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Fluid Machines - Interview Questions and Answers

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46. Separation of flow occurs when
A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above
Explanation:
47. Which of the following statements is correct?
A. Lower critical Reynolds number is of no practical significance in pipe flow problems.
B. Upper critical Reynolds number is significant in pipe flow problems.
C. Lower critical Reynolds number has the value 2000 in pipe flow
D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
Explanation:
48. The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D
Explanation:
49. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is
A. 0.223 R
B. 0.423 R
C. 0.577 R
D. 0.707 R
Explanation:
50. The value of friction factor 'f' for smooth pipes for Reynolds number 106 is approximately equal to
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Explanation:
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