Radar Question & Answers December 1, 2022 By WatElectronics This article lists 100 Radar MCQs for engineering students. All the Radar Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Radar. A system that is meant for detection by using radio waves to determine the angle, object radial velocities, and its angle and are related to sites is referred to as Radar. These are installed and are used for detecting spacecraft, ships, aircraft, motor vehicles, weather formation, terrain, and guided missiles. Radar systems consist of the transmitter to produce EM waves in microwaves or radio domains, an antenna to transmit, an antenna to receive, and also the receiver. It also consists of a processor that is capable of determining objects' properties. Radio signals generated either continuously or pulsed from the transmitter get reflected from objects and are returned to a receiver. The Signal returned to the receiver contains information about the object's speed and location. Initially, the Radars are developed for military use during the second world war. Later developments in the Radar made it accessible for diverse applications including air, anti-missile system, landmarks located using marine radar, and so on. High-tech systems of radar are associated with the processing of digital signals, machine learning, and extracting information from high-level noise. A different system that is much similar to Radar uses other partitions of the EM spectrum. For example, Lidar uses IR lights from LASER instead waves of radio. Unwanted incidents in vehicles without drivers are prevented because radar assists the platform i.e., automated, and the environment of that particular vehicle is monitored. 1). RADAR is an ________________ sensor? Electro-magnetic Electric Magnetic Static None Hint 2). What are the operations performed using Radars? Detection Tracking Locating All Mentioned Above None Hint 3). Echoes are observed from ____________ in Radars? Targets Antennas Repeaters Systems None Hint 4). How Radar is different from IR & optical devices of sense? Detects Far Objects Targets Range is Determined Targets Distance is Determined All Mentioned Above None Hint 5). _______________ can determine targets shape & size as well? Transmitter Receiver Optical Fibre Radar None Hint 6). Radars are ____________ devices? Active Sensing Passive Sensing Static Sensing Dynamic Sensing None Hint 7). In what region of the EM spectrum, Radars are operated? Infrared Microwave Ultra-violet Visible None Hint 8). Radars are used for _____________ frequencies? Lower Moderate Higher All Mentioned Above None Hint 9). The components in circuit & hardware of radars are varied with ____________? Frequency Used Systems Range Sensors Used a & b None Hint 10). Radars range is dependent on ______________? Transmitters Average Power Antennas Size Receivers Average Power a & b None Hint 11). ___________ is detected because of noise at the input of the receiver? Radars Sensitivity Receiver Noise Transmitter Sensitivity Receiver Sensitivity None Hint 12). What should be placed at the initial receiver’s stage? Voltage Regulator Current Regulator Transistor Amplifier Multiplexer None Hint 13). _____________ in radars enhances signals desired? Transmitter Receiver Source Antenna None Hint 14). RADAR is _________? Radio Detection & Ranging Radio Automation Detection & Ranging Rain Automobile Detection & Randomization Ranging & Diversifying Automobile Randoms None Hint 15). Distance amid target and radar is referred to as _________? Randomization Reallocation Retrieving Ranging None Hint 16). Time intervals between successive pulses of the clock are referred to as __________? Pulse Reallocation Pulse Retrieving Pulse Repetition Time Post Reallocation Time None Hint 17). What frequency determines the signal transmitted by the Radar? Pulse Reallocation Pulse Retrieving Pulse Repetition Frequency Post Reallocation Frequency None Hint 18). Maximum Unambiguous Range is to detect ____________? Targets Antennas Repeaters Systems None Hint 19). What happens if the signal transmitter has lesser power? RADAR Cannot Detect Echo Signals Radar Detects Echo Signal Radar Amplifies Echo Signal Radar Detects Targets None Hint 20). Echo signal containing the minimum value of power, then signals detected using radars are referred to as ___________? Maximum Ambiguous Signal Maximum Unambiguous Signal Minimum Detectable Signal Maximum Detectable Signal None Hint 21). Target is detected from the threshold value of the signal received is known as ____________? Boundary Detection Upward Detection Downward Detection Threshold Detection None Hint 22). What should be the value of the threshold if radar contains high detected signal strength? Low Moderate High None None Hint 23). If the signals point is greater the value of the threshold is referred to as _________? Threshold Detection Valid Detection Missing Detection Searching Detection None Hint 24). If the signals point is lesser the value of the threshold is referred to as _________? Threshold Detection Valid Detection Missing Detection