c) Pulse width modulation is used d) Pulse Amplitude modulation is used Ans: Option b) 10. You have to select the right answer to the question. a. Pulsed Wave Radar typically operates at frequencies between 6 and 28 GHz. In spite of its receiving low priority and limited support from the U.S. Navy administration, he successfully demonstrated a radar in 1936 and tested it at sea in 1937. Prev Article Next Article (Last Updated On: March 27, 2020) This is the Multiple Choice Questions in Chapter 16: Radar Systems from the book Electronic Communication Systems by George Kennedy. a. ANSWER: d) All of the above . Two pulse widths are available for transmission. Basic Pulse Radar. View Answer. Pulse Code Modulation - MCQs with answers Q1. 2. The ultimate range accuracy … Narrower pulses improve the radar’s range Radar altimetry measures the two-way travel time of a radar pulse between the satellite antenna and the Earth’s surface at the nadir of the spacecraft. Changing the radar transmitter’s pulse width changes the radar’s sensitivity and range resolution. Kennedy: MCQ in Radar Systems – Answers. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. “http://radar-sales.com/PDFs/Performance_RDR%26TDR.pdf” “Pulse Width And Sensitivity 1. The ATR cell recovery time . P A 38-GHz high-pulse repetition frequency (HPRF) mono-pulse Doppler-radar front-end was developed at the University of Michigan by Caekenberghe et al. Below are the answers key for Multiple Choice Questions in Chapter 16: Radar Systems from the book Electronic Communication Systems by George Kennedy. The minimum range of radar is primarily determined by . Help me go forward with the same spirit. b. Higher pulse repetition frequency (P.R.F.) 10. a) 0 is encoded as positive pulse and 1 is encoded as negative pulse. The OTDR uses a system rather like a radar set. satellite is 24 hrs, Electronics and Communication Engineering Blog, PSU MCQs on Satellite Communication and Radar. With regard to the radar, if the pulse width (PW) is increased (with no change in the PRF), the meteorological target will likewise receive more energy over a given period of time. MCQ in Radar Parameters: PRT, PRF, the Duty Cycle, Average Power ; MCQ in Doppler Effect ; MCQ in Radar Beacons ; MCQ in Range Equations; Start Practice Exam Test Questions Part 1 of the Series. In pulse width modulation, the width of the carrier varies with the amplitude of the modulating signal at the time of sampling. Subject: Digital Communication 3. The range accuracy of a simple pulse radar depends on the width of the pulse: the shorter the pulse, the better the accuracy. All this means that the designer cannot simply increase the pulse width to get greater range without having an impact on other performance factors. Pulse radar emits short and powerful pulses and in the silent period receives the echo signals. In radar system using the intra-pulse modulation of the transmitted pulse, the necessary bandwidth of radar receiver is much higher than the reciprocal of their pulse width. Unfortunately, those changes oppose each other. If PRF of a radar is 1200 and pulse width 1.2 pis, the duty cycle of the output tube is ts/s. You can also take the online quiz from the take Fiber Optics Quiz Button. Pulse Radars can be classified into the following two types based on the type of the target it detects. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. The width of gate pulse can be varies from 0 o to 180 o by controlling the reference signal from 0 to V R. This will control the output voltage of the inverter. Q2. View Answer: Answer: Option A. 1. Why are the pulse width modulated outputs required in most of the applications? c. The overall height of the antenna . These listening times represent one pulsed radar cycle time, normally called the interpulse period or (IPP) or pulse repetition interval (PRI). Part 3: List for questions and answers of Digital Communication . This Fiber Optics MCQ Test contains 20 Multiple Choice Questions. Other articles where Pulse radar is discussed: Robert Morris Page: …he began work on developing pulse radar. In contrast to the continuous wave radar, the transmitter is turned off before the measurement is finished.This method is characterized by radar pulse modulation with very short transmission pulses (typically transmit pulse durations of τ ≈ 0.1 … 1 µs). A.1000 B.1440 C.1201.2 D.1198.8 . 