Fluid Mechanics Vocab multiple Choice 4 29. What are the primary dimensions in t

Question

Fluid Mechanics Vocab multiple Choice 4

29. What are the primary dimensions in the SI (metric) system? a. N, m, and s b. kg, cm, and s c. mass, length, and time e. force, length, and time d. kg, m, and s 30. What are the primary units in the British Gravitational System? a. N, m, and s b. kg, m, and s c. lbf, ft, s d. Ibm, ft, s e. mass, length, and time f. force, length, time g. slugs, ft, s 31. What are the primary dimensions in the British Gravitational System? a. N, m, and s b. kg, m, and s c. lbf, fit, s d. Ibm, ft, s e. mass, length, and time f. force, length, time g. slugs, ft, s 32. Reynolds number is a common parameter used in evaluating fluid mechanics problems. What are the dimensions of Reynolds number? a. length b. m c. force d. lbf e, none f. pre-dimensiona g. quasi-dimensional 33. If an iterative solution to a pipe flow problem is implemented, it is likely that the unknown variable is: a. pressure drop b. volumetric flow rate c. head loss d. friction factor e. pipe length 34. Flow over an immersed body is called: a incompressible flow b. invisid flow c. internal flow d. external flow e. separated flow 35. In the graph of drag coefficient vs. Re, the drag of a dimpled sphere is always the drag of a smooth sphere: a. greater than b. less than c. equal to d. less at low Reynolds numbers than e. ess at high Reynolds numbers than 36. Streamlines are flow lines that show: a. the path of a single fluid particle b. the paths of fluid particles that pass through the same refere c. the direction of local velocity vectors d, trajectory of the flow 37. Golf balls are dimpled in order to decrease a. friction drag b. flow interference c. pressure drag d. re-laminarization e. slicing phenomenon 38. The Magnus effect is used to change the flow field over a rotating sphere by affecting the: a. skin friction distribution b, flow interference c, pressure distribution d. wake extent e. separated flow 39. Flow moves from right to left over a stationary sphere that rotates counter-clockwise. The resulting force is: a. upward b. downward c. eft d. right 40. In order to have the minimum force on a streamlined body due to frictional effects, the flow should be: a. laminar b. transitional c. turbulent d. separated e. supersonic 41. In flow over a flat plate, the shear stress created by a turbulent boundary layer is greater than that for a laminar boundary layer due to a. ow wall velocity gradient for a turbulent boundary layer b. the wall velocity gradient for a laminar boundary layer is lower c. ow flow separation for a turbulent boundary layer d. undefined flow separation for laminar boundary layers

Explanation / Answer

29)c

30)g

31)e

32)e

33)c

34)d

35)d

36)c

37)a

38)e

39)a

40)a

41)b

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