List of top Mechanical Engineering Questions on Fluid Mechanics

A Newtonian fluid is defined as the fluid which

Bernoulli's theorem deals with the law of conservation of

The thickness of a laminar boundary layer at a distance \( x \) from the leading edge over a flat plate varies as

Which of the following pressure control valves is used to sense the hydraulic pressure of an external line and give a signal when it reaches some preset value

Given below are two statements one is labelled as Assertion A and the other one labelled as Reason R

Consider the following statements about the flow in a convergent-divergent nozzle operating under design conditions:

1. In the divergent section, pressure is higher than the pressure in the convergent section.
2. The pressure at the throat is equal to critical pressure.
3. The pressure in the convergent section reduces.
4. The flow is subsonic in the convergent section and supersonic in the divergent section.

Choose the correct answer from the options given below.

Given below are two statements:
Statement (A): The flow in a pipe is turbulent when the Reynolds’ Number is more than 4000.
Statement (R): The flow in a pipe is turbulent at entry and slowly changes to laminar along the length of the pipe.
In light of the above statements, choose the correct answer from the options given below:

Match List I (Non-dimensional number) with List II (It is the ratio of):

LIST I	LIST II
A. Reynold’s Number	III. Inertia force to viscous force
B. Mach Number	I. Inertia force to elastic force
C. Froude’s Number	II. Inertia force to gravity force
D. Weber’s Number	IV. Inertia force to surface tension force

Choose the correct answer from the options given below:

The vacuum in a closed container is 50 mm of Hg The absolute pressure in the container is