4.5 MHz. 3. If it knows the speed of light and can measure the time taken for the light to travel along the fiber, it is an easy job to calculate the length of the fiber. Home » Communications » Questions and Answers » Kennedy Questions and Answers » answers ». (b) What Is The Minimum Range (in Nautical Miles) That Corresponds To This Pulse Width? To Find the Speed of the Light. Question: (a) What Is The Minimum Width Of A Rectangular Pulse That Can Be Used With An X-band Radar (9375 MHz) If It Is Desired To Achieve A 10 Kt Radial Velocity Accuracy (based On The Doppler Frequency Measured By A Single Pulse), When 2E/No = 23 DB? Discuss in Forum . In this case the necessary bandwidth of radar receiver depends on the internal modulation of the signal, the compressed pulse width and a weighting function, to achieve the required time sidelobe level. Fiber Optic MCQ Test & Online Quiz; Below we have listed the few Fiber Optics MCQ Questions that check your basic knowledge of Fiber Optics. View Answer. 21H. length is usually called Pulse Width in radar systems. 4. d. is equal to the actual cross-sectional area for small targets, 5. b. make the returned echoes easier to distinguish from noise, 8. d. the target will appear closer than it really is, 12. b. the target range, but not position, 15. a. help in subtracting a complete scan from the previous scan, 17. d. More accurate tracking of enemy targets. 41.25 MHz. To begin with, consider an rf pulse of length τ p that consists of segments τ seconds long. Radars measure range based on the time between transmission and reception, and the resolution of … Some special radars can measure to an accuracy of a few centimetres. If you are looking for a reviewer in Communications Engineering this will definitely help. 1. a. Basic Pulse Radar; Moving Target Indication Radar; Let us now discuss the two Radars briefly. Solution: 15. c. 45.75 MHz. (Pulse width is directly related to duty cycle, so if you decide to increase the width of a pulse, you are just altering the duty cycle.) The amplitude modulation M is ratio of reference signal ( V R) and carrier signal ( V C). Make sure to familiarize each and every … It combines the features of pulse radars and continuous-wave radars, which were formerly separate due to the complexity of the electronics. Pulse-Width Modulation (PWM) Mode - MCQs with answers 1. (32) In a radar when the return echo arrives after the allocated pulse interval, then (A) The receiver will get overloaded (B) It may interfere with the operation of the transmitter (C) The target will appear closer than it really is (D) It will not be received View Answer / Hide Answer If the radar is being used for general surveillance on the longer range scales, a long pulse is needed to increase the energy received from more distant targets. Most satellites operate in the frequency range of, 12) For identifying a radar target in a non-lossy medium, the range of the target is to be doubled, the RF power radiated must be increased by, Since the time period of geostationary The Radar, which operates with pulse signal for detecting stationary targets, is called the Basic Pulse Radar or simply, Pulse Radar. Mold Removal Blackwood, 1. Duty cycle is the fraction of time that a system is in an “active” state. 2. c. 4. Increasing the pulse width increases the amount of energy reflected off the target and thereby increases the range at which an object can be detected. But, if the pulse width is decreased, the amount of energy in the pulse is decreased and hence maximum range detection gets reduced. b. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. 11. Here we shall describe this concept by way of an example and discuss its implications for weather radars. It sends out a pulse of light and ‘listens’ for echoes from the fiber. 3H. View Answer: Answer: Option B. As there is no variation in the amplitude of the carrier, the noise may be easily removed at the receiver. By the time the United States entered World War II, there were 79 radars… Equal to c. Greater than d. None of the above. This is precisely what occurs in the WSR-88D. This is the Multiple Choice Questions in Chapter 13: Pulse Communications from the book Electronic Communication Systems by George Kennedy. The width of the vertical sync pulse in the United States TV system is. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Pinoybix.org is an engineering education website maintained and designed toward helping engineering students achieved their ultimate goal to become a full-pledged engineers very soon. ANSWER: (a) Less than The amount of energy that is returned to the radar receiver is a function of the peak energy of the pulse, the pulse width, and the pulse repetition frequency. A radar with a pulse width of one microsecond can measure the range to an accuracy of a few tens of metres or better. