ETC ETC Hydraulics & Fluid Mechanics

Question 1

What is the standard SI unit of pressure?

Accepted Answer

Pascal (Pa)

Answer

The Pascal (Pa) is the SI unit of pressure, defined as one Newton per square meter (N/m²).

Question 2

Pascal's Law states that pressure applied to a confined, incompressible fluid is:

Accepted Answer

Transmitted equally in all directions

Answer

Pascal's Law states that pressure applied to a confined fluid is transmitted undiminished and equally in all directions throughout the fluid.

Question 3

The hydrostatic pressure at depth h in a static fluid is calculated using:

Accepted Answer

P = ρgh

Answer

Hydrostatic pressure P = ρgh, where ρ is fluid density, g is gravitational acceleration, and h is depth below the free surface.

Question 4

Specific gravity of a liquid is defined as the ratio of:

Accepted Answer

The liquid's density to the density of water at 4°C

Answer

Specific gravity is the dimensionless ratio of a substance's density to the density of fresh water (1,000 kg/m³ at 4°C).

Question 5

Which fluid property describes internal resistance to flow (shear deformation)?

Accepted Answer

Viscosity

Answer

Viscosity is the property that quantifies a fluid's resistance to shear stress and flow; high-viscosity fluids like motor oil flow more slowly than low-viscosity fluids like water.

(ETC) Engineering Technician Certification Practice Test

(ETC) Engineering Technician Certification Practice Test

ETC ETC Hydraulics & Fluid Mechanics