Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:Which of the following best describes pressure drag on a well designed aerofoil?
O a. It is equal to the skin drag after stall
O b. It is larger than the skin drag after stall
O c. It is larger than the skin drag before stall
O d. It is equal to the skin drag before stall.
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- 6. For a wing of aspect ratio AR, having an elliptical lift distribution, the induced drag coefficient is (where CL is the lift coefficient) (b) TAR CL 2TAR (d) TAR2 (a) TAR 7. Laminar flow airfoil is used to reduce the (a) pressure drag (b) induced drag (c) skin friction drag (d) wave drag 8. Set the aerofoil your chosen angle of incidence is gives a good installed pressure distribution. (a) twelve degree (b) ten degree (c) eight degree 9. The critical Mach number for a thick airfoil will be (a) lesser than a thin airfoil. (b) greater than a thin airfoil. (c) equal to a thin airfoil. (d) cannot be related to thin airfoil 10. What is the dimension for Lift coefficient? (a) N/s (b) kg/N (c) Dimensionlessarrow_forwardHow to get more accurate data for lift coefficient (Cl) and drag coefficient (Cd) compared to Foilsim?arrow_forwardFor the NACA 2412 airfoil, the lift coefficient and moment coefficient about the quarter-chord at -6° angle of attack are -0.39 and -0.045, respectively. At 4° angle of attack, these coefficients are 0.65 and -0.037, respectively. Calculate the location of the aerodynamic center. -arrow_forward
- 1. A sign is exposed to a 15 mph wind on a standard day. You may neglect the "legs" of the sign in all cases. Estimate the drag on the sign if (a) the sign is aligned lengthwise to the wind. (b) the sign is crosswise to the wind (wind perpendicular to the face of the sign). 3 m wind (part a) Tempe ASU Next Exit wind (part b) 1m 1m Configuration for part a. Configuration for part b. 1. (c) the sign is rotated by 90 degrees (so that it is 3 m high and 1 m wide) and the wind is parallel to the face of the sign. (d) the sign is rotated by 90 degrees (same orientation as in part c) and the sign is crosswise to the wind. 1m wind (part c) Tempe ASU 3 m Next Exit Configuration for part c.arrow_forwardPlease answer in detail. Thanks!arrow_forward7. A 2700-lb car is traveling @ sea level at a constant speed. Its engine is running at 4500 rev/min. and is producing 175 ft-lb of torque. It has a drivetrain efficiency of 90%, a drive axle slippage of 2%, 15-inch-radius wheels, and an overall gear reduction ratio of 3 to 1. If the car's frontal area is 21.5 ft, what is its drag coefficient?arrow_forward
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