2A251 Volume 5 UREs
- 1.If a radar echo returnes after 310 microseconds, how far away is the target?
- A.
10 miles
- B.
25 miles
- C.
50 miles
- D.
75 miles
- 2.In which radar system does the transmitter produce a signal that regularly changes over a known range of frequencies?
- A.
Beacon
- B.
Frequency-shift
- C.
Pulse-modulation
- D.
Frequency-modulation
- 3.In a pulse-modulation radar system, the transmitter does not interfere with the receiver. This is possible because the transmitter
- A.
Is turned off after each pulse.
- B.
Shifts the frequency of the pulse
- C.
Transmits on a different frequency
- D.
Uses a different antenna than the receiver
- 4.Which radar system is based on the Doppler principle?
- A.
Beacon
- B.
Frequency-shift
- C.
Pulse-modulation
- D.
Frequency-modulation
- 5.In a pulse-modulation radar system, a high pulse repetition frequency radar limits range by
- A.
Using less power
- B.
Using more power
- C.
Shortening listening time
- D.
Lengthening listening time
- 6.Which component in a pulse-modulation radar set supplies the voltages that operate the other radar components?
- A.
Antenna
- B.
Indicator
- C.
Transmitter
- D.
Power Supply
- 7.Which component in a pulse-modulation radar system controls the operation of the entire radar set?
- A.
Antenna
- B.
Indicator
- C.
Transmitter
- D.
Synchronizer
- 8.Where does the radar transmitter in a pulse-modulation radar system send a small amount of energy for use as a time reference?
- A.
Antenna
- B.
Receiver
- C.
Indicator
- D.
Power Supply
- 9.The minimum range of a pulse-modulation radar system is determined by the pulse
- A.
Shape
- B.
Duration
- C.
Recurrence time
- D.
Repetition frequency
- 10.As the pulse duration of a radar system increases, what will happen to the systems minimum and maximum range?
- A.
Minimum range will increase, maximum range will increase
- B.
Minimum range will increase, maximum range will decrease
- C.
Minimum range will decrease, maximum range will decrease
- D.
Minimum range will decrease, maximum range will increase
- 11.The maximum range of a pulse-modulation radar system primarily depends on
- A.
Pulse shape
- B.
Power output
- C.
Pulse recurrence time
- D.
Pulse repitition frequency
- 12.In a frequency-shift radar system, the Doppler principle makes it possible to instantaneously sense and measure
- A.
Altitude and ground track
- B.
Target elevation and speed
- C.
Groundspeed and drift angle
- D.
Magnetic heading and altitude
- 13.In a frequency-shift radar system, what is the relationship between a transmitter/receiver(T/R) and an aircraft when the received frequency is lower that the transmitted frequency?
- A.
They are a constant distance away from each other
- B.
The aircraft is not reflecting any of the radar pulses
- C.
The aircraft is flying toward the T/R
- D.
The aircraft is flying away from the T/R
- 14.If the operating frequency is 100m megahertz (MHZ) with a wavelength of 3 meters, then the frequency determining wall of the waveguide would be
- A.
.9 meters
- B.
1.5 meters
- C.
2.1 meters
- D.
2.7 meters
- 15.The function of a dummy load in search and weather radar is to
- A.
Simulate a capacitive load
- B.
Simulate a resistive load
- C.
Prevent standing waves
- D.
Simulate targets
- 16.What component is used to couple radio frequency energy between the waveguide and test equipment
- A.
Feedhorn
- B.
Duplexer
- C.
Dummy Load
- D.
Directional Coupler
- 17.What is triggered when the AS-653C Radar Antenna Reflector rotates through the aircraft lubber line?
- A.
Bearing Circuit
- B.
Tilt control circuit
- C.
Stabilization circuit
- D.
Heading marker circuit
- 18.Which component in the AN/APN-59 Radar System furnishes both pitch and roll drive signals to the antenna stabilization motors?
- A.
AS-653C
- B.
RT-289G
- C.
AM-853B
- D.
CN-221A
- 19.What component in the AN/APN-59 Radar System provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft altitude?
- A.
CN-221A
- B.
RT-289G
- C.
AM-853B
- D.
C-1242A
- 20.What is the maximum height that the combined altitude radar altimeter subsystem computes aircraft altitude above ground level?
- A.
5,000 feet
- B.
25,000 feet
- C.
35,000 feet
- D.
50,000 feet
- 21.When power is applied to the combined altitude radar altimeter, what is shown on the digital display?
- A.
All eights
- B.
All dashes
- C.
The word INIT
- D.
The word TEST
- 22.What is/are the function(s) of the SET knob located on the combined altitude radar altimeter indicator?
- A.
Used as an on/off control
- B.
Used as an on/off control and to set the VALI indicator
- C.
Used as an on/off control and as a test button to check the system
- D.
Used as an on/off control, to set the VALI indicator, and as a test button to check the system
- 23.What is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display?
- A.
5,000 feet
- B.
10,000 feet
- C.
25,000 feet
- D.
50,000 feet
- 24.Which radar application is used to produce a pictorial map of the terrain?
- A.
Ground mapping
- B.
Terrain following
- C.
Terrain avoidance
- D.
Synthetic aperture radar
- 25.Which radar application is used primarily as an aid to navigation
- A.
Search radar
- B.
Ground mapping
- C.
Terrain following
- D.
Terrain avoidance
Questions: 98 | Attempts: 252 | Last updated: Mar 22, 2022
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