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CPL Test Series
Question Bank
Questions for AWR
Answer the following questions
Test Mode
Training Mode
1. 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
Increase in area and move to the top of the screen
Decrease in area but not change in position on the screen.
Decrease in area and move to the top of the screen
Increase in area and appear nearer to the bottom of the screen
2. 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?
15900 ft above the aircraft.
31900 ft above the aircraft.
15900 below the aircraft.
31900 ft below the aircraft.
3. Which of the following list of phenomena are least likely to be detect by airborne weather radar?
Turbulence in cloud that has precipitation.
Wet snow and turbulence in cloud that has precipitation.
Clear air turbulence.
Precipiation.
4. 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.
5. What frequency is typical chosen for AWR systems?
9375 kHz.
93.375 GHz. (9 decimal 375 GHz).
93.75 GHz. (93 decimal 75 kHz).
93.75 MHz. (93 decimal 5 kHz).
6. 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?
5 degrees down tilt.
2.5 degrees down tilt.
0 degrees tilt.
2.5 degrees up tilt.
7. In an Airborne Weather Radar that has a colour cathode ray tube (CRT) the areas of greatest turbulence are indicated on the screen by
Iso-echo areas, which are, coloured black.
Blank iso-echo areas where there is no colour.
Colour zones being closest together.
Large areas of flashing red colour.
8. Ground checks of AWR are?
Unrestricted.
Allowed under specific health and safety regulations.
Prohibited at all times.
Allowed only when the aircraft has undergone major servicing.
9. In Airborne Weather Radar (AWR), the main factors which determine whether a cloud will be detected are
Size of the water drops and the wavelength/frequency used.
Rotational speed of radar scanner and the range from cloud.
Size of the water droplets and the diameter of the scanner.
Range from cloud and the wavelength/frequency used.
10. AWR contour mode is used for?
Shorts range mapping.
Identifying areas of maximum turbulence within a cloud.
Long range mapping.
Identifying rain bearing clouds.
11. An airborne weather radar unit transmits a 5 degrees beam from a parabolic dish aerial reflector assembly. If the wavelength is 4 cm, the diameter of the dish is?
87.5 cm
56 cm.
20 cm.
87.5 in.
12. Airborne Weather Radar has been primarily developed to detect?
The kinds of precipitation, which are usually accompanied by turbulence.
Areas of wind sheer and severe aircraft icing.
All kinds of frozen precipitation such as hail, snow and graupel.
Areas of severe clear air turbulence.
13. 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.
25 600 ft.
14 300 ft.
35 600 ft.
14. The theoretical maximum range for an airborne weather radar is determined by the?
Carrier wave frequency.
Pulse length.
Beam width.
Pulse repetition frequency.
15. In an AWR with a colour CRT areas of greater turbulence are indicated by?
Iso-echo areas with no colour.
Iso-echo areas coloured black.
Most rapid change of colour.
Large areas of flashing red.
16. The ISO-ECHO facility of an airborne weather radar is provided in order to
Extend the mapping range.
Inhibit unwanted ground returns.
Give an indication of cloud tops.
Detect areas of possible severe turbulence in cloud.
17. In the MAPPING MODE the airborne weather radar utilises a?
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.
Fan shaped beam effective up to a range of 150 nm.
18. The ISO-ECHO feature of an airborne weather radar can be used to detect?
Areas of possible turbulence is cloud.
Turbulence in cloud.
Wake turbulence.
CAT
19. Which of the following cloud types is most readily detected by airborne weather radar when using the weather beam?
Cumulus.
Stratus.
Altostratus
Cirrocumulus.
20. A frequency of 10 GHz is considered to be the optimum for use in airborne weather radar system because
Static interference is minimised
The larger water droplets will give good echoes and the antenna can be kept relatively small.
Greater detail can be obtained at the more distant ranges of the smaller water droplets.
Less power output is required in the mapping mode
21. To improve the detection of precipitation area(s) in e.g. Thunderstorms, in which the top of the cloud lies at or slightly above the level of flight?
The tilting setting should be lower when the selected range increase..
The tilting setting should be higher when the selected range decreases.
The tilting setting should be lower when the aircraft climbs to a higher altitude.
The tilting setting should be higher when the aircraft climbs to a higher altitude
22. In an Airborne Weather Radar the areas of greatest turbulence are usually indicated on the screen by?
Colour zones of red or magenta.
Colour zones of green or yellow.
Areas which are coloured black.
Blank areas where there is no colour.
23. The colours used on a conventional AWR to indicate increasing intensity of returns are?
Blue, Amber, Red.
Green, Yellow, Orange.
Green, Amber, Red.
Blue, Green, Red.
24. Airborne weather radar uses a particularly high frequency radar signal, at 9 to 12 GHz, in order to?
Make it possible to present a colour display of the weather situation.
