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Hydraulic and Fluid Machines - Interview Questions and Answers

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51. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
A. 0.5
B. 0.4
C. 0.515
D. 0.5
E. none of the above.
Explanation:
52. For pipes, laminar flow occurs when Roynolds number is
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
E. none of the above.
Explanation:
53. The upper surface of a weir over which water flows is known is
A. crest
B. nappe
C. sill
D. weir top
E. contracta.
Explanation:
54. According to Bernoulli's equation for steady ideal fluid flow
A. principle of conservation of mass holds
B. velocity and pressure are inversely proportional
C. total energy is constant throughout
D. the energy is constant along a stream-line but may vary across streamlines
E. none of the above.
Explanation:
55. The equation of continuity holds good when the flow
A. is steady
B. is one dimensional
C. velocity is uniform at all the cross sec-tions
D. all of the above
E. none of the above.
Explanation:
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