Aircraft Design Practice Test 2

1. Determine the value for maximum camber for NACA1235 airfoil. Given chord is 1m.

0.021

0.012

0.02m

0.01m

2. Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Most of the airfoils are built with blunt trailing edge having very small finite thickness.
Reason[R]: Perfect sharp trailing edge is difficult to build.

Both [A] and [R] are true and [R] is the correct reason for [A]

[A] is false but [R] is true

[A] is true but [R] is false

Both [A] and [R] are true but [R] is not the correct reason for [A]

3. Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Most of the tails are using symmetric airfoils.
Reason[R]: Tail control has two primary control surface.

Both [A] and [R] are true but [R] is not the correct reason for [A]

Both [A] and [R] are true and [R] is the correct reason for [A]

[A] is false but [R] is true

[A] is true but [R] is false

4. Let’s consider an aircraft has statistically determined aspect ratio of 8.1. Aircraft has canard which gives contribution of 10% for total lift. Determine the aspect ratio of wing.

8.1

0.9

5. Power loading of a prop driven aircraft is defined as _________

weight of aircraft

weight of aircraft to the horsepower by prop engine

horsepower by prop engine

weight of aircraft into the horsepower by prop engine

6. Wing aspect ratio is defined as _____

span square

span square plus reference area

span square multiplied by reference area

span square divided by reference area

7. The maximum lift co-efficient for NACA 19584 (chord=2.5m) airfoil is____

0.3N

0.15N

0.315

0.15

8. For a cambered airfoil section lift is 30N. Airfoil is operating in such way that dynamic lift is 20N. Determine the lift co-efficient for the airfoil.

1.5N

0.5N

1.5

0.5

9. A jet fighter aircraft is flying with maximum Mach number of 2.0. What will be the thrust loading of the fighter?

0.64

2.5

2.0

0.57

10. The ratio of tip and root chord is called ____

aspect ratio

taper ratio

sweep

slope