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59 Cards in this Set
- Front
- Back
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the acronym RADAR is derived from what words?
1. ranging, detection, and receiving 2. radiation, detection, and radio 3. radio, detection, and ranging 4. radiation, detection, and ranging |
3. radio, detection, and ranging
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radar uses what form of energy to detect the presence of objects?
1. sound waves 2. visible light 3. infrared radiation 4. electromagnetic radiation |
4. electromagnetic radiation
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RF energy travels through air at approximately what speed?
1. 186,000 statute miles per second 2. 162,000 nautical miles per second 3. 300 million meters per second 4. each of the above |
4. each of the above
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what is the time required for two-waqy travel of an RF pulse if the target is 15 miles from the radar unit?
1. 927.0 microseconds 2. 270.8 microseconds 3. 185.4 microseconds 4. 92.7 microseconds |
3. 185.4 microseconds
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an increase in recovery time of a radar set will cause which of the following results?
1. decrease in minimum range and an increase in receiver sensitivity 2. increase in minimum range and decrease in receiver sensitivity 3. decrease in both minimum range and receiver sensitivity 4. increase in both minimum range and receiver sensitivity |
2. increase in minimum range and decrease in receiver sensitivity
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a radar set has a pulsewidth of 3 microseconds. in order for the operator to see two separate blips that are directly on the same line of bearing , what minimum distance must separate the targets?
1. 37.08 yards 2. 55 yards 3. 492 yards 4. 984 yards |
3. 492 yards
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a pulse radar's range resolution is a function of the transmitted pulsewidth, while azimuth resolution is a function of what?
1. antenna beamwidth 2. receiver sensitivity 3. peak transmitteed power 4. peak half-power points |
1. antenna beamwidth
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in order for two targets at the same range to appear as two targets instead of one target on the radar's indicator, what minimum distance must separate the two targets?
1. 164 yards 2. 620 yards 3. one beamwidth 4. one-half of the pulsewidth |
3. one beamwidth
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which of the following statements is correct concerning the slant range as used to indicate a target's distance from an observing radar?
1. altitude difference is included in the slant range and is the same as horizontal range 2. the straight-line distance is the ratio of slant range to altitude 3. horizontal range is always greater than the slant range measurement 4. altitude difference must be considered if horzontal range is to be computed |
1. altitude difference is included in the slant range and is the same as horizontal range
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the maximum power of a RF transmitted pulse is referred to by what term?
1. duty cycle 2. average power 3. beamwidth 4. peak power |
4. peak power
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although high-frequency energy from a transmitter travels essentially in a straight line and a constant speed, refraction and speed change are known to occur. which of the following atmospheric conditions cause this to happen?
1. temperature only 2. pressure only 3. vapor content only 4. temperature, pressure, and vapor content |
4. temperature, pressure, and vapor content
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which of the following conditions is formed by a temperature inversion and/or by a moisture lapse that may extend or reduce the range of radar?
1. ionization 2. ducting 3. fraction-of-index 4. surface wave |
2. ducting
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the elapsed time between the start of one transmitted pulse and the start of the next is known as which of the following terms?
1. PRT 2. PRF 3. 1/PRF |
1. PRT
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in addition to certain power considerations, the output pulse of a radar transmitter should possess which of the following characteristic shapes in order to present nearby targets on an indicator?
1. narrow with a sloping trailing edge 2. narrow and square 3. wide and square 4. wide with slow rise in the leading edge |
1. narrow with a sloping trailing edge
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generally, the maximum range of pulse type radar is determined by what element?
1. modulation intensity 2. wavelength of transmitted energy 3. pulse repetition frequency 4. antenna radiation pattern |
3. pulse repetition frequency
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the PRF of a radar must be low enough to eliminate ambiguous targets, but high enough that the antenna's speed of rotation does not interfere with what factor?
1. target reception 2. transmitter power 3. the transmitted frequency 4. range notch circuitry |
3. the transmitted frequency
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a radar set with a PRF of 2,000 PPS and an antenna rotation of 20 RPM produces what maximum number of pulses per degree?
