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137 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 energy |
4. Electromagnetic energy
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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-way travel of
an RF pulse if the target is 15 miles from the radar unit? 1. 927.0 μs 2. 270.8 μs 3. 185.4 μs 4. 92.7 μs |
3. 185.4 μs
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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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or 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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Apulse 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 transmitted 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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Refer to figure 1-1. 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 horizontal 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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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 energy |
4. Electromagnetic energy
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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-way travel of
an RF pulse if the target is 15 miles from the radar unit? 1. 927.0 μs 2. 270.8 μs 3. 185.4 μs 4. 92.7 μs |
3. 185.4 μs
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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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or 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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Apulse 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 transmitted 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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Refer to figure 1-1. 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 horizontal 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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Radar performance is affected by which of the
following factors? 1. Prevailing atmospheric conditions 2. The quality of maintenance performed on the equipment 3. The operator’s knowledge of the equipment’s capability 4. Each of the above |
4. Each of the above
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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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Which 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 x Average Power |
2. PW x PRF
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Ppk = 500 kW, PW= 3.5 μs, and duty cycle = 0.0014.
What is the PRT of this radar set? 1. 1,000 μs 2. 1,250 μs 3. 2,500 μs 4. 4,000 μs |
3. 2,500 μs
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Ppk = 500 kW, PW= 3.5 μs, and duty cycle = 0.0014.
What is the Pavg of this radar set? 1. 207 W 2. 358 W 3. 600 W 4. 700 W |
4. 700 W
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Ppk = 500 kW, PW= 3.5 μs, and duty cycle = 0.0014.
What is the PRF of this radar set? 1. 200 PPS 2. 300 PPS 3. 400 PPS 4. 490 PPS |
3. 400 PPS
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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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Frequency-modulated radars transmit a wave
that is continuously varying from a fixed reference frequency. When frequency modulation is used, how is the target detected? 1. Comparing the frequency of the signal that is presently being transmitted with the received frequency that has been reflected from the target 2. Comparing the magnitude of the pulses that have been transmitted at one frequency with the magnitude of the reflected pulses at a second frequency 3. Measuring the velocity of the received energy and comparing it with the velocity of the energy being transmitted 4. Measuring the Doppler shift that has occurred in the returning signal |
1. Comparing the frequency of the signal that is presently being transmitted with the
received frequency that has been reflected from the target |
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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. Receiver 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 synchronizer |
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
accelerated, some are decelerated, and others 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. Heterodyning 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 amplifier/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 3. 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 component provides a crystalcontrolled
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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The 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
rotary 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. The radar system 2. The synchronizer 3. The transponder 4. The interrogator |
3. The transponder
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What IFF mode of operation is used to report
altitude information? 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 mode? 1. Mode 1 2. Mode C 3. Mode 3/A 4. Mode 4 |
4. Mode 4
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What it 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 modes 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 pulse spacing of Mode 3/A?
1. 2.9 to 3.1 μs 2. 4.8 to 5.2 μs 3. 7.8 to 8.2 μs 4. 20.8 to 21.2 μs |
3. 7.8 to 8.2 μs
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What is the pulse spacing of Mode 2?
1. 2.9 to 3.1 μs 2. 4.8 to 5.2 μs 3. 7.8 to 8.2 μs 4. 20.8 to 21.2 μs |
2. 4.8 to 5.2 μs
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What is the pulse spacing of Mode 1?
1. 2.9 to 3.1 μs 2. 4.8 to 5.2 μs 3. 7.8 to 8.2 μs 4. 20.8 to 21.2 μs |
1. 2.9 to 3.1 μs
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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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Astandard 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 personnel? 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 function affects which of the
following IFF mode(s)? 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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When is the SPI pulse present in the reply pulse
train in Mode C? 1. When a D4 pulse is present 2. When a D4 pulse is not present 3. When a F2 pulse is present 4. When a F2 pulse is not present |
1. When a D4 pulse is present
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Which of the following components of the
APX-72 system contains controls for selection of Modes 1 and 3/A? 1. TS-1843/APX 2. RT-859/APX-72 3. C-6280/APX-72 4. KIT-1/TSEC |
3. C-6280/APX-72
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Which of the following APX-72 system
components provides for ground or in-flight transponder testing capability? 1. TS-1843/APX 2. RT-859/APX-72 3. C-6280/APX-72 4. KIT-1/TSEC |
1. TS-1843/APX
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Which of the following components of the
APX-72 system allow the transponder to respond to Mode 4 interrogations? 1. TS-1843/APX 2. RT-859/APX-72 3. C-6280/APX-72 4. KIT-1/TSEC |
4. KIT-1/TSEC
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What component of the interrogator set
determines the delay between the challenge pulse and receipt of the coded replies for determining target range? 1. Receiver/Transmitter RT-868/APX-76(V) 2. Switch Amplifier SA-1568/APX-76(V) 3. Electronic Synchronizer SN-416/APX-76(V) 4. Interrogator Computer KIR-1/TSEC |
1. Receiver/Transmitter RT-868/APX-76(V)
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What component of the interrogator set contains
performance monitoring circuits that perform self-tests during each challenging period? 1. Receiver/Transmitter RT-868/APX-76(V) 2. Switch Amplifier SA-1568/APX-76(V) 3. Electronic Synchronizer SN-416/APX-76(V) 4. Interrogator Computer KIR-1/TSEC |
2. Switch Amplifier SA-1568/APX-76(V)
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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 antenna(s)? 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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What does the acronym radar mean?
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Radio Detection and Ranging.
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What is the speed of electromagnetic energy
when it travels through air? |
Approximately the speed of light or 186,000 statute miles per second.
