Mechanical Aptitude Mechanical Aptitude Fluid Dynamics Principles 5

Question 1

An airplane wing generates lift primarily because:

Accepted Answer

Air moves faster over the curved top surface, reducing pressure there

Answer

The wing's curved upper surface causes air to speed up, which by Bernoulli's principle reduces pressure on top relative to the bottom, generating lift.

Question 2

In a pipe system, what is the purpose of a check valve?

Accepted Answer

To prevent backflow of fluid

Answer

A check valve is a one-way valve that allows fluid to flow in only one direction, automatically closing if flow tries to reverse.

Question 3

A fluid flowing through a pipe that makes a 90° bend will experience which of the following?

Accepted Answer

Additional pressure loss due to the change in flow direction

Answer

Bends, elbows, and fittings create additional losses called minor losses due to turbulence and flow separation at the direction change.

Question 4

What is the definition of 'flow rate' in a fluid system?

Accepted Answer

The volume of fluid passing a point per unit of time

Answer

Flow rate (volumetric) is the volume of fluid that passes through a cross-section per unit time, commonly expressed in gallons per minute (GPM) or liters per second.

Question 5

Which of the following describes the function of a pressure relief valve in a hydraulic circuit?

Accepted Answer

It limits maximum system pressure to protect components

Answer

A pressure relief valve opens automatically when system pressure exceeds a set limit, diverting fluid back to the reservoir to protect pumps and components.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Mechanical Aptitude Fluid Dynamics Principles 5