4
1-29. What component of the transmitter
supplies the trigger pulse, which acts as a
switch to turn the klystron on and off?
1. Magnetron
2. Modulator
3. Indicator
4. Power supply
1-30. Which of the following radar
components allows the use of one
antenna for both transmitting and
receiving radar energy?
1. Synchronizer
2. Modulator
3. Duplexer
4. Mixer
1-31. To make amplification of received rf
energy easier, the returning rf signal is
converted to a lower, intermediate
frequency. What component of the radar
system performs this function?
1. A duo-diode duplexer
2. A three-stage synchronizer
3. A cross-field amplifier
4. A superheterodyne receiver
1-32. The sweep frequency of a radar indicator
is determined by what parameter of the
radar system?
1. Duty cycle
2. Pulse width
3. Carrier frequency
4. Pulse-repetition frequency
1-33. The type and method of scanning used by
a radar system depend upon which of the
following radar system design
considerations?
1. Antenna size
2. Type of radar
3. Purpose of the radar
4. All of the above
1-34. In a single stationary-lobe scanning
system, complete azimuth coverage is
achieved by which of the following
methods?
1. Multiple overlapping beams
2. An omnidirectional antenna
3. A continuously rotating antenna
4. Very wide, flat beams
1-35. Which of the following methods can be
used to achieve radar-beam scanning?
1. Mechanical
2. Electronic
3. Combined mechanical and electronic
4. Each of the above
1-36. In a conical-scan antenna, nutation of the
radar beam is usually accomplished by
which of the following methods?
1. By moving the reflector
2. By moving the feed point
3. By varying the signal phase at the
feed point
4. By moving both the feed point and
the reflector
1-37. At any given distance from the antenna,
the radar beam axis of a conical-scan
antenna follows what pattern?
1. A circle around the scan axis
2. An ellipse in the vertical plane
3. An ellipse in the horizontal plane
4. Two circles covering the scan axis in
figure eights
1-38. In a monopulse scanning radar, the
relative position of a target with respect
to the radar-beam axis is determined by
comparing which of the following signal
components?
1. The phases of the radiated rf energy
2. The phases of the returning rf energy
3. The amplitudes of the returning rf
energy in each horn
4. The amplitudes of the returning rf
energy in each successive pulse
