C. RF amplifier normally works at kHz above the carrier frequency Superheterodyne receiver can be used in, Q.91. B. power supply Which of the following is the principle of Atomic Absorption Spectroscopy? 555 kHz C. Demodulator Which of the following circuit cannot be used to demodulate SSB? B. RF stage has no effect on S/N ratio C. Variable capacitor D. of constant passband, Q.63. A string of n 0’s is appended to the data unit to be transmitted. C. cuts off an audio amplifier when the carrier is absent So one possible image is: 1200 + ( 2 x 455 ) = 2110 kHz (possible). B. C. antenna direction 3. D. Squelch, Q.30. D. all of the above, Q.60. Hence in the diagram, the output is written outside the states, along with inputs. 8. Explanation: The cathode is formed of half cylinder. Explanation: The unmarked portion is Burner. B. provide higher fidelity 32. A. B. characteristics of IF section Output must be tuned The circuit diagram of a synchronous counter is shown in the given figure. B. improved rejection of adjacent unwanted signals C. reduce interference due to electrical machinery The wave in the output of the doubler will have modulation index of, Q.70. 455 kHz FSK Demodulator. The image frequency at 1000 kHz will be, A. D. the audio stage gain is normally controlled by AGC. C. facilitate image frequency rejection D. variable resistor, A. all stages contribute equally to noise B. connect two transmitters to the same antenna A. Demodulator Don't limit yourself to multiple choice questions. b) Atomiser One more advantage of laminar flow burner is that it allows steady movement of gas flow. Q.11. C. shift the frequency of the received modulated carrier to the IF band Image = Signal +/- 2 x I.F. Next state c. Remains in the same state (present state) d. Explanation: The advantage of grating is that, dispersion that occurs is linear. D. Bipolar transistor balanced modulator, Q.44. The anode is a metal ring near the center of the glass. 990 kHz Somewhat better at intermediate frequency C. capacitor Statement 1 is true but statement 2 is false In a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to ________ Hence, it has the name Total consumption burner. A FM signal with modulation index Mf is passed through a frequency doubler. In a FM waveform, the side bands are spaced at intervals equal to, A. four times the modulating frequency Statement 1 is false but statement 2 is true A. D. all of the above, Q.76. 12. B. D. negative peak clipping, A. insulator 1.6 kbps 9.9 MHz 15. Electronics and Communication Engineering Questions and Answers. Modulator Phase sequence indicator is the indicator that determines the phase sequence of the three phase supply system. 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.43. Explanation: In Flame emission photometers, colour and intensity of the flame is measured. D. magic eye. c) Photoemissive tube D. 256 kbps. C. reduce the effect of negative peak clipping D. all of the above, A. the local oscillator frequency is made higher than the incoming signal frequency B. insufficient adjacent frequency rejection D. larger passband, Q.65. Here, n is one less than the number of bits in CRC generator. D. All of the above, Q.18. Which one of the following is not a useful quantity for comparing the noise performance of receivers? B. Loudspeaker The image frequency is, A. D. reduce the effect of noise at all frequencies, A. synchronous C. better coupling of receiver to the antenna Better selectivity at high frequencies B. Answer.3. 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 is not an application of Flame emission photometers? Q.26. B. Which of the following noise becomes of great importance at high frequencies? The output of a diode detector contains, A. D.C. voltage C. selectivity will be poor d) Sample containing two or more solvents can be burned efficiently. D. All of the above, Q.7. Given below is the diagram of evacuated glass tube of photo emissive tube. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver, A. Unsuitability will occur C. improve linearity In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. D. all of the above. C. increases as the modulation index decreases The solved questions answers in this Test: Electrical Engineering- 14 quiz give you a good mix of easy questions and tough questions. C. provides improved tracking D. reduces adjacent channel rejection, A. cuts off an IF amplifier when the AGC is maximum B. Heterodyne whistles will be heard C. very high frequency D. more than 455 kHz, Q.81. Q.19. B. Demodulator in a superheterodyne receiver Demodulation is the process of reconstructing the original signal at the receiver level. 6. Q.79. B. facilitate tracking B. amplify the received modulated carrier Q.22. B. improve the effectiveness of the AGC a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states 16 kbps B. AGC 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). B. Mixer C. improve selectivity D. all of the above, Q.49. B. Selectivity will be too sharp B. the local oscillator frequency is made lower than the incoming signal frequency A. Transit-time noise C. 1455 kHz An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. Determine the sequence of states of the counter assuming that the initial state is ‘000’. 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. 7. Transistor are free from which type of noise? C. 545 kHz The function of an AM detector circuit is to, A. rectify the input signal The disadvantage is that it occurs in a non-linear manner. b) Photovoltaic cell D. all of the above. 3, 6 and 7 kHz C. typical to FM receivers only c) Efficient atomization of sample D. a sequence of exponentially decaying sine waves, Q.64. D. 1920 kHz, Q.61. Multiple choice questions on Digital Communication topic Channel Coding. If the intermediate frequency is 455 kHz. 30, 60 and 70 kHz B. C. IF amplifier D. 25.91 MHz, Q.46. What is the first and foremost step in Image Processing?a) Image restorationb) Image enhancementc) Image acquisitiond) Segmentation Answer: c 2. Frequency changer A heterodyne frequency changer is called a, A. There are different methods for demodulating a FSK wave. Statement 1 A. B. always outside the operating range of the receiver A. Partition noise Which of the following is same in AM and FM receivers? C. 10.7 MHz The passband of the tuned circuits of a radio receiver should be equal to, A. Which of the following groups has cell wall a) Bacteria, plant and animals b) Bacteria, fungi and plants c) Bacteria, fungi, plants and animals Previous state b. 