2
1-10. Which of the following terms describes
radar returns that exceed the prt of the
radar?
1. Clutter
2. Ambiguous
3. Reciprocal
4. Acquisition
1-11. What type of transmitter power is
measured over a period of time?
1. Peak
2. Return
3. Average
4. Reciprocal
1-12. Which of the following formulas can be
used to compute the duty cycle of a radar
set?
1.
2.
3.
4.
IN ANSWERING QUESTIONS 1-13 AND
1-14, ASSUME THAT A RADAR SET HAS
THE FOLLOWING CHARACTERISTICS:
AVERAGE POWER = 700 WATTS
PULSE WIDTH = 3. 5 MICROSECONDS
PRF = 400 HERTZ
1-13. What is the peak power (in kilowatts) for
this radar set?
1. 500
2.
1,500
3.
2,000
4.
2,500
1-14. What is the pulse-repetition time (in
microseconds) for this radar set?
1.
1,500
2.
2,000
3.
2,500
4.
4,000
1-15. For a radar set with a pulse width of 25
microseconds and a prf of 600 pulses per
second, what is the duty cycle?
1.
0.015
2.
0.024
3.
0.15
4.
0.24
1-16. What is the maximum radar horizon
distance for a radar set with an antenna
100 feet above the surface of the earth?
1. 8 miles
2. 12.5 miles
3. 80 miles
4. 125 miles
1-17. A radar set with a prf of 1,000 pps and an
antenna rotation rate of 15 rpm produces
what maximum number of pulses per
degree?
1. 2.7
2.
11.1
3.
14.4
4.
36
1-18. The relative bearing of a radar echo is
measured with respect to which of the
following reference points?
1. True north
2. Magnetic north
3. Centerline of your own ship
4. The position of the antenna