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CPL Test Series
Question Bank
Questions for AWR
Answer the following questions
Test Mode
Training Mode
1. Airborne Weather Radar has been primarily developed to detect?
Areas of wind sheer and severe aircraft icing.
Areas of severe clear air turbulence.
The kinds of precipitation, which are usually accompanied by turbulence.
All kinds of frozen precipitation such as hail, snow and graupel.
2. AWR contour mode is used for?
Long range mapping.
Identifying areas of maximum turbulence within a cloud.
Identifying rain bearing clouds.
Shorts range mapping.
3. On the airborne weather radar display in WX mode, different colours use used?
To display clouds, indicating different levels of visibility.
To display echoes from other aircraft.
To display different intensity of precipitation.
To display ground height differences.
4. Ground checks of AWR are?
Allowed only when the aircraft has undergone major servicing.
Allowed under specific health and safety regulations.
Unrestricted.
Prohibited at all times.
5. AWR in the __________ Mode progressively _________ As distances ___________ To equalise screen brightness?
Mapping, increases gain, decreases.
Mapping, decreases power, decreases.
Weather, decreases gain, increases.
Weather, increases power, decreases.
6. The airborne weather radar uses the following wavelength?
Centimetric.
Myriametic.
Metric.
Hectometric.
7. In the MAPPING MODE the airborne weather radar utilises a
Fan shaped beam effective up to a maximum of 50 NM to 60 NM range.
Pencil beam effective from zero to 150 NM.
Pencil beam to a maximum range of 60 NM.
Fan shaped beam effective up to a range of 15 NM.
8. The antennae of modern airborne weather radars are stabilized by means of?
Mercury swiches.
Feedback from the antenna accelerometers.
Artificial gravity switches.
Inputs from the aircraft's atitude system.
9. A frequency of airborne weather radar is
9375 MHz.
93.75 MHz.
9375 kHz.
9375 GHz.
10. The ISO-ECHO facility of an airborne weather radar is provided in order to
Inhibit unwanted ground returns.
Give an indication of cloud tops.
Detect areas of possible severe turbulence in cloud.
Extend the mapping range.
11. A side lobe from an aerial of a weather radar may produce an echo on the screen known as a "height ring". The pilot can use this?
As a zero point for range measurement.
To determine the aeroplane's height above the surface.
As a range marker.
To determine that the weather radar is functioning.
12. An airborne weather radar, with a beam width of 4 degrees in azimuth, is being used in the mapping mode. At what maximum range will it be able to detect a 1 nm wide opening in a sea cliff?
4 nm.
60 nm.
15 nm.
45 nm.
13. In an Airborne Weather Radar that has a colour cathode ray tube (CRT) increasing severity of rain and turbulence is generally shown by a change of colour from
Yellow to amber to blue.
Green to red to black.
Green to yellow to red.
Yellow to orange to red.
14. The theoretical maximum range for an airborne weather radar is determined by the?
Pulse repetition frequency.
Beam width.
Carrier wave frequency.
Pulse length.
15. Which of the following cloud types is most readily detected by airborne weather radar when using the weather beam?
Cirrocumulus.
Cumulus.
Stratus.
Altostratus
16. Airborne Weather Radars are generally based on the use of?
Primary radar in the UHF band.
Secondary radar in the SHF band.
Secondary radar in the VHF band.
Primary radar in the SHF band.
17. The AWR can be used on the ground provided: 1. The aircraft is clear of personnel, buildings and vehicles. 2. The conical beam is selected. 3. Maximum up tilt is selected. 4. The AWR must never be operated on the ground
2, 3.
1, 2, 3.
4
1, 2.
18. In an AWR with a colour CRT areas of greater turbulence are indicated by?
Large areas of flashing red.
Iso-echo areas coloured black.
Iso-echo areas with no colour.
Most rapid change of colour.
19. When the airborne weather radar is operating in its primary mode, to detect precipitation?
The radar beam is pencil shaped.
The radar beam is a cosecant beam.
