Vayudoot Aviation

1. Airborne Weather Radar is an example of radar operating on a frequency of in the band

primary 9375 Mhz SHF

secondary 9375 MHz SHF

primary 8800 MHz SHF

secondary 9.375 MHz UHF

2. The colours used to denote variations in rainfall rate on an Airborne Weather Radar screen are........... for very light or no returns, ............... for light returns,........... for medium returns and ............ for strong returns

grey, green, yellow, red.

black, yellow, green, magenta.

black, green, yellow, magenta

black, green, yellow, red

3. Airborne weather radar operates on a frequency of

9375 MHz because it gives the best returns from rainfall associated with Cb

8800 MHz because gives the best returns from all types of precipitation

13300 MHz

9.375 GHz because this frequency is best for detecting aircraft in flight.

4. The centre of a small island is identified at the intersection of the 60° left bearing line and 15nm range arc of an airborne weather radar. If the aircraft's heading and height are 035° (M) and 42,500ft what QTE and range should be plotted in order to obtain a fix from the island? (variation is 20°W)

175 15nm

135 13nm

155 14nm

135 15nm

5. The mapping mode of Airborne Weather Radar utilises

a pencil/weather beam with a maximum range of 70 nm.

a cosecant/fan shaped beam which is effective to 150 nm.

a pencil/weather beam from 70 nm to 150 nm.

a cosecant/ fan shaped beam effective 50 nm to 70 nm.

6. A frequency used by airborne weather radar is

93.75 Ghz

9.375 GHz

8800 MHz

1213 Mhz

7. The antenna of an Airborne Weather Radar is stabilised

in pitch, roll and yaw.

in pitch and roll.

in pitch and roll but only when 0° tilt has been selected.

in pitch and roll whether the stabilisation is on or off.

8. An aircraft heading 017° (T) has a small island showing on the AWR at 45nm range on the 60° left azimuth line. To obtain a fix from this information you should plot

range 45nm and QTE 317 from the centre of the island

range 45nm and QTE 240 from the centre of the island.

range 45nm and QTE 137 from the centre of the island.

range 45nm and QTE 060 from the centre of the island.

9. A false indication of water may be given by the AWR display when

flying over mountainous terrain.

attempting to use the mapping beam for mapping in excess of 50 nm.

there is cloud and precipitation between the aircraft and a cloud target.

flying over land with the Land/Sea switch in the Sea position.

10. Using airborne weather radar the weather beam should be used in preference to the fan shaped beam for mapping in excess of _______ nm

20 to 25

150 to 200

100 to 150

60 to 70

11. The radar in an aircraft at FL370 detects a cloud at 60 nm. The cloud disappears when the tilt is selected to 2° UP. If the beamwidth of the radar is 6°, at what altitude are the tops of the clouds?

49,000 ft

43,000 ft

31,000 ft

6,000 ft

12. A prominent island is identified on the 30° right bearing line and the 10 nm range marker of an airborne weather radar. If the heading is 045° (T) and the aircraft is at FL360 what range and bearing should be plotted in order to obtain a fix?

8nm 075° (T)

8nm 255° (T)

10nm 075° (T)

10nm 030° (T)

13. An aircraft heading 137° (M) has a small island showing on the AWR at 45nm range on the 30° left azimuth line. Local variation is 12° W. To obtain a fix from this information you should plot

Range 45 nm and QTE 107 from the centre of the island.

Range 45 nm and QTE 287 from the centre of the island

Range 45 nm and QTE 275 from the centre of the island.

Range 45 nm and QTE 095 from the centre of the island.

14. An airborne weather radar is required to detect targets up to a maximum range of 200 nm. Ignoring pulse length and flyback in the CRT calculate the maximum PRR

750 pps

810 pps

405 pps

1500 pps

15. An Airborne Weather Radar system uses a frequency of 9 GHz because

the short wavelength allows signals to be reflected from cloud water droplets of all sizes.

the wavelength is such that reflections are obtained only from the larger water droplets.

it has a short wavelength so producing higher frequency returns.

the frequency penetrates clouds quite easily enabling good mapping of ground features in the mapping mode.

16. The correct sequence of colours of a colour Airborne Weather Radar as returns get stronger is

green yellow red.

red yellow green.

red green yellow.

yellow green red.

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