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Q1. The aircraft radio equipment which emits on a frequency of 4400 MHz is the :
radio altimeter.
Q2. In low altitude radio altimeters, the height measurement (above the ground) is based upon:
a frequency modulation wave, for which the frequency variation between the transmitted wave and the received wave after ground reflection is measured.
Q3. The operating frequency range of a low altitude radio altimeter is:
4200 MHz to 4400 MHz.
Q4. The operating frequency of the Radio Altimeter is normally:
between 4,250 and 4,350 MHz, FMCW
Q5. For most radio altimeters, when a system error occurs during approach the:
Height indication is removed
Q6. A radio altimeter can be defined as a:
self-contained on-board aid used to measure the true height of the aircraft
Q7. Modern low altitude radioaltimeters emit waves in the following frequency band:
SHF (Super High Frequency).
Q8. The Decision Height (DH) warning light comes on when an aircraft:
descends below a pre-set radio altitude.
Q9. 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. 4 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:
3,5
Q10. During the approach, a crew reads on the radio altimeter the value of 650 ft. This is an indication of the true:
height of the lowest wheels with regard to the ground at any time.
Q11. In low altitude radio altimeters, the reading is zero when main landing gear wheels are on the ground. For this, it is necessary to:
compensate residual altitude due to antennas height above the ground and coaxial cables length.
Q12. The modulation technique used by the Radio Altimeter is referred to as:
Frequency Modulated Continuous Wave
Q13. The data supplied by a radio altimeter:
indicates the distance between the ground and the aircraft.
Q14. The operation of the radio altimeter of a modern aircraft is based on:
frequency modulation of the carrier wave.
