E-PolyLearning

46. The pitot static tube does not measure the __________ pressure.
a. static
b. total
c. difference in static & dynamic
d. all (a), (b) and (c)
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Answer: (d).all (a), (b) and (c)

47. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.
a. Bingham
b. Newtonion
c. perfect
d. none of these
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Answer: (b).Newtonion

48. In fluid flow, cavitation is caused, if the
a. fluid velocity decreases to zero.
b. total energy decreases.
c. both (a) and (b).
d. flow pressure approaches its vapor pressure at the prevailing temperature.
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Answer: (d).flow pressure approaches its vapor pressure at the prevailing temperature.

49. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
a. 0.5
b. 1
c. 1.5
d. 2
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Answer: (d).2

50. Which of the following denotes the effect of compressibility in fluid flow ?
a. Weber number
b. Mach number
c. Euler number
d. Reynolds number
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Answer: (b).Mach number