RADAR OPERATION - EXERCISE ONE
NAME:________________
1. Changing the range will affect the radar’s:
(a) transmitted frequency and power output
(b) pulse length and PRF
(c) receiver frequency and power output
2. A guide to the correct setting of the sea clutter is:
(a) a heavy speckled area around the centre of the display
(b) a dark area around the centre of the display
(c) sea clutter and small echoes are observed
3. Your ship alters to starboard. On a north-up stabilised display:
(a) the heading marker turns clockwise
(b) echoes turn clockwise on the face of the display
(c) echoes turn anti-clockwise on the face of the display
4. A correctly adjusted true motion display operating in sea stabilised mode indicates, with reference to the target:
(a) the motion relative to your ship
(b) the motion relative to the sea
(c) the motion relative to the ground
5. Targets beyond a rain storm can sometimes be detected by:
(a) applying rain clutter
(b) applying sea clutter
(c) reducing the gain
6. Manual tuning should be checked:
(a) on changing pulse length
(b) on changing range
(c) after a period on stand-by
7. Which of the following is the best method to use when tuning the radar set:
(a) weak echoes are shown at their best strength
(b) extent of sea clutter
(c) maximum number of tuning lights
8. The figure below is that used by the IMO to indicate:
(a) aerial rotating
(b) transmit
(c) aerial not rotating
9. The figure below is that used by the IMO to indicate:
(a) tuning
(b) gain
(c) brilliance
10. The figure below is that used by the IMO to indicate:
(a) radar off
(b) receiving
(c) radar on
11. The figure below is that used by the IMO to indicate:
(a) range
(b) VRM
(c) bearing marker
12. The figure below is that used by the IMO to indicate:
(a) rain clutter maximum
(b) sea clutter maximum
(c) rain clutter minimum
13. The figure below is that used by the IMO to indicate:
(a) scale illumination
(b) brilliance
(c) stand-by
14. The figure below is that used by the IMO to indicate:
(a) gain
(b) brilliance
(c) tuning
15. The figure below is that used by the IMO to indicate:
(a) VRM
(b) pulse length
(c) range
16. The figure below is that used by the IMO to indicate:
(a) VRM
(b) range
(c) transmitting
17. The figure below is that used by the IMO to indicate:
(a) pulse length
(b) short pulse
(c) long pulse
18. The figure below is that used by the IMO to indicate:
(a) true motion
(b) north-up
(c) ships head up
19. The figure below is that used by the IMO to indicate:
(a) radar on
(b) scale illumination
(c) brilliance
20. The figure below is that used by the IMO to indicate:
(a) display brilliance
(b) radar on
(c) gain
21. A guide to the optimum setting of the tuning control could be: “adjust the control and observe”:
(a) the extent of sea clutter
(b) the number of tuning lights
(c) the displayed strength of a small isolated danger
22. Your ship alters to starboard. With a ship’s head-up unstabilised display:
(a) the heading marker rotates in a clockwise direction
(b) land echoes change their position on the display in a clockwise direction
(c) land echoes change their position on the display in an anti-clockwise direction
23. Operation of the sea clutter control affects the display of:
(a) all echoes up to a predetermined range
(b) only sea clutter up to a predetermined range
(c) all echoes
24. To search for weak echoes at long range, the operator should:
(a) select long pulse
(b) select short pulse
(c) return the radar set
25. Rain clutter echoes on the display can be reduced by:
(a) careful adjustment of the rain clutter control only
(b) careful adjustment of the gain control only
(c) careful adjustment of the rain clutter, gain and sea clutter controls
26. The gain control performs the following function:
(a) mixes the received frequency to obtain an intermediate frequency
(b) generates the radar pulse
(c) controls overall amplification of all echoes
27. To search for a small target amongst sea clutter the operator should:
(a) switch to long pulse
(b) adjust the sea clutter control
(c) reduce range and adjust sea clutter control
28. When initially tuning a radar set the controls are adjusted in the following order:
(a) gain, brilliance, tuning, range
(b) tuning, gain, brilliance, range
(c) brilliance, gain, range, tuning
ANSWERS:
1 b
2 c
3 a
4 b
5 a
6 c
7 a
8 a
9 b
10 c
11 c
12 b
13 c
14 c
15 c
16 a
17 b
18 c
19 b
20 a
21 b
22 c
23 a
24 a
25 c
26 c
27 c
28 c