Searching Detection None Hint 25). Unwanted component in the signal received at the Radars receiver is ________? Receiver Noise Transmitter Noise Threshold Noise Noise Power None Hint Radar MCQs for Exams 26). Thermal motion due to electrons conduction in radars leads to ____________? Noise Thermal Noise Transmitter Noise Retrieving Noise None Hint 27). Radar uses ____________ principle? Echo Refraction Diversion Intensification None Hint 28). What waves does radar use? Electric Magnetic Electro-magnetic Infrared None Hint 29). Targets that are not visible to radars at a certain speed are referred to as ____________? Visible Speed Blind Speed Missing Speed Threshold Speed None Hint 30). Based on signals type, Radars are classified as _________________? Pulse Radar Continuous Wave Radar a & b Discontinuous Wave Radar None Hint 31). Pulse signal used to operate the Radar is referred to as __________? Pulse Radar Continuous Wave Radar Symmetric Radar Discontinuous Wave Radar None Hint 32). How many types does a pulse radar have? Four Three Two One None Hint 33). Stationary targets are detectable using ____________? Basic Pulse Radar Continuous Wave Radar Symmetric Radar Discontinuous Wave Radar None Hint 34). Basic pulse radar use ______ antenna? Four Three Two One None Hint 35). For each clock signals antenna in basic pulse radar transmits ___________? Continuous signal Sine wave Pulse signal Asymmetric Signal None Hint 36). What is utilized to detect targets that are non-stationary? Basic Pulse Radar Moving Target Indication Radar Symmetric Radar Discontinuous Wave Radar None Hint 37). What principle is used in MTI Radar? Flemming Effect Doppler Effect Hall Effect Thevenin’s Effect None Hint 38). Continuous wave radars use ______? Continuous signal Sine wave Pulse signal Asymmetric Signal None Hint 39). Continuous wave radars are classified as? Four Three Two One None Hint 40). Which is known as CW Doppler Radar? Basic Pulse Radar Unmodulated CW radar Frequency Modulated CW Radar Frequency Demodulated CW Radar None Hint 41). How many antennas are used in unmodulated CW radars? Four Three Two One None Hint 42). What is measured using unmodulated CW radars? Speed Velocity Distance Density None Hint 43). Which radars use frequency modulation? Basic Pulse Radar Unmodulated CW radar Frequency Modulated CW Radar Frequency Demodulated CW Radar None Hint 44). What is measured using Frequency Modulated CW radars? Speed Velocity Distance a & b None Hint 45). What is the purpose of pulse modulators in pulse Radar? To Produce Pulse Modulated Signal To Produce Continuous Signal To Produce Asymmetric waves To Produce Error Signals None Hint 46). What transmit pulses that are repetitive in pulse radar? Transmitter Pulse Modulator Oscillator Mixer None Hint 47). What connects the antenna to the transmitter in pulse radar? Transmitter Pulse Modulator Duplexer Mixer None Hint 48). _______ amplifies received Rf signals that are weak in the pulse Radar? Transmitter Pulse Modulator Duplexer Low Noise RF Amplifier None Hint 49). What improves SNR at pulse radars output? Transmitter IF Amplifier Duplexer Low Noise RF Amplifier None Hint 50). What demodulates the outcome obtained from If amplifiers in pulse radar? Detector IF Amplifier Duplexer Low Noise RF Amplifier None Hint Radar MCQs for Students 51). What happens if the target is non-stationary in radar? Signal is not Detected Change in Angle of Signals Change in Signals Frequency Does not Affect Frequency None Hint 52). Received signals frequency _____ if the target tends to move in radars direction? Degrades Does not Change Increases None None Hint 53). How many mixers are present in CW radars? Four Three Two One None Hint 54). Analog signals with f0 as frequency in CW radars are produced using _________? CW Transmitter Mixer CW Receiver Detector None Hint 55). What produces the signal with frequency f1 in continuous radar? CW Transmitter Mixer CW Receiver Local Oscillator None Hint 56). What are the output frequencies produced by mixer 1 in CW radars? fo fo+f1 fo-f1 b & c None Hint 57). What are the outcome frequencies obtained from Mixer2? f1±fd fo+f1±fd fo-f1 a or b None Hint 58). Which frequencies are amplified by the If amplifier in CW radar? f1±fd fo±fd fo-f1 a or b None Hint 59). What detects the signals with doppler frequencies? CW Transmitter Mixer CW Receiver Detector None Hint 60). What amplifies the signals containing doppler frequencies? CW Transmitter Mixer Doppler Amplifier Detector None Hint 61). What is the purpose of an indicator in CW radar? Speed is Detected Frequency is Determined Relative Velocity is Indicated a & b None Hint 62). Information of target in CW radars is indicated using _______? Indicator Mixer Doppler Amplifier Detector None Hint 63). Echo signal in FMCW radar is received by _________? Transmitting Antenna Oscillator Receiving Antenna Duplexer None Hint 64). What is the purpose of a local oscillator in FMCW radar? Signal produced with IF Signal have Upper-Frequency Signal have Lower Frequency b & c None Hint 65). What are the frequencies produced