Fluid Machines - Interview Questions | Exam2Win

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86. Two pipe systems are said to be equivalent when

A. head loss and discharge are same in two systems

B. length of pipe and discharge are same in two systems

C. friction factor and length are same in two systems

D. length and diameter are same in two systems

Explanation:

87. The Prartdtl mixing length is

A. zero at the pipe wall

B. maximum at the pipe wall

C. independent of shear stress

D. none of the above

Explanation:

88. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

A. d > m > e

B. d > e > m

C. e > m > d

D. e > d > m

Explanation:

89. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

A. at the centroid of the submerged area

B. always above the centroid of the area

C. always below the centroid of the area

D. none of the above

Explanation:

90. The hydraulic grade line is

A. always above the centre line of pipe

B. never above the energy grade line

C. always sloping downward in the direction of flow

D. all of the above

Explanation: