WTMA - Wiesen Test of Mechanical Aptitude Hydraulics and Fluid Dynamics Questions and Answers

Question 1

A hydraulic lift uses two pistons.
Piston A has a surface area of 2 square inches, and Piston B has a surface area of 10 square inches.
If a force of 50 pounds is applied to Piston A, what is the maximum lifting force that can be generated by Piston B?

Accepted Answer

250 pounds

Answer

10 pounds

Answer

50 pounds

Answer

500 pounds

Question 2

In a horizontal pipe, water flows from a wider section into a narrower section. According to Bernoulli's principle, what happens to the water's speed and pressure as it enters the narrower section?

Accepted Answer

Speed increases, pressure decreases

Answer

Speed increases, pressure increases

Answer

Speed decreases, pressure increases

Answer

Speed decreases, pressure decreases

Question 3

Which of the following properties of a fluid is a measure of its internal resistance to flow?

Accepted Answer

Viscosity

Answer

Density

Answer

Buoyancy

Answer

Compressibility

Question 4

A scuba diver is 10 meters below the surface of the ocean. A second diver is 20 meters below the surface. How does the pressure on the second diver compare to the pressure on the first diver?

Accepted Answer

It is significantly greater.

Answer

It is half as much.

Answer

It is roughly the same.

Answer

It is slightly less.

Question 5

A hydraulic system is designed to be 'fail-safe', meaning a small leak should not cause an immediate and catastrophic failure. Which type of fluid would be MOST suitable for this system?

Accepted Answer

A nearly incompressible liquid (like oil)

Answer

A highly compressible gas (like air)

Answer

A fluid with very high viscosity

Answer

A fluid with very low density

Question 6

In the context of fluid dynamics, which of the following describes a smooth, orderly flow where fluid particles move in parallel layers without mixing?

Accepted Answer

Laminar flow

Answer

Turbulent flow

Answer

Compressible flow

Answer

Viscous flow