Key Topic 2: Distance and Time

Question 1

8-2A1: A radio wave will travel a distance of three nautical miles in:

A. 6.17 microseconds.
B. 37.0 microseconds.
C. 22.76 microseconds.
D. 18.51 microseconds.

Answer 1

D. 18.51 microseconds.

Question 2

8-2A2: On RADAR mile is how many microseconds?

A. 6.2
B. 528.0
C. 12.34
D. 0.186

Answer 2

C. 12.34

Question 3

8-2A3: RADAR range is measured by the constant:

A. 150 meters per microsecond.
B. 150 yards per microsecond.
C. 300 yards per microsecond.
D. 18.6 miles per microsecond.

Answer 3

A. 150 meters per microsecond.

Question 4

8-2A4: If a target is 5 miles away, how long does it take for the RADAR echo to be received back at the antenna?

A. 51.4 microseconds.
B. 123 microseconds.
C. 30.75 microseconds.
D. 61.7 microseconds.

Answer 4

D. 61.7 microseconds.

Question 5

8-2A5: How long would it take for a RADAR pulse to travel to a target 10 nautical miles away and return to the RADAR receiver?

A. 12.34 microseconds.
B. 1.234 microseconds.
C. 123.4 microseconds.
D. 10 microseconds.

Answer 5

C. 123.4 microseconds.

Question 6

8-2A6: What is the distance in nautical miles to a target if it takes 308.5 microseconds for the RADAR pulse to travel from the RADAR antenna to the target and back?

A. 12.5 nautical miles.
B. 25 nautical miles.
C. 50 nautical miles.
D. 2.5 nautical miles.

Answer 6

B. 25 nautical miles.