Free ATPL instrumentation 022 questions: 7 with answers
7 instrumentation questions from the ATPL bank of ForAllPilots, with no account and no sign-up. Answer in your head, then open the answer: the right letter and its explanation are under each question. The full bank has 1,051 questions for this subject.
The 7 questions
Question 1 · 022 06 automatic flight control
Mode ""Localizer ARM"" active on Flight Director means:
- ASystem is armed for localizer approach and coupling will occur upon capturing center line
- BLocalizer is armed and coupling will occur when flag warning disappears
- CLocalizer ALARM, making localizer approach not authorized
- DCoupling has occurred and system provides control data to capture the centerline
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Answer: A. System is armed for localizer approach and coupling will occur upon capturing center line
'Localizer ARM' on the flight director means the system is armed to automatically capture and couple to the localizer once the centreline is intercepted.
Question 2 · 022 12 Alerting and proximity systems
The operating frequency range of a low altitude radio altimeter is:
- A5 GHz.
- B2700 MHz to 2900 MHz.
- C5400 MHz or 9400 MHz.
- D4200 MHz to 4400 MHz.
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Answer: D. 4200 MHz to 4400 MHz.
The typical operating frequency range for a low-altitude radio altimeter is approximately 4,200 to 4,400 MHz.
Question 3 · 022 02 Measurement of air-data parameters
In An Air Data Computer (ADC), aeroplane altitude is calculated from:
- AMeasurement of absolute barometric pressure from a static source on the fuselage
- BThe difference between absolute and dynamic pressure at the fuselage
- CMeasurement of elapsed time for a radio signal transmitted to the ground surface and back
- DMeasurement of outside air temperature (OAT)
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Answer: A. Measurement of absolute barometric pressure from a static source on the fuselage
In an ADC, altitude is calculated from measured absolute (static) barometric pressure sensed at the fuselage static source.
Question 4 · 022 13 electronic displays
Cockpit alarms/warnings requiring immediate crew awareness are standardised to use the colour:
- Ablue for warnings, green for cautions
- Ball alarms use a single colour with no distinction
- Cpurple for warnings, orange for cautions
- Dred for warnings, amber/yellow for cautions
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Answer: D. red for warnings, amber/yellow for cautions
Standard cockpit alerting colour convention: red=warning (immediate action), amber/yellow=caution (awareness/timely action).
Question 5 · 022 02 Measurement of air-data parameters
The vertical speed indicator (VSI) is fed by :
- Adynamic pressure
- Bstatic pressure
- Ctotal pressure
- Ddifferential pressure
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Answer: B. static pressure
The VSI is fed exclusively by static pressure, sensing its rate of change through a calibrated leak/diaphragm.
Question 6 · 022 01 Sensors and instruments
The disadvantage of an electronic rpm indicator is the :
- Ageneration of spurious signals at the commutator.
- Binfluence of temperature on the indication.
- Cnecessity of providing a power supply source.
- Dhigh influence of line resistance on the indication.
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Answer: C. necessity of providing a power supply source.
An electronic RPM indicator's main drawback is that it requires its own electrical power supply to function, unlike a simple self-generating tachometer.
Question 7 · 022 10 Communication systems
Which VHF frequency is dedicated to emergencies in aeronautics?
- A118.0 MHz
- B136.0 MHz
- C121.5 MHz
- D123.45 MHz
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Answer: C. 121.5 MHz
The frequency 121.5 MHz is the international aeronautical emergency VHF frequency (ICAO Annex 10).
Each answer was checked again before publication; like every explanation on the site, these may contain errors. Some explanations were rewritten for this page, sometimes with the help of an AI. Spotted a mistake? Write to us at contact@forallpilots.com.
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