This set of Aircraft Design Multiple Choice Questions & Answers (MCQs) focuses on “Subsystems”.
1. Which of the following is an example of an aircraft subsystem?
a) Pneumatic
b) Gear retraction
c) Landing gear
d) High lift device
View Answer
Explanation: Pneumatic system is an example of aircraft subsystem. Gear retraction refers to the method and configuration through which landing gears are retracted in the aircraft. Landing gear are used to withstand impact during landing.
2. Which of the following is considered to be correct subsystem to deflect control surface?
a) Hydraulic system
b) Pneumatic subsystem
c) Fuel system
d) Deice system
View Answer
Explanation: Hydraulic subsystem will be correct choice for control surface deflection. Pneumatic subsystem is used for low power or pressure requirements. Fuel system includes fuel tanks, fuel lines etc.
3. A pneumatic subsystem is used to ______________
a) provide compressed air for pressurization
b) more pressure output
c) deflect control surface
d) provide electrical power
View Answer
Explanation: A typical pneumatic system is used for operation requiring less amount of power or pressure. It is used to provide compressed air for pressurization of the aircraft. More pressure output can be achieved by using hydraulic system.
4. Following diagram represents _____________
a) simplified hydraulic system
b) wing loading diagram
c) pneumatic subsystem
d) fuel tank location
View Answer
Explanation: A typical hydraulic system is shown. A simplified hydraulic system can be observed in the diagram. As shown in the diagram a simplified hydraulic system includes actuators, feed lines etc. Fuel tank can be located in fuselage, in wing or in tail.
5. Hydraulic system affect conceptual design based on __________
a) hydraulic pump space requirements
b) space for control surface
c) secondary control surface
d) lift required at tail
View Answer
Explanation: A typical hydraulic system will affect conceptual design based on space requirements for pumps typically. Control surface are located at the wing or at tail section. Lift required at tail will be affected by which type of airfoil is used.
6. A typical electrical system may include _________
a) generators, transformers, cables, etc
b) only generator
c) drag polar system
d) only transformers
View Answer
Explanation: A typical electrical system consists of generators, transformers, cables etc. It is used to provide electrical energy. Drag polar is graphical representation of drag. It is used to show relationship between drag and lift.
7. Following diagram represents _________
a) Typical APU system at tail
b) Hydraulic system
c) Thrust augmentation
d) Fuel system
View Answer
Explanation: APU is an example of subsystem of aircraft. Hydraulic system is used for higher output power. Thrust augmentation is used to increase the amount Thrust. Thrust augmentation can be used for short takeoff distance.
8. Let’s consider we need to design avionics system for general aviation aircraft. If empty weight of aircraft is 100 unit then what will be the approximate range of required avionics weight.
a) 1 unit to 3 unit
b) 0.3 to 0.5 units
c) 0.58 units
d) 4 to 5 units
View Answer
Explanation: Given, empty weight, W = 100 unit.
Typically, range of avionics weight can be estimated as follows.
Avionics weight range = 0.01*W to 0.03*W
= 0.01*100 to 0.03*100 = 1 unit – 3 unit.
9. Avionics stands for __________
a) aviation electronics
b) airfare electrons
c) aviation electrical
d) prop aircraft
View Answer
Explanation: Avionics system stands for Aviation electronics. A typical avionics system include radar, radio, flight instruments, flight control computer etc. It is required to consider sufficient volume for avionics system. Prop aircraft consists of a propeller and other primary segments.
10. APU exhaust should be directed upward.
a) True
b) False
View Answer
Explanation: Typically, APU is nothing but another jet engine that requires its own inlet and outlet. An APU is used to provide ground power. Exhaust from the APU should be directed upward is true. This is done in order to reduce the amount of noise produced by inlet and exhaust.
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