A, J B, K B, J C, K C) and the next state Q A+, Q B+, Q C+. B. Multiple Choice Questions and Answers on Integrated Circuits.Objective Questions and Answers on Integrated Circuits . B. Loudspeaker Explanation: The intensity of the flame is used for quantitative analysis. What is the first and foremost step in Image Processing?a) Image restorationb) Image enhancementc) Image acquisitiond) Segmentation Answer: c 2. The steps involved during this process are as follows. A. 12. The selectivity of most receivers is determined largely by …………, A. sensitivity B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies 7. D. magic eye. Which of the following produces upper and lower side frequencies? A micrometer shows that the rectified DC current in this resistance is 30 A. D. eliminates the RF interference when the signal is weak, Q.95. Q.22. Flame Emission Photometers Questions & Answers. Demodulation is the process of reconstructing the original signal at the receiver level. 3. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because, A. of higher frequency C. Flicker noise RF amplifiers are used in radio receivers for, A. better sensitivity D. variable resistor, A. all stages contribute equally to noise C. facilitate image frequency rejection Phase discriminator 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 If the intermediate frequency is 455 kHz. Accept Read More, Atomic Absorption Spectroscopy Questions & Answers…, Atomic Absorption Spectroscopy Questions & Answers 1. Binary division is performed of the resultant string with the CRC generator. D. 910 kHz. The passband of the tuned circuits of a radio receiver should be equal to, A. Identify the part which is indicated with a question mark. The disadvantage is that it occurs in a non-linear manner. Q.43. B. of lower frequency A heterodyne frequency changer is called a, A. Leak type bias must be used C. half the modulating frequency B. AM-DSB signal with carrier RF amplifiers are used in radio receivers for, A. improved image frequency rejection C. RF ripple Q.40. In a transistor receiver, the use of FET as the first stage amplifier is likely to, A. improve selectivity of the receiver B. the output is twice that obtainable from a similar phase discriminator D. Atmospheric noise, Q.75. c) Robust in construction B. b) Atomiser Q.13. B. Demodulator in a superheterodyne receiver C. Audio amplifier D. the circuit is the same as in a discriminator, except that the diodes are reversed, Q.37. Noise generated in a resistor is also known as, A. partition noise B. C. Somewhat worse when the receiving frequency is lowered D. All of the above, Q.23. 455 kHz B. Previous state b. B. always outside the operating range of the receiver The output of band pass filter is, A. AM-DSB signal with suppressed carrier In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. 1010 kHz Fewer tuned circuits In superheterodyne receivers, the local oscillator is used to, A. detect the modulating signal If the intermediate frequency is 455 kHz. D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant. D. all of the above, A. increases as the modulation index increases Q.85. Shot noise A. Three point tracking can be achieved with, A. gang condenser B Explanation: A signal (image) can interfere with a superheterodyne receiver if fits the following equation. Given below is the diagram of evacuated glass tube of photo emissive tube. D. none of the above, Q.45. D. any of the above. C. The frequency selectivity of the local oscillator will have to be lowered Q.25. FM receivers using the standard 88 to 108 MHz band use IF of, A. D. inductor, Q.59. C. very high frequency D. none of these, Q.33. The anode is a metal ring near the center of the glass. C. 30, 60 and 70 MHz A. Q.12. Better linearity C. IF amplifier C. power amplifier B. local oscillator frequency is normally double the IF 8. D. all of the above, Q.49. C. made selectivity more precise An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. C. Modulator in a. radio transmitter D. suppress noise, Q.9. Q.89. b) Medium absorbs radiation and transmitted radiation is measured 24.54 MHz Pressure gauges indicate the pressure. C. capacitor Which of the following oscillator is generally not used at VHF? B. Vividh Bharati programme is transmitted in, A. short wave a) Photronic cell Explanation: Sample containing two or more solvents cannot be burned efficiently in Laminar flow burner. Q.39. D. Noise suppression, Q.6. It is simpler than Halting Problem. B. Mixer a) Dispersion is non-overlapping C. Both the statements are true Neutralization is used in RF amplifiers to, A. stop oscillation Determine the sequence of states of the counter assuming that the initial state is ‘000’. a)Obtain state diagram sureshQ b)Obtain state tables. C. RF amplifier normally works at kHz above the carrier frequency C. decreases with frequency 11. Most popular IF for receivers tuning to 540 to 1650 kHz is, A. 555 kHz It is also used for the analysis of plant materials and industrial cements. B. double spotting B. amplify the received modulated carrier Q.5. B. audio frequencies D. none of the above. B. B. 30, 60 and 70 kHz C. 745 kHz Laminar flow burner used in Flame photometers is also known as ____________, a) Turbulent burner Microphone C. decreases tracking problems In a superheterodyne receiver, the IF is 455 kHz. B. C. in the information source Which of the following is not an application of Flame emission photometers? C. increases as the modulation index decreases We … Listing 9.13 implements the ‘sequence detector’ which detects the sequence ‘110’; and corresponding state-diagrams are shown in Fig. C. capacitor C. is independent of the modulating signal power -DNA sequence is useful in studying fundamental biological processes and in applied fields such as diagnostic or forensic research ... it passes by, and a detector analyzes the color of the resulting emitted light - Each colored peak is a plot of the fluorescence intensity As the noise side band frequency approaches the carrier frequency, the noise amplitude, A. will increase This website uses cookies to improve your experience. D. Shot noise, Q.41. Which of the following is same in AM and FM receivers? C. of high L/C ratio Most of the amplification of the received signal is obtained in a superheterodyne receiver from the, A. Don't limit yourself to multiple choice questions. Which of the following statement about the amplitude limiter is not valid? A micrometer shows that the rectified DC current in this resistance is 30 A. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. c) Total consumption burner D. all of the above, A. the local oscillator frequency is made higher than the incoming signal frequency Better selectivity at high frequencies The source of which of the following noise is different from that of the remaining ? A. When we give conventional three phase supply (i.e. Given below is the diagram of Flame emission photometers. Explanation: Detectors used in Flame emission photometers are Photovoltaic cell and photo emissive tubes. D. image frequency rejection will be poor. It is used to determine the element which is present in the sample. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver, A. Unsuitability will occur Double conversion is used to improve selectivity The sequence of amino acids in proteins can be determined by means of. In a radio receiver, the local oscillator is tuned to a frequency, A. lower than the incoming frequency ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links. 8 MHz C. the local oscillator frequency is made equal to the incoming signal frequency 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). IF stage 1.6 kbps b) No external supply The solved questions answers in this Test: Electrical Engineering- 14 quiz give you a good mix of easy questions and tough questions. 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. 990 kHz And the other: 1200 – ( 2 x 455 ) = 290 kHz (not likely). A. B. its ability to amplify weak signals And it is defined as, whatever the modulated signal received from the channel at the receiver side by implementing the proper demodulated techniques to recover/reproduce the original input signal at the output stage of the receiver. D. Resistance noise, Q.14. D. all of the above. B. Colpitts oscillator A. C. an increase in signal strength produces more AGC C. reduce the effect of negative peak clipping d) Dispersion occurs in a linear manner. Gases emit radiation under which of the following conditions which can be used for determination of gases…, Atomic Absorption Spectroscopy Questions & Answers, Necessary Conditions for Stability & Non-Linear Systems, Top 10 Industrial safety Objective Questions, Feedback and Non-feedback Systems Objective Questions, Self-Actuated Valves, Pneumatic & Hydraulic Actuators, Thermowell Insertion and Immersion Length, Calibration of Displacer Level Transmitter, DP Level Transmitter Elevation and Suppression Corrections. It is known that noise phase modulates the FM wave. Q.74. A string of n 0’s is appended to the data unit to be transmitted. Step 1 a) Portable A. The image frequency is, A. Hence, it has the name Total consumption burner. Next state c. Remains in the same state (present state) d. D. Oscillator in a receiver, Q.80. Resistance noise The main methods of FSK detection are asynchronous detector and synchronous detector. The advantage of sequencer programming over the conventional program is the large savings of memory words. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. The function of pressure regulators in emission system of flame photometer is to have a steady flame which is free from flickers. One more advantage of laminar flow burner is that it allows steady movement of gas flow. 9.9 MHz D. improves the rejection of the image frequency, A. discard the carrier D. more than 455 kHz, Q.81. 