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Hydraulic and Fluid Machines - Interview Questions and Answers

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146. The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will
A. increase
B. remain unaffected
C. may increase or decrease depending on the characteristics of liquid
D. decrease
E. unpredictable.
Explanation:
147. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of
A. 1
B. 1.2
C. 0.8
D. 0.75
E. 1.25.
Explanation:
148. The units of dynamic or absolute viscosity are
A. metres2 per sec
B. kg sec/metre
C. newton-sec per metre
D. newton-sec2 per metre
E. none of the above.
Explanation:
149. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
A. 2.4 m above the hydraulic gradient
B. 6.4 m above the hydraulic gradient
C. 10.0 m above the hydraulic gradient
D. 5.0 above the hydraulic gradient
E. none of the above.
Explanation:
150. If the surface of liquid is convex, men
A. cohesion pressure is negligible
B. cohesion pressure is decreased
C. cohesion pressure is increased
D. there is no cohesion pressure
E. none of the above.
Explanation:
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