Aircraft Design Mcqs


Final velocity at the end of the landing phase will be ____________

A) zero B) same as Approach speed
C) touchdown speed D) same as climb rate
Answer & Explanation Answer: A) zero

Explanation: Final velocity at the end of the aircraft landing phase will be zero. It is not equal to approach speed. Touchdown speed is achieved during flare segment. Rate of climb is vertical velocity of the aircraft.

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Which of the following is correct?

A) Aircraft decelerates from Approach to Touchdown speed during flare B) Lift is always same as weight
C) Drag is always same as Thrust D) Thrust loading is defined as the ratio of lift to drag
Answer & Explanation Answer: A) Aircraft decelerates from Approach to Touchdown speed during flare

Explanation: During flare aircraft will decelerates from Approach speed to touchdown speed. Lift is not always same as weight. Drag is not always same as Thrust. During cruise, lift is equal to weight and Thrust is equal to drag.

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Determine the value of FAR field length. Consider approach of 100 ft., flare of 120 feet and ground roll of 600ft.

A) 1366.12 B) 109
C) 600 D) 700
Answer & Explanation Answer: A) 1366.12

Explanation: FAR field length = 1.666*(approach + flare + ground roll)
= 1.666*(100 + 120 + 600) = 1366.12.

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Find the required average velocity during flare for military aircraft if stall speed is 45 unit.

A) 51.75 unit B) 60 unit
C) 45 unit D) 100 unit
Answer & Explanation Answer: A) 51.75 unit

Explanation: Average velocity during flare = 1.15*stall speed = 1.15*45 = 51.75 unit.

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For military aircraft touchdown speed is 100 knots then, approximate value of stall speed.

A) 90.90 B) 100
C) 200 D) 223
Answer & Explanation Answer: A) 90.90

Explanation: Stall speed = touchdown speed/1.1 = 100/1.1 = 90.90.

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If stall speed is 120 knots then, find average velocity at flare.

A) 147.6 B) 120
C) 110 D) 567
Answer & Explanation Answer: A) 147.6

Explanation: Average velocity at Flare = 1.23*stall speed = 1.23*120 = 147.6 knots.

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Find the required amount of touchdown speed if stall speed is 100knots.

A) 115 knot B) 120 knot
C) 100 knot D) 99.2 knot
Answer & Explanation Answer: A) 115 knot

Explanation: Touchdown speed = 1.15*stall speed = 1.15*100 = 115 knot.

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Find the approach speed for military aircraft. Considered stall speed is 22unit.

A) 26.4 unit B) 20 m
C) 12 ft D) 45 unit
Answer & Explanation Answer: A) 26.4 unit

Explanation: For military aircraft, Approach speed = 1.2*stall speed = 1.2*22 = 26.4 unit.

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