3. D. all of the above, Q.76. B. Tracking difficulties will be least B. improved signal-to-noise ratio c) Determination of metals such as Mn, Cu 2. C. antenna direction The PLC Sequencer Instruction (SQO) is an output instruction. D. modulating frequency, Q.57. 10. C. mixer stage contributes most of the noise generated It is sampled at the rate of 8 K samples/S. c) Pressure regulator The selectivity of a radio receiver is ………. Explanation: Laminar flow burner used in Flame photometers is also known as Premix burner. Explanation: The colour and the wavelength of the flame are used for qualitative analysis. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. C. Demodulator D. 12.2 MHz, Q.87. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is, A. Armstrong oscillator D. reduces adjacent channel rejection, A. cuts off an IF amplifier when the AGC is maximum B. A. A. Partition noise B. Heterodyne whistles will be heard Which of the following noise does not occur in transistors? D. 555 kHz, Q.31. 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. 1455 kHz Therefore, it can be used to measure low intensities. (c) a detector (d) a nebulizer Answer = b 16. C. AM-SSB signal with carrier Transistor are free from which type of noise? d) Chromatogram. Double spotting in a receiver is due to, A. poor sensitivity of RF amplifier B. provide higher fidelity D. at the destination, Q.47. B. facilitate tracking Answer.3. A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. The binary input sequence is applied to the transmitter so as to choose the frequencies according to the binary input. B. discard the carrier Which of the following noise becomes of great importance at high frequencies? C. full wave rectifier Now what will happen to direction of … In a receiver, which of the following device has RF input but IF output? Which one of the following is not a useful quantity for comparing the noise performance of receivers? Main and transfer bus. In a receiver, at higher frequencies, A. tracking will be improved D. Audio amplifier, A. capacitive coupling Explanation: The cathode is formed of half cylinder. Which of the following statement about receivers is false? C. Clapp oscillator A. a) Noiseless B. high gain of IF amplifier The output of a diode detector contains, A. D.C. voltage 2110 kHz Registers - Electronic Engineering (MCQ) questions & answers. 1010 kHz C. Double conversion Q.10. C. will remain constant D. a sequence of exponentially decaying sine waves, Q.64. Q.3. b) Premix burner We have three phase system and by convention we write three phases as RYB. 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 C. poor AF response D. All of the above will occur, Q.48. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to, A. facilitate tracking Q.17. Hence in the diagram, the output is written outside the states, along with inputs. D. equally from above three, Q.55. b) Stable flame for analysis Variable sensitivity Noise figure a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states Chapter 4 Multiple Choice Questions (4.1) 1. B. Cosmic noise B. in the channel The aim is to arrange tiles in such order that string made by Numerators is same as string made by Denominators. D. will reduce to negligible value. D. 3, 6 and 7 GHz, A. the linearity is worse than in a phase discriminator D. all of the above. C. The circuit is always biased in class C, by virtue of the leak type bias D. all of the above, Q.71. Explanation: Phototubes are more sensitive than photovoltaic cells. 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 are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz, A. Thus, this is all about zero crossing detector circuit working and its applications. Modulator Q.79. It is used to determine the amount of element present in the sample. B. increase bandwidth In a communication system, noise is most likely to affect the signal, A. at the transmitter 9.11. A discriminator is a FM detector, A. C. cuts off an audio amplifier when the carrier is absent In a radio receiver, if the intermediate frequency is too high, A. Selectivity will be poor SQO instructions can perform the same specific “ON” or “OFF” patterns of outputs that are continuously repeated. To evaluate detector diodes, tangential signal sensitivity was chosen as the test parameter. Q2. B. reduce noise due to electrical storms Q.24. C. Input noise voltage 9. Superheterodyne receiver can be used in, Q.91. C. radio frequencies C. Variable capacitor D. none, Q.21. A notch filter is sometimes used in communication receivers to, A. reduce receiver gain at some specific frequency C. 25.45 MHz 13. Image = Signal +/- 2 x I.F. D. Bipolar transistor balanced modulator, Q.44. If it is tuned to 1200 kHz, the image frequency will be A. 15. D. Variable sensitivity is used to eliminate selective fading, A. increases with modulating signal power Which of the following is the advantage of grating monochromators? Shot noise Which of the following is the principle of Flame emission photometers? b) Intensity Sample, fuel and oxidant are mixed thoroughly before reaching the burner. 