3d1x5 Volume 1 (Ure)
Volume 1 for 3D1X5 CDCs
- 1.What is the required angle of incidence necessary to get a reflection back to a light source?
- A.
45
- B.
90
- C.
135
- D.
180
- 2.When a pulse of radio frequency energy is transmitted, it travels at
- A.
The speed of light
- B.
The speed of sound
- C.
One-half the speed of light
- D.
One-half the speed of sound
- 3.Approximately how long does it take for radio frequency energy to travel 1 nautical mile to a target and return to the radar?
- A.
3.09 us
- B.
6.18 us
- C.
9.27 us
- D.
12.36 us
- 4.You can identify the maximum detection range of a radar by dividing the time of one radar mile into the
- A.
Transmitter on-time
- B.
Transmitter off-time
- C.
Pulse recurrence time
- D.
Pulse repetition frequency
- 5.What characteristic of frequency does a radar target moving towards the radar exhibit?
- A.
A lower frequency than the original broadcast
- B.
A higher frequency than the original broadcast
- C.
No apparent frequency change than the original broadcast
- D.
Oscillating lower and higher frequency changes in respect to the original broadcast
- 6.Which radar subassembly ensures all circuits connected with the radar operate in a definite timed relationship?
- A.
Synchronizer
- B.
Transmitter
- C.
Modulator
- D.
Duplexer
- 7.What radar subassembly allows the radar system to transmit and receive from the same antenna?
- A.
Synchronizer
- B.
Transmitter
- C.
Modulator
- D.
Duplexer
- 8.An antenna is said to be reciprocal if
- A.
It is nonlinear
- B.
It transmits patterns
- C.
It contains ferrite devices
- D.
Its transmit and receive patterns are identical
- 9.Which feedhorn is used only for receiving?
- A.
Active
- B.
Linear
- C.
Passive
- D.
Circular
- 10.One use for the beam-lobing switch of the multi-feedhorn system is to
- A.
Raise the effective beam coverage by 3
- B.
Dummy load the lower 3 of the transmitted beam
- C.
Route the received signal from the number one feedhorn to a dummy load
- D.
Vary low-level coverage by routing more radio frequency through one feedhorn
- 11.What does the distribution of electromagnetic energy from the antenna over the aperture determine?
- A.
Main lobe gain
- B.
Pattern of the antenna
- C.
Probability of interference
- D.
Susceptibility of the antenna
- 12.The shape of the beam of radar energy and its antenna pattern depend on the radar’s
- A.
Gain
- B.
Location
- C.
Purpose
- D.
Power
- 13.The scanning method used by the radar system refers to the
- A.
Direction of energy into an appropriately shaped beam
- B.
Orientation of the electromagnetic wave as it travels through space
- C.
Motion of the antenna axis (of the beam) as the radar looks for an aircraft
- D.
Efficient launch and reception of electromagnetic energy in the atmosphere or space
- 14.What scan is identified at the electronic countermeasure receiver by its regular intervals between illuminations?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 15.What scan system uses a thin beam to cover a rectangular area by sweeping the area horizontally with the angle of elevation incrementally stepped up or down with each horizontal sweep of the sector?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 16.Which scan radar is also used in the acquisition phase by some airborne intercept radars?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 17.Which scan radar gets its name from the fact that each echo pulse from the aircraft being tracked yields a new azimuth and elevation correction signal?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 18.In which scan radar does the antenna rotate on an azimuth sweep, while the elevation angle rises slowly from 0 to 90?
- A.
Palmer
- B.
Helical
- C.
Palmer/Raster
- D.
Track-While
- 19.What causes delayed, but separate, pulses?
- A.
Simultaneous reception of pulse-type information
- B.
Near-simultaneous reception of pulse-type information
- C.
Electromagnetic (EM) waves reach the receiving antenna by direct paths
- D.
EM waves reach the receiving antenna by indirect paths
- 20.Attempts to reduce multipath effects on radar tracking accuracy include the use of
- A.
Off-axis tracking
- B.
Frequency agility
- C.
Monopulse radar
- D.
Off-boresight tracking
- 21.What type of radar system uses a B-scan indicator?
- A.
Long-range surveillance
- B.
Airport surveillance
- C.
Precision approach
- D.
Weather
- 22.What target information is provided by a plan-position indicator?
- A.
Azimuth only
- B.
Elevation only
- C.
Range and azimuth
- D.
Elevation and range
- 23.In a Raster scan indicator, how many vertical scan periods does it take to produce one complete picture?
- A.
1
- B.
2
- C.
3
- D.
4
- 24.Which indicator component produces signals that determine the overall operation of what the indicator will do?
- A.
Data processing circuits
- B.
Deflection circuits
- C.
Cathode-ray tube
- D.
Video circuits
- 25.In a typical indicator system, where is digital display data from the data processing circuits converted into analog drive signals?
- A.
Deflection circuits
- B.
Cathode-ray tube
- C.
Video circuits
- D.
Power supply
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