fluid mechanics mechanical engineering MCQs – Page 3

Practise focused fluid mechanics mechanical engineering questions with marked answers for exam preparation and subject revision.

fluid mechanics mechanical engineering Mcqs
41. For hypersonic flow, the Mach number is___________________?
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A. greater than 10

B. greater than unity

C. greater than 4

D. greater than 2

E. unity

42. Increase in pressure at the outer edge of a drum of radius R due to rotation at corad/sec, full of liquid of density p will be___________________?
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A. pco2/?2/2

B. pco2/?2

C. 2pa2R2

D. none of the above

E. pa2R/2

43. Center of pressure compared to e.g. is___________________?
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A. above it

B. below it

C. none of the above

D. at same point

E. above or below depending on area of body

44. Pressure of the order of 10? torr can be measured by__________________?
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A. Pirani Gauge

B. McLeod gauge

C. micro-manometer

D. Bourdon tube

E. ionisastion gauge
45. During the opening of a valve in a pipe line, the flow is_________________?
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A. unsteady

B. free vortex type

C. laminar

D. uniform

E. steady

46. Principle of similitude forms the basis of_________________?
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A. performing acceptance tests

B. designing models so that the result can be converted to prototypes

C. hydraulic designs

D. comparing two identical equipments

E. comparing similarity between design and actual equipment

47. Poise is the unit of________________?
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A. shear stress in fluids

B. surface tension

C. buoyancy

D. capillarity

E. viscosity
48. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?
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A. 0.6

B. 0.83

C. 0.4

D. 0.3

E. none of the above

49. Working principle of dead weight pressure gauge tester is based on_______________?
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A. Daltons law of partial pressure

B. Newtons law of viscosity .

C. Pascals law

D. Avogadros hypothesis

E. Second law of thermodynamic

50. In an isothermal atmosphere, the pressure___________________?
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A. varies in the same way as the density

B. decreases linearly with elevation

C. increases exponentially with elevation

D. unpredictable

E. remains constant

51. The region between the separation streamline and the boundary surface of the solid body is known as__________________?
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A. wake

B. boundary layer

C. drag

D. aerofoil section

E. lift

52. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?
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A. 2.5 m

B. 3.0 m

C. 5.0 m

D. 2.4 m

E. 4.0 m

53. If the surface of liquid is convex, men ___________________?
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A. cohesion pressure is negligible

B. cohesion pressure is increased

C. there is no cohesion pressure

D. cohesion pressure is decreased

E. none of the above

54. Hot wire anemometer is used to measure_______________?
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A. pressure intensity of gas

B. discharge

C. pressure intensity of liquid

D. velocity of gas
55. Kinematic viscosity is equal to_________________?
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A. dynamic viscosity/density

B. dynamicviscosity x density

C. density/dynamic viscosity

D. same as dynamic viscosity

E. 1/dynamicviscosity x density

56. The atmospheric pressure with rise in altitude decreases__________________?
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A. first slowly and then steeply

B. linearly

C. unpredictable

D. first steeply and then gradually

E. none of the above

57. Which of the following instruments is used to measure flow on the application of Bernoullis theorem_________________?
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A. all of the above

B. nozzle

C. Venturimeter

D. pitot tube

E. Orifice plate

58. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?
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A. increase

B. decrease

C. unpredictable

D. may increase or decrease depending on the characteristics of liquid

E. remain unaffected

59. A pressure of 25 m of head of water is equal to_________________?
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A. 245 kN/m2

B. 2.5kN/m2

C. 12.5 kN/m2

D. 25 kN/m2

E. 2500 kN/m2

60. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
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A. 25 m/sec

B. 250 m/sec

C. 2 m/sec

D. 50 m/sec

E. 10 m/sec