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Question Bank
Questions for KW RADIO ALTIMETER
Answer the following questions
Test Mode
Training Mode
1. Modern low altitude radio altimeters emit waves in the following frequency band?
HF (High Frequency).
UHF (Ultra High Frequency).
VLF (Very Low Frequency).
SHF (Super High Frequency).
2. A radio altimeter has a maximum effective height because?
At greater heights the signal will be undetectable.
At greater heights the signal will be absorbed by moisture in the air
At greater heights the signal will be too weak.
At greater heights signal from different modulation cycles will overlap.
3. The failure of the radio altimeter would cause?
Loss of altitude data.
Loss of height data.
Loss of pressure altitude data.
Loss of density altitude data.
4. The operation of the radio altimeter of a modern aircraft is based on?
Frequency modulation of the carrier wave.
A combination of frequency modulation and pulse modulation.
Pulse modulation of the carrier wave.
Amplitude modulation of the carrier wave.
5. The aircraft radio equipment which emits on a frequency of 440 MHz is the?
High altitude radio altimeter.
Primary rada.
Radio altimetter.
Weather radar.
6. A radio altimeter will indicate zero when the aircraft is on the ground because of? 1. Frequency modulation of the transmitted signal. 2. Allowance for the signal path through the aircraft. 3. Allowance for the height of the aerials above the main wheels. 4. Beam width compensation. 5. Reducation in gain rate very close to the surface.
1, 2.
2, 3.
3, 4.
4, 5.
7. A RADALT provides?
Radio altitude.
Pressure altitude.
Density altitude.
Height above terrain.
8. The frequency range used by a low altitude radio altimeter is?
1200 MHz to 1500 MHz.
115 GHz to 750 GHz.
4200 MHz to 4400 MHz.
5 GHz.
9. Radio altimeters employ?
AM.
Pulsed FM.
Pule modulation.
FM.
10. Low altitude radio altimeters operate on the ___________wavelength?
Metric.
Decimetric.
Centimetric.
Millimetric.
11. The data supplied by a radio altimeter?
Is used only by the radio altimeter indicator.
Is used by the automatic pilot in the altitude hold mode.
Concerns only the decision height.
Indicates the distance between the ground and the aircraft.
12. A RADALT system is?
Ground based and measures true height.
Ground based and measures true altitude.
Aircraft based and measures true height.
Aircraft based and measures true altitude.
13. Radio altimeters work on the principal of?
Frequency modulation.
Pulse modulation.
Pulse the amplitude modulation.
Amplitude modulation.
14. If there is a fault in the system the radalt display will?
True red and activate an aural warning.
Freeze.
Turn red and activate visual and aural warnings.
Needle will disappear and an alarm flag will appear, possibly accompanied by an audio warning.
15. A radio altimeter is?
Aircraft based and indicates true altitude.
Ground based and employ microwaves.
Aircraft based and indicates pressure altitude.
Aircraft based and indicates true beight.
16. For the landing configuration a radio altimeter indicates?
Height of the flight deck above the ground.
Altitude.
Height of the main wheel above the ground.
Height of the aircraft above the ground.
17. The operating frequency range of a low altitude radio altimeter is?
5 GHz.
5400 MHz or 9400 MHz.
4200 MHz to 4400 MHz.
2700 MHz to 2900 MHz.
18. A radio altimeter measures?
Height above sea level.
True Altitude.
Height above the ground or water over which the aircraft if flying
Pressure altitude.
19. In low altitude radio altimeters height measurement (above ground) is based upon?
A pulse transmission, for which time between transmission and reception is measured on a circular scanning screen.
A frequency modulation wave, for which the frequency variation between the transmitted wave and the received wave after ground reflection is measured.
A wave transmission, for which the frequency shift by DOPPLER effect after ground reflection is measured.
A triangular amplitude modulation wave, for which modulation phase shift between transmitted and received waves after ground reflection is measured.
20. For most radio altimeters,when a system error occurs during approach the?
Audio warning signal sounds.
DH lamp flashes red and the audio signal sounds.
DH lamp flashes red.
Height indication is removed.
21. A radio altimeter can be defined as a?
Ground radio aid used to measure the true height of the aircraft.
Ground radio aid used to measure the true altitude of the aircraft.
Self-contained on-board aid used to measures the true altitude of the aircraft.
Self-contained on-board aid used to measure the true height of the aircraft.
22. In low altitude ratio altimeters, the reading is zero when main landing gear wheels are on the ground. For this, it is necessary to?
Place the antennas on the bottom of the aeroplane.
Change the display scale in short final, In order to have a precise readout.
Compensate residual altitude due to antennas height above above the ground and coaxial cable length.
Account for signal processing time in the unit and apply a correction factor to the reading.
23. Low altitude altimeters use the __________ waveband?
UHF.
SHF.
VHF.
HF
24. A radalt is?
Aircraft based and measures true altitude.
Ground based and measures true height.
Ground based and measures true altitude.
Aircraft based and measures true height.
25. A RADALT employs _________ waveband?
VHF.
SHF
UHF
HF.
26. Radio altimeters are based on the principle of?
Amplitude modulated carrier wave.
Continuous wave.
Frequency modulated carrier wave.
Pulse modulated carrier wave.
27. During the qpproach, a crew reads on the radio altimeter the value of 650 ft. The is an indication of the true?
Altitude of the aircraft.
Height of the aircraft with regard to the runway.
Height of the aircraft with to the ground at a any time.
Height of the lowest wheels with regard to the ground at any time.
28. Radio altimeters are accurate only within the height range?
Zero to 500 ft.
Zero ft to 2500 ft.
Zero to 50 ft.
50 ft to 2700 ft.
29. The low-altitude radio altimeters used in precision approaches: 1.Operate in the 1540-1660 MHz range. 2.Are of the pulsed type. 3. Are of the frequency modulation type. 3. Have an operating range of 0 to 5000 ft. 5. Have a precision of +/-2 feet between 0 and 500 ft. The combination of the correct statements is?
3,4.
3,5.
1,2,5.
2,3,4.
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