1. 2.7 2. 11.1 3. 14.4 4. 16.6 |
4. 16.6
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which of the following statements is correct concerning peak power and average power of a pulsed radar system?
1. average power expended is always greater than peak power 2. average power should approximate peak power to obtain maximum range 3. peak power is expended during the transmission of a pulse, and average power is the power expended over the pulse repetition time 4. average power is the power expended during the transmission of the pulse, and peak power is the power expended over the pulse repetition time |
3. peak power is expended during the transmission of a pulse, and average power is the power expended over the pulse repetition time
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wich of the following formulas expresses the duty cycle of a radar set?
1. PRF/PW 2. PW x PRF 3. peak power x PW/PRT 4. peak power average power |
2. PW x PRF
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which of the following methods of transmitting RF energy uses the doppler principle for radar detection?
1. pulse modulation 2. continuous-wave 3. phase modulation 4. frequency modulation |
2. continuous-wave
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continuous-wave radar, which employs the doppler effect, is best suited in detecting which of the following targets?
1. stationary or slow moving targets 2. fast moving targets 3. targets with a high degree of bearing resolution 4. targets with a high degree of range resolution |
2. fast moving targets
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which of the following components of a radar system determines the timing for all components of the radar?
1. automatic tracker 2. synchronizer 3. reveiver 4. transmitter |
2. synchronizer
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what is the purpose of the modulator in a typical pulse radar system?
1. to establish to pulse repetition period 2. to establish the number of times the transmitter will fire per second 3. to supply high voltage, rectangular pulses to drive the transmitter 4. to supply high voltage, rectangular pulses to drive the sunchronizer |
3. to supply high voltage, rectangular pulses to drive the transmitter
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what modulator circuitry determines the voltage level and width of the pulse generated?
1. the transforming network 2. the RC differentiator 3. the range mark generator 4. the pulse forming network |
4. the pulse forming network
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which of the following tubes should be used as the power amplifier in a radar transmitter?
1. magnetron 2. klystron 3. tetrode 4. cathode-ray |
2. klystron
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the process whereby some electrons are acclerated, some are decelerated, and other are unaffected in the movement of the electron beam towards the collector end of a klystron is referred to by what term?
1. ionic agitation 2. bunching 3. hererodyning 4. beam oscillation |
2. bunching
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what is the primary function of radar duplexing system?
1. to prevent the formation of standing waves in the waveguide system 2. to increase the effective range of the radar 3. to increase the antenna directivity 4. to permit the use of one antenna for transmission and reception |
4. to permit the use of one antenna for transmission and reception
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a defective duplexer will likely cause damage to which of the following radar components?
1. the waveguide 2. the magnetron 3. the receiver 4. the power amplifier tube |
3 the receiver
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because of the difficulty in amplifying high-frequency signals received in most radar receivers, it is necessary to generate an intermediate-frequency signal by a process referred to by which of the following terms?
1. heterodyning 2. demodulation 3. spin modulation 4. discrimination |
1. heterodyning
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the intermediate frequency is produced in what stage of a microwave receiver?
1. signal mixer 2. local oscillator 3. IF amplifer/detector 4. AFC discriminator |
1. signal mixer
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what section of a radar receiver usually determines the overall bandwidth?
1. signal mixer 2. local oscillator 3. IF amplifier/detector 4. AFC discriminator |
3. IF amplifier/detector
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the IF amplifier stages of a radar receiver determines which of the following receiver characteristics?
1. the gain 2. signal-to-noise ratio 3. converts IF pulses to video pulses 4. all of the above |
4. all of the above
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which of the following radar displays provides a map-like presentation that is practically an exact replica of the region scanned by the radar antenna?
1. RHI 2. PPI 3. A-scope 4. B-scope |
2. PPI
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on a RHI display, what is represented by the vertical axis?
1. range only 2. azimuth only 2. elevation 4. range and azimuth |
3. elevation
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on an A-scope presentation, what is displayed on the horizontal axis?
