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