3
1-19. Altitude- or height-finding radar systems
require a beam with which of the
following characteristics?
1. Narrow in the vertical plane
2. Narrow in the horizontal plane
3. Broad in the horizontal plane
4. Broad in the vertical plane
1-20. Target resolution is the ability of a radar
to distinguish between targets that are at
nearly the same range and/or bearing.
Range resolution is dependent on which
of the following factors?
1. Peak power and beam width
2. Pulse width and beam width
3. Pulse width and target size
4. Peak power and target size
1-21. What is the approximate range resolution
(in yards) of a radar set with a pulse
width of 15 microseconds and a peak
power of 2 kilowatts?
1. 10
2. 24
3.
1,093
4.
2,460
1-22. The width of a radar beam and range to a
detected object are the determining
factors in which of the following radar
system characteristics?
1. Range resolution
2. Bearing resolution
3. Beam half-power points
4. Altitude detection accuracy
1-23. Which of the following factors has/have
the greatest effect on the accuracy of a
pulse radar?
1. Resolution
2. Average power
3. Atmospheric conditions
4. Each of the above
1-24. To detect nearby objects, the output pulse
of a radar transmitter should possess
which of the following characteristic
shapes?
1. Narrow and square
2. Narrow with a sloping trailing edge
3. Wide and trapezoidal
4. Wide and square
1-25. Refractions and speed changes are
known to occur in electromagnetic
wavefronts. These phenomena are
caused by which of the following
conditions?
1. Temperature
2. Vapor content
3. Atmospheric pressure
4. All of the above
1-26. Temperature inversions and/or moisture
lapses in the atmosphere may extend or
reduce the range of a radar by creating
1. ducts
2. ionic layers
3. surface waves
4. reflective layers
1-27. In a pulse radar system, which of the
following components should you expect
to find?
1. Synchronizer and transmitter
2. Duplexer and antenna system
3. Receiver and indicator
4. All of the above
1-28. In a pulse radar system, what component
controls timing throughout the system?
1. Power supply
2. Synchronizer
3. Indicator
4. Receiver