1. range only 2. azimuth only 3. range and azimuth 4. elevation |
1. range only
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which ocomponent provides a crystal-controlled clock and digital timing loop to generate PRF trigger, sweep triggers, range markers, and precision range line signal?
1. PPD 2. RSG 3. PHD 4. RCP |
2. RSG
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th radar set control C-10535/APS-130 (RCP) is located at which of the following stations?
1. ECMO 1 2. ECMO 2 3. pilot 4. co-pilot |
1. ECMO 1
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what are the four ranges on the PPI RNG ratary switch on the RCP?
1. OFF, 15, 60, 120 2. 15, 30, 75, 150 3. 10, 25, 50, 250 4. 25, 50, 75, 100 |
2. 15, 30, 75, 150
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how many slew controls are there with the ApS-130 radar system?
1. 5 2. 3 3. 2 4. 4 |
3. 2
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the azimuth elevation range indicator IP-1060A/APQ-148 is located at what station?
1. ECMO 1 2. pilot 3. co-pilot 4. TACCO 1 |
1. ECMO 1
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in a typical IFF system, what component is referred to as the challenging unit?
1. the radar system 2. the synchronizer 3. the transponder 4. the interrogator |
4. the interrogator
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in a typical IFF system, what component is referred to as the responding unit?
1. mode 2 2. mode C 3. mode 3/A 4. mode 4 |
2. mode C
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which of the following modes of IFF operation is the military encrypted code?
1. mode 1 2. mode 2 3. mode 3/A 4. mode 4 |
4. mode 4
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what is the transmission frequency of the interrogator?
1. 1030 MHz 2. 1060 MHz 3. 1090 MHz 4. 1120 MHz |
1. 1030 MHz
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which of the following modes are used strictly by the military as tactical mods for mission and identification purposes?
1. 1 and 2 2. 2. and 3/A 3. 3/A and 4 4. C and 4 |
1. 1 and 2
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what is the transmission frequency of the transponder?
1. 1030 MHz 2. 1060 MHz 3. 1090 MHz 4. 1120 MHz |
3. 1090 MHz
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a standard SIF reply is bound by a total of how many framing pulse(s)?
1. one 2. two 3. three 4. four |
2. two
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in a typical IFF system, what total number of combinations of codes can be selected in mode C?
1. 4 2. 32 3. 2048 4. 4096 |
3. 2048
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in a typical IFF system, what total number of combinations of codes can be selected in mode 1?
1. 4 2. 32 3. 2048 4. 4096 |
2. 32
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what is the total number of possible codes available in mode C IFF?
1. 2048 2. 2465 3. 4096 4. 4930 |
1. 2048
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which of the following IFF codes are set prior to flight by maintenance control?
1. 1 and 3/A 2. 2 and 3/A 3. 2 and 4 4. 1 and 4 |
3. 2 and 4
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mode 4 codes are loaded into the transponder computer by which of the following means?
1. electronically 2. mechanically 3. physically 4. hydraulically |
1. electronically
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the emergency fuction affects which of the following IFF modes?
1. 4 only 2. 2 and 4 only 3. 1, 2, and 3/A 4. 1, 3/A, and C |
3. 1, 2, and 3/A
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the I/P function is used for which of the following purposes?
1. emergencies 2. aircraft using identical coding 3. drones 4. altitude information above 45,000 feet |
2. aircraft using identical coding
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the X-pulse special reply function is used for which of the following purposes?
1. emergencies 2. helicopters 3. timing 4. unmanned or experimental aircraft |
4. unmanned or experimental aircraft
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the interrogator set works in conjunction with which of the following systems?
1. inertial 2. Loran 3. global positioning 4. radar |
4. radar
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the AN/APX-100 system contains what number of antennas?
1. one 2. two 3. three 4. four |
2. two
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what number of major configurations exist for the AN/APX-100 system?
1. one 2. two 3. three 4. four |
2. two
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what electronic circuit compares both videos in the AN/APX-100 system to determine the stronger signal?
1. coder assembly 2. digital converter 3. diversity processor 4. antenna coupler |
3. diversity processor
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