Maximum tilt on the aerial will often be used.
The range will be limited, compared to the range obtainable in the ground mapping mode.
20. The cosecant squared beam is used for mapping in the AWR because?
A larger area of ground is illuminated by the beam.
It allows cloud detection to be effected while mapping.
A wider beam is produce din azimuth to give a greater coverage.
A greater range can be achieved.
21. When using the AWR to detect long range ground features the most suitable mode of operation or beam selected would be?
The contour mode.
The mapping mode.
The manual mode.
The fan shaped beam.
22. Before commencing a flight the weather radar should?
Be switched to a range function after push-back to make sure it is functioning.
Not be switched on until clear of buildings.
Be kept at stand-by until line-up with the runway.
Be switched to stand-by, but not used until airborne.
23. The colours used on a conventional AWR to indicate increasing intensity of returns are?
Blue, Green, Red.
Blue, Amber, Red.
Green, Amber, Red.
Green, Yellow, Orange.
24. In the MAPPING MODE the airborne weather radar utilises a?
Fan shaped beam effective up to a range of 150 nm.
Pencil beam effective to a maximum range of 60 nm,
Fan shaped beam effective up to a maximum range of 50 nm to 60 nm.
Pencil beam effective from zero to 150 nm.
25. In an Airborne Weather Radar the areas of greatest turbulence are usually indicated on the screen by?
Colour zones of red or magenta.
Areas which are coloured black.
Colour zones of green or yellow.
Blank areas where there is no colour.
26. An airborne weather radar is using a 3 degrees beam. A cloud is detected at a range of 40 nm, If the scanner is tilted up to 3 degrees the cloud disappears. The top of the cloud, in relation to the aeroplane's cruising level is approximately?
6000 ft above the level.
At the same level.
18000 ft above the level.
12000 ft above the level.
27. In order to ascertain whether a cloud return on an Aircraft Weather Radar (AWR) is at or above the height of the aircraft, the tilt control should be set to (assume a beam width of 5 degrees)?
0 degrees.
5 degrees up.
2.5 degrees down.
2.5 degrees up.
28. The heaviest turbulence is likely t be encountered?
In the area of heaviest precipitation.
About half way between two thunderstorm cells.
In the very core of a thunderstorm cell.
Where the area of heaviest precipitation is closest to the edge of the thunderstorm cell.
29. The use of AWR on the ground is?
Permitted provided special precautions, to safeguard personnel and equipment.
Only permitted to assist movement in low visibility conditions.
Permitted provided reduced power is used.
Not permitted.
30. Weather radar is used by the pilot to assist in the?
Detection and determination of a route through active cloud formations.
Detection and avoidance of turbulence.
Detection of other aircraft through clouds.
Detection and avoidance of potentially turbulent cloud cells.
31. The airborne weather radar is using a 5 degree beam. The cloud is detected at a range of 60 nm. If the scanner is tilted up to 5 degrees, the cloud disappears. Using trigonometry to determine the height of the tops of the cloud, in relation to the aeroplanes cruising level, select the nearest answer from the following?
31900 ft above the aircraft.
15900 below the aircraft.
31900 ft below the aircraft.
15900 ft above the aircraft.
32. The ISO-ECHO circuit is incorporated in the AWR?
To display areas of turbulence.
To allow simultaneous mapping and detection of clouds.
To alert pilots to the presence of cloud.
To allow ground mapping.
33. On an AWR the sequence of colours indicating increasing water droplet size is?
Blue, amber, red.
Green, Yellow, red.
Blue, green, red.
Black, amber, red.
34. The ISO-ECHO feature of an airborne weather radar can be used to detect?
Wake turbulence.
Turbulence in cloud.
Areas of possible turbulence is cloud.
CAT
35. Which of the following lists phenomena that CANNOT be detected by weather radar?
Clear air turbulence; turbulence in cloud with precipitation
Snow; turbulence in clouds with preciptation.
Snow; clear air turbulence
Dry hail; clear air turbulence
36. The main factors, which affect whether an AWR will detect a cloud, are?
The size of the water droplets and the range to the cloud.