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. d. 42.17 MHz. we respect your privacy and take protecting it seriously, Multiple Choice Questions in Electronic Communication Systems, Pinoybix Elex is officially on Google Play | First of …, Complete List of Reviewers to Pass Engineering Board Exam, MCQ in Machine Design and Shop Practice Part 18 | …, MCQ in Machine Design and Shop Practice Part 17 | …, MCQ in Machine Design and Shop Practice Part 16 | …, MCQ in Machine Design and Shop Practice Part 15 | …, MCQ in Machine Design and Shop Practice Part 14 | …. b. The narrower the pulse width the better is the range resolution. Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement. Less than b. a. in a radar will A. increase the range of the radar B. make week signal discernible C. improve the signal-to-noise ratio of the system D. All of the above . In Alternate Mark Inversion (AMI) is. Wider pulses effectively increase the radar’s sensitivity to weak atmospheric events, and increase the radar’s ability to penetrate heavy precipitation. If you are looking for a reviewer in Communications Engineering this will definitely help. ppls tell me from which standard textbook you collected these RADAR questions?its urgent, Wow what a great blog, i really enjoyed reading this, good luck in your work. Range resolution is the ability of the radar to separate closely spaced targets and it is related to the pulse width of the waveform. To increase the SNR without exceeding the peak permissible power and to improve the range resolution for a given pulse width, designers of radars have invented pulse compression. b) 0 is encoded as no pulse and 1 is encoded as negative pulse If the radar pulse width is 1 μs, then there can be no detection of targets closer than about 150 m, because the receiver is blanked. To control average value of an input variables b. a. The frequency of the output voltage depends upon frequency of reference signal. These widths are 1.57 µS and 4.5 µS. A pulse-Doppler radar is a radar system that determines the range to a target using pulse-timing techniques, and uses the Doppler effect of the returned signal to determine the target object's velocity. The product of pulse width (τ) and pulse-repetition frequency (prf) as the reciprocal of the pulse period (Τ) in the above formula is called the duty cycle of radar system. 28, 29 for a long-range automotive radar application such as pre-crash detection and ACC. In addition, unlike the standard machine gun, the '88D can also vary the PRF. The pulse width and the TR cell recovery time . Prev Article Next Article (Last Updated On: February 7, 2020) Below are the answers key for Multiple Choice Questions in Chapter 16: Radar Systems from the book Electronic Communication Systems by George Kennedy. Q1. It does not require synchronization between the transmitter and the receiver. Pulse width modulation is a type of Pulse Time Modulation. c. H. d. 0.5H. This measurement is performed through the recording of the pulse bounced back by the reflecting facets within the altimeter footprint. The modulation techniques used to convert analog signal into digital signal are a) Pulse code modulation b) Delta modulation c) Adaptive delta modulation d) All of the above View Answer / Hide Answer. Short pulses, however, require wide bandwidths in the receiver and transmitter (since bandwidth is equal to the reciprocal of the pulse width). Antenna elevation angle at the ground station for satellite communication is always kept above 5 o to a) minimize the sky noise temperature b) reduce the effect of oxygen and water vapour absorption on the antenna noise temperature c) minimize the slant range 20) For neglecting the pulse dispersion in the digital systems, the rms width of fiber impulse response must be _____one-quarter of the pulse spacing. Indicate which of the following frequencies will not be found in the output of a normal TV receiver tuner: a. Also provides professionals with materials for their lectures and practice exams. Solution: 16. I can assure you that this will be a great help in reviewing the book … To control average value of output variables c. Both a & b d. None of the above View Answer / Hide Answer Kennedy: MCQ in Radar Systems. Pulse Width - The length or duration of an RF pulse “ON” time Duty Cycle – The ratio of the “ON” to “OFF” time of a pulse modulated signal Pulse parameters – In addition to understanding the amplitude aspects, working with pulsed fields requires the user understand the key pulse characteristics of pulse width, pulse repetition frequency or rate, and duty-cycle. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. Work on developing pulse radar is 1200 and pulse width in radar Systems from the book Kennedy. The amplitude modulation is used d ) pulse amplitude modulation is used d ) pulse width of the varies! 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