Get good returns from droplets of water and other sorts of precipitation.
Al of the answers in this question are correct.
Get the most accurate range and bearing inforation.
25. 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.
Fan shaped beam effective up to a range of 15 NM.
Pencil beam effective from zero to 150 NM.
Pencil beam to a maximum range of 60 NM.
26. When using airborne weather radar in the mapping mode in polar areas one runs the risk?
Of getting a distorted because of the ice reflections.
Of aurora borealis (polar light) causing false returns.
Of mistaking the edge of coastal ice off shore for the real coastline.
Of understmating distance because the cold seawater is causing super refraction.
27. On a colour airborne weather radar, a bright red echo indicates?
An area of extreme turulence.
An area of strong windshear.
Strong rising air currents.
Heavy concentrations of liquid/solid water.
28. 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 orange to red.
Green to yellow to red.
Yellow to amber to blue.
Green to red to black.
29. 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
1, 2.
4
2, 3.
1, 2, 3.
30. Which of the following is a complete list of airborne weather radar antenna stabilisation axes?
Pitch and yaw.
Roll and pitch.
Roll, pitch and yaw.
Roll and yaw.
31. Airborne Weather Radars are generally based on the use of?
Secondary radar in the VHF band.
Secondary radar in the SHF band.
Primary radar in the SHF band.
Primary radar in the UHF band.
32. 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?
4000 ft above.
6000 ft below.
6000 ft above.
4000 ft below.
33. On the airborne weather radar display in WX mode, different colours use used?
To display different intensity of precipitation.
To display echoes from other aircraft.
To display clouds, indicating different levels of visibility.
To display ground height differences.
34. A height ring is used?
To determine the exact aeroplane height above the surface.
To determine that the weather radar is functioning.
As a zero point for range measurement.
As a range marker.
35. 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.
12000 ft above the level.
At the same level.
18000 ft above the level.
36. Before commencing a flight the weather radar should?
Be switched to stand-by, but not used until airborne.
Not be switched on until clear of buildings.
Be kept at stand-by until line-up with the runway.
Be switched to a range function after push-back to make sure it is functioning.
37. In Airborne Weather Radar (AWR), the main factors which determine whether a cloud will be detected are
Wavelength/frequency used.
Range from cloud.
Rotational speed of radar scanner.
Diameter of radar scanner.
38. On the AWR display the most severe turbulence will be shown?
In flashing red.
By a black hole.
Alternating red and white stripes.
By steep colour gradients.
39. Using the airborne weather radar, before take-off?
The radar transmitter should not be operated when personnel are observed in the sector ahead of the aircraft.
The gain control should be adjusted according to the light conditions expected after take-off.
The antenna tilt control should be set to maximum negative tilt.
The contract control should be adjusted to maximum contrast.
40. In which mode of operation does the aircraft weather radar use a cosecant radiation pattern?
MAPPING
MANUAL
WEATHER
CONTOUR.
41. When the airborne weather radar is operating in its primary mode, to detect precipitation?
The range will be limited, compared to the range obtainable in the ground mapping mode.
The radar beam is pencil shaped.
The radar beam is a cosecant beam.
Maximum tilt on the aerial will often be used.
42. The use of AWR on the ground is?
Permitted provided special precautions, to safeguard personnel and equipment.
Permitted provided reduced power is used.
Not permitted.
Only permitted to assist movement in low visibility conditions.
43. The heaviest turbulence is likely t be encountered?
About half way between two thunderstorm cells.
Where the area of heaviest precipitation is closest to the edge of the thunderstorm cell.
In the area of heaviest precipitation.
In the very core of a thunderstorm cell.
44. When switching on the weather radar, after start-up, a single very bright line appears on the screen. This means that the?
Transmitter is faulty.
Scanner is not rotating.
Scanning of the cathode ray tube is faulty.
Receiver is faulty.
45. Is is possible for weather radar to be operated on the ground?
No, never.
Yes, always.
Only whilst taxling
Yes, if operating within regulations and guidelines.
46. 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)?
5 degrees up.
0 degrees.
2.5 degrees up.
2.5 degrees down.
47. 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?
52.5 in.
52.5 cm.
20 cm.
20 in.
48. Which of the following lists phenomena that CANNOT be detected by weather radar?
Snow; turbulence in clouds with preciptation.
Clear air turbulence; turbulence in cloud with precipitation
Snow; clear air turbulence
Dry hail; clear air turbulence
49. In which frequency band do most Airborne Weather radars operate?
UHF.
SHF.
EHF.
VHF.
50. The "gain" control knob of an AWR adjusts?
The brightness of the display.
The automatic gain control of the AWR is activated.
The power level of the transmitted energy is made dependent on the selected range.
The receiver sensitivity in order to achieve optimum target acquisition.
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