The size of the water droplets and the wavelength/frequency.
The size of the water droplets and the diameter of the antenna reflector.
The scanner rotation rate and the wavelength/frequency.
37. The "gain" control knob of an AWR adjusts?
The power level of the transmitted energy is made dependent on the selected range.
The brightness of the display.
The automatic gain control of the AWR is activated.
The receiver sensitivity in order to achieve optimum target acquisition.
38. Which statements relating to the stabilization system of airborne weather radar antennae is true?
The pilot can choose the axes of stabilization with the system's stabilization selector switch.
The are stabilized with respect to the yaw axis, but not with respect to the pitch and roll axes.
They are stabilized with respect to the pitch and roll axes but not with respect to the yaw axis.
They are stabilized with respect to the pitch, roll and yaw axes.
39. Airborne weather radar system use a wavelength of approximately 3 cm in order to
Obtain optimum use of the Cosecant squared beam.
Detect the smaller cloud formations as well as large.
Transmit at a higher pulse repetition frequency for extended range.
Detect the larger water droplets.
40. In Airborne Weather Radar (AWR) the main factors that determine whether or not a cloud will be detected are?
Size of the water droplets and the diameter of the radar scanner.
Rotational speed of the radar scanner, range from cloud.
Range to the cloud, wavelength/frequency used.
Size of the water droplets, and the wavelength/frequency used.
41. An airborne weather radar unit transmits a 4 degrees beam from a parabolic dish aerial reflector assembly. If the wavelength is 3 cm, the diameter of the dish is?
20 cm.
20 in.
52.5 in.
52.5 cm.
42. A weather radar, set to the 100 NM scale, shows a squall at 50 NM. By changing the scale to 50 NM, the return on the radar screen should
Decrease in area and move to the top of the screen
Increase in area and appear nearer to the bottom of the screen
Increase in area and move to the top of the screen
Decrease in area but not change in position on the screen.
43. On the AWR display the most severe turbulence will be shown?
In flashing red.
By a black hole.
By steep colour gradients.
Alternating red and white stripes.
44. If the AWR transmitter is to be switched on before take-off the scanner should be tilted up with?
The mapping mode selected.
none of the above.
The weather mode selected.
Either of the modes selected.
45. In an AWR with a 5 degrees beam width how do you orient the scanner to receive returns from clouds that are at or below your level?
0 degrees tilt.
5 degrees down tilt.
2.5 degrees down tilt.
2.5 degrees up tilt.
46. The tilt angle on the AWR at which an active cloud just disappears from the screen is 4 degrees up. If the beam width is 5 degrees and the range to the cloud is 40 nm use the 1 in 60 rule to calculate the approximate height of the cloud relative to the aircraft?
6000 ft below.
4000 ft below.
6000 ft above.
4000 ft above.
47. An aircraft flying at 25 00 feet is equipped with AWR. The beam width is 5 degrees. With the radar tilted 3.5 degrees up, the radar is showing top of a cloud return at 105 nm. The approximate height of the cloud is
30 300 ft.
14 300 ft.
25 600 ft.
35 600 ft.
48. What frequency is typical chosen for AWR systems?
93.75 MHz. (93 decimal 5 kHz).
93.75 GHz. (93 decimal 75 kHz).
9375 kHz.
93.375 GHz. (9 decimal 375 GHz).
49. In an Airborne Weather Radar that has a colour cathode ray tube (CRT) the areas of greatest turbulence are indicated on the screen by
Blank iso-echo areas where there is no colour.
Iso-echo areas, which are, coloured black.
Colour zones being closest together.
Large areas of flashing red colour.
50. In weather radar the use of a cosecant beam in 'Mapping' mode enables
Scanning of a large ground zone producing echoes whose signals are practically independent of distance.
Better reception of echoes on contrasting terrain such as ground to sea.
A greater radar range to be achieved.
Higher definition echoes to be produced giving a clearer picture.
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