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What is the minimum range for a radar
system with a pulsewidth of 10.5 s, which has a recovery time of 0.5 s? |
1,804 yards.
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What is the range of target when the elapsed
time for the radar pulse to travel to the target and return is 370.8 microseconds? |
30 nautical miles.
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What factors determine the minimum range of
a pulse radar system? |
The pulsewidth of the transmitted pulse and the recovery time of the duplexer and
the receiver. |
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The maximum range of a pulse radar system
depends upon what three factors? |
Transmitted power, pulse repetition frequency (PRF), and receiver sensitivity.
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Define range resolution of a radar system.
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Range resolution of a radar system is the minimum resolvable separation in
range of two targets at the same bearing. |
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What effect is achieved by increasing the
length of a pulsewidth? |
The longer the pulsewidth, the greater the range capabilities of the radar.
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What term is used to describe the situation in
which atmospheric temperature first increases with altitude and then begins to decrease? |
Temperature inversion.
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The bending of radar waves due to a change
in density of the medium through which they are passing is known by what term? |
Refraction.
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A very high radar antenna indicates what
type of frequency? |
A low carrier frequency.
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Radar frequency ranges are divided into
sections referred to by what term? |
Bands.
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The ideal radar pulse shape should have what
characteristics? |
A square wave with very sharp leading and trailing edges.
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What part of a radar pulse affects its range
accuracy? |
The leading edge.
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What is the reciprocal of PRF?
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PRT.
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What two RF generating devices have low
interelectrode capacitance, low transit time, and the ability to handle very high levels of RF power? |
Magnetron and klystron.
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What is the duty cycle of a radar system that
has an average power of 2 Megawatts and a peak power of 200 Megawatts? |
0.01.
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What radar transmission method does not
depend on target motion or relative frequency of the returned signal? |
Pulse modulation radar.
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What is the purpose of radar synchronizer?
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Provides proper timing pulses to components of the radar system.
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What are the two synchronization
classifications for a basic pulse radar system? |
Self-synchronized or externally synchronized.
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What are the two high-powered RF
generators used in transmitters of pulse radar systems? |
Magnetron and klystron.
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Adding additional intermediate cavities
between the input and output of a klystron has what affect on power output? |
An increase in the power available at the output.
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What is a duplexer and what is its purpose in
a radar system? |
An electronic switch that permits the use of one antenna for both transmit and
receive functions. |
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What type of receiver mixes incoming signals
with the receiver’s local oscillator signal to produce an intermediate frequency? |
Superheterodyne.
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What is the purpose of the AFC circuitry
within the receiver? |
To maintain a constant IF frequency out of signal mixer.
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What function does the detector perform
within the receiver? |
Converts IF pulses into video pulses, which are applied to radar indicators.
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What are the three types of radar indicators?
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PPI, RHI, and A-scope.
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The PPI provides what type of presentation?
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A map-like presentation of the region scanned.
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What are the nine major components that
make up a typical pulse radar system? |
Antenna, antenna servo system, duplexer, transmitter, receiver, modulator, power
supplies, synchronizer, and indicators. |
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What are the four positions on the SCAN SPD
rotary switch on the C-10535/APS-130 Radar Set Control? |
OFF, 25, 50, 100.
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What are the four functional groups of the
T-1396/APS-130 Transmitter? |
Power supply group, modulator group, transmitter group, and BIT group.
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What position is the DVRI located in?
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ECMO 1.
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The CV-2434 Analog-Digital Converter is a
major component of what radar system? |
The APS-130.
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During update mode, what slew control has
priority for all inputs? |
ECMO 1.
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What does the acronym IFF stands for?
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Identification Friend or Foe.
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What are the three basic steps in the identification
process of a typical IFF system? |
Challenge, decode, and reply.
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True or False. All naval aircraft contain an
interrogator system. |
False.
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What is the pulse spacing of Mode 1?
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2.9 to 3.1 s.
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Of the six modes of IFF operation, which one
is used by military and civilian aircraft control stations? |
Mode 3/A.
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What mode IFF is the military encrypted
mode? |
Mode 4.
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What is the transmission frequency of the
interrogator? |
1030 MHz.
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In a typical IFF/SIF system, what total
number of codes can be selected in Mode 2? |
4,096.
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The Identification of Position (I/P) pulse is
used for what purpose? |
It is used to identify a specific friendly aircraft among other friendly aircraft that
reply with the same code |
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What mode of IFF is set prior to takeoff by
maintenance personnel? |
Mode 2.
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Where are Modes 1 and 3/A selected on the
AN/APX-72 transponder set? |
By thumbwheel switches on the front of the control box.
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What part of the APX-72 system provides for
ground or in-flight transponder testing capability? |
The Transponder Test Set TS-1843/APX.
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The AN/APX-72 generates a signal of what
frequency when interrogated? |
1090 MHz.
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The interrogator works in conjunction with
what other aircraft system? |
The radar.
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What component of the interrogator set is
used to select SIF reply codes for Modes 1, 2, and 3/A? |
C-7383/APX-76(V) control box.
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What component monitors the timing
triggers, pre-triggers, gates, and test video and causes the fault indicator lamp on the interrogator control to illuminate when a fault has been detected within the system? |
Electronic Synchronizer SN-416/APX-76(V).
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The APX-100 transponder set is available in
what number of configurations? |
The system comes in two configurations.
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To respond to Mode 4 interrogations, the IFF
transponder set system requires what additional components? |
Transponder Computer KIT-1/TSEC.
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What APX-100 system is referred to as the
rack-mounted configuration? |
Receiver/Transmitter RT-1157/APX-100.
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