Aircraft Instrumentation MCQ – Set 3

This set of Aircraft Instrumentation Multiple Choice Questions & Answers (MCQs) focuses on “Head-Up Displays”

1. Head-Up Display displays the data on _____
a) Cathode Ray Tube
b) Anode Ray Tube
c) Tungsten Tube
d) CFL Tube
View Answer

Answer: a
Explanation: Head-Up Display displays data on Cathode Ray Tube which is further projected onto reflector plate in Symbolic Manner so that data can assist Pilot during the flight of an aircraft.

2. Head-Up Displays save time of transition from checking instruments in aircraft and conditions outside the aircraft.
a) True
b) False
View Answer

Answer: a
Explanation: As during the Critical Situations or Landing, pilot has to frequently transit between data given by instruments in aircraft and conditions outside the aircraft. Head-Up Displays directly project these data on Screen of the pilot which saves time of transition, as pilot does not have to look up for various instruments reading on panel.

3. Following Diagram represents basic layout of ______
basic layout of Head-Up Display
a) LCD
b) LED
c) Head-Up Display
d) Counter Display
View Answer

Answer: c
Explanation: Above diagram indicates Head-Up Display which consists of Reflector Plate and Source Light which has Pictorial Data which is projected on screen known as Visual Approach Monitor, whereas LCD is liquid crystal display and LED is a light emitting diode.
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4. Length or range of Head-Up Display Scales normally cover narrow bands of airspeed and altitude information.
a) False
b) True
View Answer

Answer: b
Explanation: The length or range, of the scales is determined by operational requirements, but normally they only cover narrow bands of airspeed and altitude information, because this helps to reduce irrelevant markings and the time taken to read and interpret the information presented.

5. The error between actual airspeed and that selected on the control module is indicated by variations in _____
a) Intensity of Sound Alarm
b) Intensity of Light
c) Signal Intensity
d) Intensity of Radar
View Answer

Answer: b
Explanation: The error between actual airspeed and that selected on the control module is indicated by variations in the light intensity of the three symbols which indicates the aircraft’s approach speed is correct, too slow or too fast.

6. To get different types of colour in LED, proportion of which constituents is varied?
a) Gallium Phosphide and Gallium Arsenide Phosphide
b) Nitrogen Phosphide
c) Aluminium Oxide
d) Nitrogen Pentoxide
View Answer

Answer: a
Explanation: To provide different colours, the proportion of GaP (Gallium Phosphide) and GaAs (Gallium Arsenide Phosphide) is varied during manufacture of the chip, and also the technique of ‘doping’ with other elements e.g. oxygen or nitrogen is applied to get different colors of light.

7. The following Diagram represents _____
Visual Approach Monitor
a) Synchroscope
b) Light Emitting Diode
c) Liquid Crystal Display
d) Visual Approach Monitor
View Answer

Answer: d
Explanation: Above display is known as Visual Approach Monitor. The display unit is mounted on a sliding tray located at a glare shield panel in front of the pilot, and when required, the tray is pulled out to automatically raise the lens through which the display is projected.
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8. In case of Seven Segment Display we cannot increase the number of Displays according to the Overall Size and Appearance.
a) True
b) False
View Answer

Answer: b
Explanation: We can increase the number of displays in Seven Segment Display to increase its intensity by adding core-shaped reflecting cavity at the top of each LED, then this assembly is casted using glass-filled epoxy which increases its intensity around twenty times.

9. Following Diagram represents Reflector Windscreen on which Head-Up display system projects the aerodynamic data. In this diagram what does this Horizontal Bold Black Line having Concentric two dots at its Center indicate?
Black Bold Line represents Rolling and Pitching attitude of an aircraft
a) Airspeed
b) Altitude
c) Roll and Pitch Attitude
d) Director Dot
View Answer

Answer: c
Explanation: The Black Bold Line represents Rolling and Pitching attitude of an aircraft, whereas Airspeed is indicated by Horizontal Dotted Line above the Black Bolded Line, Altitude is given by Vertical Dotted Line beside Black Bolded Line and Concentric Circles are known as Director Circle.
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Sanfoundry Global Education & Learning Series – Aircraft Instrumentation.

To practice all areas of Aircraft Instrumentation, here is complete set of Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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