6
1-47. Which of the following statements
describes the advantage of using pulse
modulation (pm) rather than continuous-
wave (cw) in a radar system?
1. Pm may be used to detect moving
targets; cw is effective only against
stationary targets
2. Pm may be used to determine relative
velocity much more accurately than
cw
3. Pm does not require frequency
stabilization of the carrier wave; cw
does
4. Pm does not depend on target
motion; cw does
1-48. In Doppler radar, some definite
relationship must exist between the
transmitted frequency and the reference
frequency. For what purpose is this
relationship used?
1. To detect the heterodyning signal
2. To detect the continuous-wave signal
3. To detect the Doppler shift of the
received signal
4. To detect the frequency shift of the
transmitted frequency
1-49. Which of the following JETDS
classifications identifies a shipboard fire
control radar set?
1. AN/SPS-39
2. AN/SPG-55
3. AN/APG-12
4. AN/MRC-20
1-50. For most military applications, which of
the following radar systems is/are used?
1. Track radar only
2. Search radar only
3. Both track and search radars are used
4. Moving-target indicators
1-51. Detection of surface and low-altitude air
targets is the primary purpose of which
of the following types of radar?
1. Surface search
2. Height finding
3. Fire control
4. Air search
1-52. Which of the following are typical
characteristics of surface-search radars?
1. High pulse-repetition rates
2. Narrow pulse widths
3. High frequencies
4. All of the above
1-53. Long-range aircraft detection is provided
by which of the following types of radar?
1. Track
2. Air search
3. Fire control
4. Surface search
1-54. Which of the following are
characteristics of a typical air-search
radar?
1. Low frequency
2. Narrow pulse width
3. High pulse-repetition rate
4. All of the above
1-55. Which of the following types of radar
provides accurate range, bearing, and
altitude of aircraft?
1. Air search
2. Guidance
3. Height-finding
4. Surface search
1-56. Which of the following radars would
most likely be used to direct CAP aircraft
during an intercept?
1. Track radar
2. Fire-control radar
3. Surface-search radar
4. Three-coordinate radar