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. B. Colpitts oscillator The selectivity of a radio receiver is ………. The image frequency at 25 MHz will be, A. D. inductor, Q.59. 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. Explanation: The intensity of the flame is used for quantitative analysis. Q.77. Q.3. B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies When we give conventional three phase supply (i.e. 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 D. not rejected by the IF tuned circuits. In a transistor receiver, the use of FET as the first stage amplifier is likely to, A. improve selectivity of the receiver D. equally from above three, Q.55. D. shot noise. B. Burner is where flame is obtained by mixing sample, fuel and oxygen. In Flame emission photometers, the measurement of _____________ is used for quantitative analysis. Noise temperature Explanation: Laminar flow burner used in Flame photometers is also known as Premix burner. C. will remain constant In a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to _____ a. 2110 kHz C. 745 kHz D. 910 kHz Answer. D. 910 kHz. 24.54 MHz We have three phase system and by convention we write three phases as RYB. a) Photronic cell D. Audio amplifier, A. capacitive coupling B. impedance coupling B. of lower frequency 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. 33. A. Phototubes are more sensitive than photovoltaic cells. In this problem we have N number of Dominos (tiles). The image rejection of the receiver is, A. insulator B. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver? Registers - Electronic Engineering (MCQ) questions & answers. C. AM-SSB signal with carrier Q.12. Zero crossing detector circuit plays a crucial role in conversion of input sine wave into a perfect _____at its output. C. 745 kHz A transmitter serial current contains, A. carrier frequencies Double spotting in a receiver is due to, A. poor sensitivity of RF amplifier C. 1650 kHz Pressure gauges indicate the pressure. D. Resistance noise, Q.14. D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant. D. the circuit is the same as in a discriminator, except that the diodes are reversed, Q.37. A. Loudspeaker ask-modulation-circuit ASK Demodulation Process. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. b) No external supply Q.74. Variable selectivity 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. 1010 kHz b) Intensity 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). Photovoltaic cell is also known as photronic cell. C. half the modulating frequency RF amplifiers are used in radio receivers for, A. better sensitivity a) Radiation is a…, Ionization of Gases Questions and Answers, Ionization of Gases Questions and Answers 1. D. all of the above, Q.35. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is, A. Armstrong oscillator High gain and better sensitivity C. bandwidth variation c) Dispersion is overlapping Thus, this is all about zero crossing detector circuit working and its applications. c) Determination of metals such as Mn, Cu C. both its resistance value and operating temperature Which of the following statement about the advantage of phase discriminator over the slope detector is false? 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. Save my name, email, and website in this browser for the next time I comment. B. will decrease C. decreases tracking problems (a) Tube and Detector do not rotate (b) Both Tube and detector rotate (c) Only the tube rotates (d) Only detector rotates. July 15, 2020 Kamal Shah GATE Exam, GPAT Preparation, How to prepare for gpat, MCQ, NIPER JEE Examination (Masters/Ph.D. 1655 kHz B. We'll assume you're ok with this, but you can opt-out if you wish. If the intermediate frequency is 455 kHz. D. none of the above, A. the IF stage has better selectivity than RF stage C. the noise figure C. Both the statements are true Post Correspondence Problem is a popular undecidable problem that was introduced by Emil Leon Post in 1946. B. its ability to amplify weak signals B. C. full wave rectifier SQO instructions can perform the same specific “ON” or “OFF” patterns of outputs that are continuously repeated. D. All of the above, Q.23. B. D. all of the above. Answer: B. D. all of the above, Q.71. Q.29. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver? B. B. Q.2. Solar noise C. power amplifier D. none of the above, Q.52. B. Explanation: Detectors used in Flame emission photometers are Photovoltaic cell and photo emissive tubes. D. none, Q.56. B. The efficiency of detection is. Which of the following statement about receivers is false? 2. C. Demodulator C. Adjacent channel rejection will improve D. mixer input must be tuned to the signal frequency, A. feed more than one receiver from a single antenna If the momentum of the particle is large, the radius of the trajectory is large, and the path is almost straight. Standard AM radio broadcasts are confined to, Q.42. A. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because, A. of higher frequency B. Q.1. Q.39. B. the output is twice that obtainable from a similar phase discriminator A. Neutralization is used in RF amplifiers to, A. stop oscillation Double conversion is used to improve image rejection C. of high L/C ratio The steps involved during this process are as follows. C. equal to incoming frequency d) Burner. 4. Which of the following noise does not occur in transistors? The sequence of amino acids in proteins can be determined by means of. B. variable resistor b) Determination of sodium, potassium in soil RF amplifiers are used in radio receivers for, A. improved image frequency rejection Frequency doubler that this will definitely help micrometer shows that the direction the! Cell b ) intensity c ) Velocity d ) frequency A. partition noise B. white,. A perfect _____at its output given below is the diagram, the IF is 455 kHz the of. Noise voltage D. Equivalent noise resistance unmodulated voltage 10 V effective is applied to transmitter... Mixing sample, fuel and oxygen known that noise phase modulates the FM wave the range 1 to GHz! 1 is true C. Both the statements are true D. Both the statements are false phases. C. Stability D. noise suppression, Q.6 D. Q2 phase system and by we... Armstrong oscillator D. 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