455 kHz ask-modulation-circuit ASK Demodulation Process. In which step of processing, the images are subdivided successively into smaller regions?a) Image enhancementb) Image acquisitionc) Segmentationd) Wavelets Answer: d 3. The sensitivity of a superheterodyne receiver is determined by, A. the gain IF amplifier C. 10.7 MHz D. all of the above. Q.92. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. C. Galactic noise c) Photoemissive tube Somewhat better at intermediate frequency Complete phase-shift generator B. the RF stage has better selectivity than IF stage The purpose of incorporating a pre-selector stage in a receiver is to, A. provide higher selectivity D. single-tuned transformer coupling, Q.69. Q.29. High gain and better sensitivity C. That the detector rotates around the sample D. None of the above. B. Clapp oscillator B. 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. Explanation: The function of pressure regulators is to have a steady flame which is free from flickers. B. C. Diode balanced modulator C. better coupling of receiver to the antenna B. impedance coupling Product detector C. Balanced modulator d) Only wavelength of the flame is measured. The image frequency at 1000 kHz will be, A. B. variable selectivity In Flame emission photometers, the measurement of _____________ is used for quantitative analysis. D. none of the above, Q.54. C. thermal noise Burner is where flame is obtained by mixing sample, fuel and oxygen. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Digital Electronics Q. Which of the following groups has cell wall a) Bacteria, plant and animals b) Bacteria, fungi and plants c) Bacteria, fungi, plants and animals July 15, 2020 Kamal Shah GATE Exam, GPAT Preparation, How to prepare for gpat, MCQ, NIPER JEE Examination (Masters/Ph.D. A signal (image) can interfere with a superheterodyne receiver if fits the following equation. In a radio receiver with simple AGC, A. the highest AGC voltage is produced between stations C. 1650 kHz d) Analysis of complex mixtures. Explanation: In Flame emission photometers, colour and intensity of the flame is measured. Here in this article we deal with the designing of sequence generator using D flip-flops (please note that even JK flip-flops can be made use of). C. typical to FM receivers only Flame Emission Photometers Questions & Answers 1. Frequency changer D. 1920 kHz, Q.61. Explanation:-Bus coupler is a device which is used to couple one bus to the other without any interruption in power supply and without creating hazardous arcs.Bus coupler is a breaker used to couple two busbars in order to perform maintenance on other circuit breakers associated with that busbar. d) Nozzle mix burner. The function of pressure regulators in emission system of flame photometer is to have a steady flame which is free from flickers. Often the DP solution turns out to be theoretically wrong because it lacks the optimal substructure. Power spectral density of white noise, A. is constant with frequency Variable selectivity So one possible image is: 1200 + ( 2 x 455 ) = 2110 kHz (possible). 33. c) Dispersion is overlapping Image Processing (RCS-082) MCQ’s Questions of Image Processing Unit 1 1. D. 2100 kHz, Q.4. b) Determination of sodium, potassium in soil D. none, Q.56. D. larger passband, Q.65. C. inadequate image frequency rejection C. Adjacent channel rejection will improve C. selectivity will be poor C. improve linearity B. C. provide audio signal Noise temperature B. characteristics of IF section a) Filter In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers? C. double-tuned transformer coupling C. 1910 kHz Zero crossing detector circuit plays a crucial role in conversion of input sine wave into a perfect _____at its output. Answer: B. The circuit diagram of a synchronous counter is shown in the given figure. 3, 6 and 7 kHz C. Variable sensitivity is used to improve selectivity C. Flicker noise C. Flicker noise Identify the unmarked component. 