3d1x5 Volume 1 (Ure)

89 Questions | By Huroku | Updated: Mar 21, 2022 | Attempts: 277

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Volume 1 for 3D1X5 CDCs

Questions and Answers

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