View
26
Download
6
Category
Preview:
DESCRIPTION
GOOD
Citation preview
Introduction to Airplane Performance
Assignment Week 1
1. What is most likely sequence of pressure for the given figure. Ans: b
(a) A > B > C
(b) A < B < C
(c) A = B = C
(d) Cant be said
2. An aircraft is equipped with symmetrical aerofoil. For complete aircraft the lift curve slope is 5
/rad. Stall angle is 12 deg, wing area is 10 m2. What is mass during flight, whereas stall speed is
observed 90 Km/hr. g = 9.8 m/s2, density of air is 1.225 kg/m3. Ans : d
(a) 68707 kg
(b) 5301.4 kg
(c) 23438 kg
(d) 409.06 kg
3. Lift is perpendicular to: Ans : b
(a) Thrust
(b) Free-stream velocity
(c) Chord line
(d) Fuselage reference line
4. In the given figure, Xg, Xc and V are, X-axis of inertial frame, chord reference line and free
stream velocity respectively. What is the correct sequence of flight path angle, angle of attack
and pitch angle? Ans : b
(a) 3, 1, 2
(b) 2, 1, 3
(c) 1, 3, 2
(d) 2, 3, 1
5. Vortices causes: Ans : a
(a) Lift induced drag
(b) Parasite drag
(c) Skin friction drag
(d) Wave drag
6. Rudder is primarily used for: Ans : a
(a) Yaw
(b) Roll
(c) Pitch
(d) To increase drag
7. Aileron is primarily used for: Ans : b
(a) Yaw
(b) Roll
(c) Pitch
(d) To increase lift
8. Elevator is primarily used for: Ans : c
(a) Yaw
(b) Roll
(c) Pitch
(d) To increase lift
9. A typical drag-polar looks like: Ans : a
(a)
CL
CD
(b)
(c)
(d)
10. Induced drag for aerofoil is: Ans : b
(a) Infinite
(b) Zero
(c) Half of finite wing
(d) Depends upon aerofoil
CL
CD
CL
CD
CL
CD
11. For a certain angle of attack, at a given altitude, the lift will be doubled for which combination(s)
of S and V Ans : a, c, d
(a) V2, S
(b) V/2, 2S
(c) V, 2S
(d) 2V, S/2
12. For the following vs curve, which has higher aspect ratio? Ans : a
(a) Plane 1
(b) Plane 2
(c) Both have same Aspect Ratio
(d) Cant be determined
CL Plane 1
Plane 2
Recommended