# Fluid Mechanics Multiple Choice Questions

## Fluid Mechanics

Question 1.

Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.

 A. Thermal conductivity B. Electrical conductivity C. Specific gravity D. Electrical resistivity
Explanation :

Explanation Not Provided

Question 2.

For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

 A. V/Vmax = (x/r)1/7 B. V/Vmax = (r/x)1/7 C. V/Vmax = (x.r)1/7 D. None of these
Explanation :

Explanation Not Provided

Question 3.

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

 A. D B. 1/d C. Σ D. L/σ
Explanation :

Explanation Not Provided

Question 4.

What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.

 A. 4πg/3 B. 0.01πgH/4 C. 0.01πgH/8 D. 0.04πgH/3
Explanation :

Explanation Not Provided

Question 5.

With increase in molecular weight of the gas, the head developed by a centrifugal compressor will

 A. Decrease B. Increase C. Remain same D. Unpredictable
Explanation :

Explanation Not Provided