by FMCW radars mixer 1? fo fo(t) + f(if) fo(t)- f(if) b or c None Hint 66). What produces a lower frequency of sideband in FMCW radar? Transmitting Antenna Sideband Filter Receiving Antenna Duplexer None Hint 67). What are the frequencies produced by mixer 2? Upper Band Frequencies Lower Band Frequencies Higher Band Frequencies None None Hint 68). What is the signal frequency obtained from FMCW radar? Upper Band Frequencies Intermediate Frequencies Higher Band Frequencies Fluctuates from High to Low None Hint 69). What amplifies the outcome from the balance detector to desired levels in FMCW radar? High-Frequency Amplifier Low-frequency Amplifier Intermediate Frequency Amplifier Local Oscillator None Hint 70). In FMCW radar outcome of low-frequency amplifiers is fed to ________? Switched Frequency Counter Average Frequency Counter Mixer a & b None Hint 71). Doppler velocity in FMCW radars is obtained from __________? Switched Frequency Counter Average Frequency Counter Mixer a & b None Hint 72). Average counter of frequency calculates _____ in FMCW radar? Velocity Speed Frequency Range None Hint 73). MTI radars must receive an echo signal from _____? Stationary Targets Moving Target Local Objects Lands None Hint 74). Echo signals received from Stationary objects are referred to as _________? Signals Waves Clutters Clusters None Hint 75). Based on the types of transmitters MTI radars are classified as ________? MTI Radar with Power Amplifier Transmitter MTI Radar with Power Oscillator Transmitter MTI with Duplexer a & b None Hint Radar MCQs for Interviews 76). MTI radar is based on a power amplifier as the transmitter use ______ antenna? Four Three Two One None Hint 77). Pulse modulated signal from the pulse modulator is injected to __________? Power Amplifier Low-frequency Amplifier Intermediate Frequency Amplifier Local Oscillator None Hint 78). What amplify levels of power in pulse signals? Power Amplifier Low-frequency Amplifier Intermediate Frequency Amplifier Local Oscillator None Hint 79). What type of radars are preferred if velocities of information are a priority? Basic Pulse Radar Continuous Wave Radar Symmetric Radar Discontinuous Wave Radar None Hint 80). Local oscillators outcome is applied to_______ in FMCW Radar? Switched Frequency Counter Mixer 1 Mixer 2 b & c None Hint 81). What produces signals with the intermediate frequencies in FMCW Radar? Indicator Mixer Doppler Amplifier Coherent Oscillator None Hint 82). What is the outcome signals frequency obtained from mixer1 in FMCW Radar? f1 fo(t) + f(if) fo(t)- f(if) f1+fc None Hint 83). Aircraft during rain is detected using _____________ in Radars? Circular Polarization Linear Polarization Elliptical Polarization Asymmetric Polarization None Hint 84). What are the various Radar applications? Air Traffic Control Ship Safety Sensing of Remote Places All Mentioned Above None Hint 85). Blind speed of Radars is dependent on ____________of waves? Frequency Wavelength Pulse Repetition Time All Mentioned Above None Hint 86). What type of radars are capable of eliminating clutters? Basic pulse radar MTI Radar Symmetric Radar Discontinuous Wave Radar None Hint 87). What changes the microwave signals of echo into electrical in radars? Ultrasonic Sensors IR Sensors Radar Sensors Humidity Sensors None Hint 88). Which sensors in radar are used in measuring objects' distance? Ultrasonic Sensors IR Sensors Radar Sensors Humidity Sensors None Hint 89). _______________ are the radar types? Monostatic Multi-static Bistatic All Mentioned Above None Hint 90). What transmits higher repletion frequencies of pulses? Pulsed Radar Pulse Doppler Pulse Generator Pulse Multiplexer None Hint 91). What transmits lower repetition frequencies of pulses? Pulsed Radar Pulse Doppler Pulse Generator MTI Indicator None Hint 92). What is the oscillator present in MTI Radar? Local Oscillator Coherent Oscillator Stable Local Oscillator b & c None Hint 93). Circular or horizontal polarizations are used in _____________ radars? MTI Radars Pulsed Radars Instrumentation Radars Weather Radars None Hint 94). What is the information obtained from Instrumentation Radars? Space Position Time All Mentioned Above None Hint 95). Which radar is categorized similarly to Bistatic Radar? MTI Radars Passive Radars Instrumentation Radars Weather Radars None Hint 96). Conical Scanning Radar is _________? Monopulse Radars Passive Radars Instrumentation Radars Weather Radars None Hint 97). A receiver & transmitter located at the same position in ________ radar? Monostatic Multi-static Bistatic All Mentioned Above None Hint 98). If the Bistatic angle is equivalent to zero then it is __________ radar? Monostatic Multi-static Bistatic All Mentioned Above None Hint 99). Bistatic angle of radar is small then it is ____________ radar? Monostatic Multi-static Bistatic Pseudo Monostatic Radar None Hint 100). Bistatic angle of the system is almost equivalent to 180 then it is _________ radar? Monostatic Forward Scatter Radar Bistatic Pseudo Monostatic Radar None Hint Please fill in the comment box below. Time's up
