Navigatie partea 3- 300 intrebari

Super-refraction is likely to cause....

• decreased target detection ranges

• no effect on detection ranges

• increased target detection ranges

• inaccuracies in detection ranges

Super-refraction is normally caused by....

•   cool air over a warm sea surface

• warm air over a cool sea surface

• strong winds

• disturbances in the upper atmosphere

Target echoes appear along a line called the......

• timebase.

• scanner.

• centre line.

• heading marker.

Target echoes are received in the display unit in the form of....

• an increased potential to the grid

• a pulse from the brightening unit to the cathode

• a signal from the scanner to the deflection coil

• a current from the final anode to the screen
  

Target ranges are obtained from......

• the pulse repetition frequency.

• the heading marker.

• the range marker.

• the bearing marker.

The best land target to use for a radar bearing is....

• a sloping foreshore

• a large headland

• a small isolated feature

• a coastal indentation
  

The best land target to use for radar ranging is....

• an edge of land

• a small rock

• a low-lying point

• a cliff face

The bright spot which forms the trace or timebase moves across the radar screen at a speed equivalent to......

• half the speed of the radar waves.

• the speed of the radar waves.

• a continuously variable speed.

• twice the speed of the radar waves.

The brilliance control of a Cathode Ray Tube ( CRT ) operates on....

• the deflection coil

• the cathode

• the anode

• the grid

The brilliance control should be adjusted so that....

• the trace is just barely visible

• the trace is as bright as possible

• weaker echoes are just barely visible

• weaker echoes are as strong as possible