Fluid Mechanics - Study Mode

Show All Answers

[#146] Pick out the correct statement.

Correct Answer

(B) A Newtonion fluid obeys Newton's law of cooling
(E) A forced vortex occurs when fluid rotates as a solid about an axis
(L) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

[#147] For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

(A) R

(B) R 2

(C) R 4

(D) R 0.5

Correct Answer

[#148] When a fluid flows over a solid surface, the

(A) Velocity is uniform at any cross-section

(B) Velocity gradient is zero at the solid surface

(C) Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves

(D) Velocity is not zero at the solid surface

Correct Answer

(B) Velocity gradient is zero at the solid surface

[#149] Which of the following can be used for the direct measurement of volumetric flow rate of slurry?

(A) Venturimeter

(B) Orificemeter

(C) Rotameter

(D) Pitot tube

Correct Answer

[#150] In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is

(A) The velocity of sound

(B) Dependent on its cross-sectional area

(C) Dependent on fluid viscosity

(D) Dependent on fluid density

Correct Answer

(A) The velocity of sound