Aircraft Design Questions and Answers – Landing Gear Arrangements

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This set of Aircraft Design Multiple Choice Questions & Answers (MCQs) focuses on “Landing Gear Arrangements”.

1. Following diagram represents ____________
aircraft-design-questions-answers-landing-gear-arrangements-q1
a) bicycle
b) tricycle
c) tail dragger
d) quadruple
View Answer

Answer: a
Explanation: Typical bicycle landing gear arrangement is shown in the above diagram. As shown in the diagram, bicycle arrangement has 2 main landing gear and small outrigger wheels. It requires flat attitude for operation.
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2. Following diagram represents _________
aircraft-design-questions-answers-landing-gear-arrangements-q2
a) tail dragger
b) bicycle
c) tricycle
d) single main
View Answer

Answer: a
Explanation: Above diagram is representing a typical tail dragger landing gear arrangement. As shown in the diagram, tail dragger configuration has two main gears located ahead of cg. It also includes an auxiliary wheel at tail as shown in the diagram.

3. Following diagram represents _________
aircraft-design-questions-answers-landing-gear-arrangements-q3
a) tricycle
b) bicycle
c) quadric cycle
d) tail pusher
View Answer

Answer: a
Explanation: Typical tricycle landing gear arrangement is shown in the above diagram. As shown in the diagram, two main landing gears are located after the c.g. It has an auxiliary third wheel which is placed forward of the centre of gravity.

4. Following diagram represents ________
aircraft-design-questions-answers-landing-gear-arrangements-q4
a) quadricycle
b) tail pusher
c) tail dragger
d) bicycle
View Answer

Answer: a
Explanation: Typical quadricycle landing gear arrangement is shown in the above diagram. As shown in the diagram, quadricycle landing gear arrangement has 4 landing gears. It is similar to bicycle but wheels are at sides of the fuselage.

5. Following diagram represents _________
aircraft-design-questions-answers-landing-gear-arrangements-q5
a) multi bogey
b) pusher prop
c) wing
d) bicycle
View Answer

Answer: a
Explanation: Above diagram is illustrating a typical multi- bogey landing gear arrangement. As shown in the diagram, multi bogey arrangement has more than 4 wheels to support higher impact loads and to carry heavy structure. Pusher prop is type of engine propulsion system.
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6. Following diagram represents _________
aircraft-design-questions-answers-landing-gear-arrangements-q6
a) single main landing gear arrangement
b) wing lofting
c) empennage section
d) thrust loading chart
View Answer

Answer: a
Explanation: Above diagram is showing typical single main landing gear arrangement. Lofting is used to generate overall wing shape via conic lofting method. Empennage is tail portion of the aircraft. Thrust loading is defined as thrust to weight ratio.

7. Typically, an aircraft weighing lower than 50000 lb will adopt __________
a) single main gear
b) bicycle
c) tail dragger
d) tricycle
View Answer

Answer: a
Explanation: Given, weight W = 50000 lb. If weight w < 50000 lb then, the single main landing gear arrangement is used. Other arrangements are used if weight w is > 50000 lb.

8. What is the following is correct?
a) Quadricycle landing gear arrangement requires Flat takeoff attitude
b) Lift is always same as weight
c) Drag is always higher than weight
d) Thrust loading is weight to lift ratio
View Answer

Answer: a
Explanation: Quadricycle landing gear arrangement requires flat attitude for takeoff and landing. It is similar to bicycle arrangement. Lift is not always same as weight. Thrust loading is ratio of thrust to weight.

9. What is the location of main wheel in tricycle gear?
a) After CG of the aircraft
b) At CG
c) Before CG
d) At nose
View Answer

Answer: a
Explanation: Main wheel is located after the cg of the aircraft in typical tricycle landing gear arrangement. This arrangement is stable. An auxiliary wheel is located ahead of cg of the aircraft. It can be used for large crab angle as well.
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10. Which of the following is disadvantage of tail dragger?
a) Inherent unstable
b) Most stable
c) Inherent stable
d) It has 4 wheels to support the aircraft
View Answer

Answer: a
Explanation: Tail dragger arrangement consists total of 3 wheels: 2 main and 1 auxiliary. Tail dragger arrangement is inherently Unstable. Tail dragger arrangement provides more propeller clearance and it is lighter in weight.

11. The term marked by ‘?’ in the following diagram is called __________
aircraft-design-questions-answers-landing-gear-arrangements-q11
a) Overturn angle
b) Overnose angle
c) Grazing angle
d) AOA
View Answer

Answer: a
Explanation: The term marked is called overturn angle. It is measure of the tendency to overturn during taxied around sharp corner. For typical aircrafts this should not be more than 63°. AOA is angle between relative freestream velocity and chord.

12. What is tipback angle?
a) Maximum attitude of an aircraft with tail touching the ground with struts fully extended
b) Wing loading divided by span
c) Lift to drag ratio
d) Maximum altitude of an aircraft
View Answer

Answer: a
Explanation: Tipback angle is defined as Maximum attitude of an aircraft with tail touching the ground and the struts are completely extended. Wing loading is the ratio of weight and reference area. Lift to drag ratio is called aerodynamic efficiency.

13. An aircraft is supported by bicycle landing gear arrangement. If wheel base is 10 unit then, scale location of CG.
a) 5 unit aft from front wheel
b) 10 unit
c) 20 unit from front wheel
d) 25 unit from back wheel
View Answer

Answer: a
Explanation: Typically, for bicycle landing gear CG is aft of the midpoint between two wheels measured from front wheel.
Hence, Location of CG = distance/2 = 10/2 = 5 unit aft from front wheel.
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14. Which of the following is correct?
a) Landing gear is also termed as undercarriage
b) Tail dragger arrangement is most stable
c) Lift coefficient is same as weight always
d) Lift to thrust is called thrust loading
View Answer

Answer: a
Explanation: Landing gear is also called undercarriage. Tail dragger arrangement is inherently Unstable. Lift coefficient cannot be same as weight always. Lift to drag ratio is called aerodynamic efficiency and very important parameter for aerodynamic consideration.

15. We should always use tail dragger arrangement for every aircraft.
a) True
b) False
View Answer

Answer: b
Explanation: Tail dragger arrangement was most widely used during first 40 to 50 years of aviation. Nowadays, this arrangement is limited to general aviation aircraft. This arrangement is inherently Unstable but are lighter in weight and provides more prop clearance.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn