RADAR FALSE ECHO - EXERCISES THREE .........................NAME:_____________________

1. Bearing discrimination can be improved somewhat by:

(a) selecting short pulse

(b) selecting long pulse

(c) reducing the gain


2. Range discrimination can be improved by:

(a) selecting short pulse

(b) selecting long pulse

(c) reducing the gain


3. Range discrimination is the ability to display separately two targets:

(a) at the same range on slightly different bearings

(b) on slightly different ranges and bearings

(c) on the same bearing a slightly different ranges


4. Range discrimination depends mainly on:

(a) pulse length

(b) scanner height

(c) horizontal beam width


5. Bearing discrimination is the ability to display separately:

(a) two targets at the same range but on slightly different bearings

(b) two targets on the same bearing at slightly different ranges

(c) two targets on the same bearing at the same range


6. Beam width distortion occurs because:

(a) the radar beam is a finite width

(b) reflection of the radar beam

(c) refraction of the radar beam


7. Beam width distortion can be improved by:

(a) retuning

(b) reducing the gain

(c) reducing the pulse length


8. If your vessel suffers from shadow sectors you should:

(a) consult the operators manual

(b) determine and record their limits

(c) warn approaching vessels in fog


9. When side echoes are displayed the true target will appear:

(a) at the centre of the pattern

(b) further than the false echoes

(c) closer than the false echoes


10. Second trace echoes are most likely to appear when:

(a) super-refraction conditions are present

(b) a second radar is operating

(c) another large vessel is nearby


11. Echoes caused by side beams can be reduced by:

(a) decreasing brilliance

(b) increasing brilliance

(c) decreasing gain


12. Multiple echoes on the display can be reduced by:

(a) adjusting the tune

(b) decreasing gain

(c) decreasing brilliance on raster scan radars


13. If an echo appears in a shadow sector on the display, you could check to see if it is a real echo by:

(a) plotting

(b) changing the range scale

(c) altering course


14. An echo that appears in a blind sector is:

(a) a second trace echo

(b) an indirect echo

(c) a multiple echo



1 c

2 a

3 c

4 a

5 a

6 a

7 b

8 b

9 a

10 a

11 c

12 b

13 c

14 b