Mechanical Aptitude Fluid Dynamics Principles Questions and Answers 3

Question 1

What happens to the boiling point of water as altitude increases?

Accepted Answer

It decreases

Answer

At higher altitudes, atmospheric pressure is lower, which reduces the boiling point of water. At sea level water boils at 100°C (212°F), but at high elevations it boils at a lower temperature because less pressure is needed to allow molecules to escape as vapor.

Question 2

Pascal's law states that pressure applied to a confined fluid is transmitted:

Accepted Answer

Equally in all directions

Answer

Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished and equally in all directions throughout the fluid. This principle is the foundation of hydraulic systems.

Question 3

What is the primary factor that causes water to rise in a narrow tube through capillary action?

Accepted Answer

Surface tension

Answer

Capillary action is primarily caused by surface tension (cohesion between water molecules) combined with adhesion between the water and tube walls. The adhesive forces pull water up the tube walls, and surface tension keeps the water column connected.

Question 4

What does a manometer measure?

Accepted Answer

Pressure difference

Answer

A manometer measures the pressure difference between two points, often between a system and the atmosphere. It typically uses a column of liquid (like mercury or water) whose height difference indicates the pressure differential.

Question 5

Which of the following best describes the concept of fluid head?

Accepted Answer

The energy of a fluid expressed as height

Answer

Fluid head represents the energy contained in a fluid expressed as an equivalent height of a fluid column. It combines pressure head, velocity head, and elevation head, and is used in pump and pipe system calculations.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Fluid Dynamics Principles Questions and Answers 3