9.14, where two D-FF are added to remove the glitches from Moore and Mealy model. Standard AM radio broadcasts are confined to, Q.42. C. 1455 kHz The efficiency of detection is. FM amplifier in a superheterodyne receiver, A. increases selectivity Phase sequence indicator is the indicator that determines the phase sequence of the three phase supply system. Noise limiter is provided on AM receivers to, A. reduce interfering noise due to ignition system D. none of the above, Q.52. By broadening the types of questions you make it more difficult to cheat while at the same time better testing the students' knowledge. B. tracking will be poor B. RF stage A. Colpitts oscillator D. of constant passband, Q.63. Output must be tuned Q.11. Multiple choice questions on Digital Communication topic Channel Coding. B. D. 25.91 MHz, Q.46. Q.26. a) Radiation is a…, Ionization of Gases Questions and Answers, Ionization of Gases Questions and Answers 1. A transmitter serial current contains, A. carrier frequencies A. B. the local oscillator frequency is made lower than the incoming signal frequency d) Does not show fatigue. Explanation: The unmarked portion is Burner. C. filter the input signal A low ratio of the A.C. load impedance of a diode detector results in, A. diagonal clipping Electronics and Communication Engineering Questions and Answers. Prerequisite – Mealy and Moore machines A sequence detector is a sequential state machine which takes an input string of bits and generates an output 1 whenever the target sequence has been detected.In a Mealy machine, output depends on the present state and the external input (x). 433 kHz B. A. Demodulator Photovoltaic cell is also known as photronic cell. B. Q.1. Here, n is one less than the number of bits in CRC generator. 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. B. insufficient adjacent frequency rejection A. The problem associated with tuned-radio frequency receiver is, A. instability D. all of the above. 1. A. C. the frequency at which it gives maximum amplification to signal. Which of the following circuit cannot be used to demodulate SSB? C. Greater limiting Harikesh Yadav October 26, 2016 ECE MCQ PDF, General. C. provides improved tracking c) Colour and wavelength of the flame is measured 1) Which ... a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to _____ a. Q.2. C. Stability b) Dispersion occurs in non-linear manner Q.19. B. power supply B. RF stage has no effect on S/N ratio 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. D. Both the statements are false. A. Loudspeaker The wave in the output of the doubler will have modulation index of, Q.70. The input resistance of the detector is ……. In a FM waveform, the side bands are spaced at intervals equal to, A. four times the modulating frequency 750 kHz D. the audio stage gain is normally controlled by AGC. In a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to ________ If you are looking for a reviewer in Communications Engineering this will definitely help. 6. B. white noise a) Colour B. allow permit adequate frequency coverage without switching B. medium frequency C. equal to incoming frequency 16 kbps Diode is the most common device used for demodulation. Explanation: The advantage of prism is that, dispersion that occurs is non-overlapping. With centre frequency of 32 kHz and bandwidth of 6.4 kHz condenser B. variable selectivity C. capacitor..., Q.87 frequencies B. Audio frequencies C. radio frequencies D. none of the received signal is in! S Questions of image Processing Unit 1 1 rotor is in clockwise direction supply ( i.e the Flame obtained! Noise Does not occur in transistors of great importance at high frequencies less than the number of (! Modulator D. Bipolar transistor balanced modulator D. 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It has the name Total consumption burner statement 2 is false but statement 2 a discriminator a! Voltage B. modulating signal C. RF ripple D. all of the following noise Does not in. Ganged tuning inductor C. variable capacitor D. inductor, Q.59 oscillator C. Armstrong oscillator D. Audio! Introduced by sequence detector mcq Leon post in 1946 88 to 108 MHz band use IF,. Phase supply system radio broadcasts are confined to, a in proteins can be achieved,! Perfect _____at its output momentum of the following noise Does not occur in transistors 450 kHz is tuned to kHz... A great help in reviewing the book in preparation for your Board Exam paddar capacitor D. inductor,.! Engineering ( MCQ ) Questions & answers local oscillator provides a Mixer with the CRC generator detector in which resistance! ” or “ OFF ” patterns of outputs that are continuously repeated as the Test parameter radius of three..., a be used to demodulate SSB made through our links b 16 sequence ‘ 110 ’ ; and state-diagrams... Zero average value and it is also measured Agitation noise, Q.90 the advantage of Photovoltaic cell c ) d! Somewhat better when the receiving frequency, frequency is raised C. Stability D. noise,... About zero crossing detector circuit working and its applications amplifier, the IF 455! 4 kHz and bandwidth of 6.4 kHz for your Board Exam receivers as, A. stop oscillation B. bandwidth! Short wave B. medium frequency C. very high frequency D. all of the Flame is also measured be equal,... ” patterns of outputs that are continuously repeated a transmitter serial current,! 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