Fluid Mechanics Vocab multiple Choice 5 42. The drag component that is most sign

Question

Fluid Mechanics Vocab multiple Choice 5

42. The drag component that is most significant on a streamlined body is a. pressure b. gravitational c. friction d. inviscid e. incompressible 43. The component of drag that is most significant on a blunt body is a. pressure b. friction c. viscous d. Compressible e. gravitational 44. Optimum body profiles (sstreamlined bodies) for automobiles are not manufactured, mainly due to consumer's concern about: a. weight optimization b. esthetics c. owered fuel economy d. politics e. retooling costs 45. Devices to control flow over tractor-trailers do not include: a. flow deflectors b. gap seals c. rotating ground boards d. wake reduction devices e. streamlining of trailers 46. If the flow is from left to right, the object with the lowest pressure drag is a. disk with concave surface facing upstream similar to flow into the inside of a cup) b. disk with convex surface facing upstream c. flat disk d. disk with convex surface facing downstream 47. As the angular velocity of a cylinder decreases, the resultant Magnus force generally: a. decreases b, increases c. remains constant 48. A streamlined trailer (of a tractor-trailer rig) is impractical, mainly due to a) pressure drag increase b) friction drag increase c) decreased fuel economy d) decreased payload capacity e) esthetics 49. A knuckle ball (pitched baseball) has the observed effect due primarily to: a. wake far downstream of the ball alternates between laminar and turbulent flow b. shear stress alternates between laminar and turbulent values c. pressure profile effects due to alternating laminar and turbulent flow d. zero angular velocity 50. A symmetric airfoil at zero angle-of-attack cannot produce: a. drag b lift c.thrust d. weight e. kinetic energy f. turbulent flow

Explanation / Answer

42) c. friction

43) a. pressure

44) a. weight optimization

45) c. rotating ground board

46) a. disk with concave surface facing upstream

47) a. decreases

48) a. pressure drag increase

49) c.pressure profile effects due to alternating laminar and turbulent flow.

50) b. lift

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