Vayudoot Aviation

1. The antenna of an Airborne Weather Radar is stabilised

in pitch and roll.

in pitch, roll and yaw.

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

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

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

red green yellow.

yellow green red.

red yellow green.

green yellow red.

3. 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)

135 13nm

135 15nm

175 15nm

155 14nm

4. 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 095 from the centre of the island.

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

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

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

5. The mapping mode of Airborne Weather Radar utilises

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

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

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

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

6. Airborne weather radar operates on a frequency of

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

13300 MHz

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

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

7. 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, green, yellow, red

black, yellow, green, magenta.

black, green, yellow, magenta

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 060 from the centre of the island.

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.

9. 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

1500 pps

750 pps

810 pps

405 pps

10. A frequency used by airborne weather radar is

9.375 GHz

1213 Mhz

93.75 Ghz

8800 MHz

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

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

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

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

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

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

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

flying over mountainous terrain.

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

secondary 9.375 MHz UHF

secondary 9375 MHz SHF

primary 9375 Mhz SHF

primary 8800 MHz SHF

14. 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?

31,000 ft

6,000 ft

49,000 ft

43,000 ft

15. 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

60 to 70

150 to 200

100 to 150

16. 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?

10nm 030° (T)

10nm 075° (T)

8nm 255° (T)

8nm 075° (T)

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