Hydraulic and Fluid Machines - Interview Questions | Exam2Win

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136. Capillary action is due to the

A. surface tension

B. cohesion of the liquid

C. adhesion of the liquid molecules and the molecules on the surface of a solid

D. all of the above

E. none of the above.

Explanation:

137. Pressure of the order of 10"' torr can be measured by

A. Bourdon tube

B. Pirani Gauge

C. micro-manometer

D. ionisastion gauge

E. McLeod gauge.

Explanation:

138. To avoid an interruption in the flow of a syphon, an air vessel is provided

A. at the inlet

B. at the outlet

C. at the summit

D. ay nay point between inlet and outlet

E. none of the above.

Explanation:

139. The capillary rise at 20�C in a clean glass tube of 1 mm bore containing water is ap-proximately

A. 1 mm

B. 5 mm

C. 10 mm

D. 20 mm

E. 30 mm.

Explanation:

140. . Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

A. force of adhesion

B. force of cohesion

C. force of friction

D. force of diffusion

E. none of die above.

Explanation: