1.Passenger aircraft fly at
– troposphere
2.Ambient pressure at sea level
– 1013.25 milibars
3.Pressure decrease
– temperature decrease
4.Temperature lapse rate
– 1.98ºC at every 1000 ft
5.Bernoulli’s theorem the sum of
– potential energy, pressure energy and kinetic energy is constant
6.Mean camber line
– line equidistant from top surface and bottom surface
7.Airflow thru the convergent duct causes
– increase in velocity and decrease in pressure
8.What is angle of attack
– angle between chord line and relative airflow
9.When lift increase in an aerofoil
– centre of pressure moves forward
10.Which is true statement
– lift act at right angle of the relative air flow and weight is vertically down
11.In an aerofoil formula, co-efficient of lift is depend on
– aerofoil shape and the angle of attack
12.Transition point at the wing is
– separation of boundary layer from laminar flow to the turbulent flow
13.If a aircraft engine losses power it will
– nose pitch down
14.Induced drag varies with
a)Square of the speed
b)Inversely proportional to the square of the speed
15.All 3 axis is thru
– C of G
16.Lateral stability can be achieved by
– main plane dihedral angle
17.High aspect ratio
– decrease in induced drag
18.What instability of yaw and roll
– Dutch roll
19.Wash out
– decrease of incidence from root to wing tip
20.Vapour trail at wingtip during the flight caused by
– high pressure at the bottom wing and low pressure at the top wing which causes the vortices
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