NAPT Fluid Mechanics and Hydraulics 3

Question 1

Hydrostatic pressure at a given depth depends on:

Accepted Answer

Only the fluid density and depth, not the container shape

Answer

The shape of the container and fluid temperature

Answer

The total volume of fluid above the point

Answer

The surface area of the fluid at the top

Question 2

The Venturi effect describes what happens when fluid flows through a constriction in a pipe:

Accepted Answer

Velocity increases and pressure decreases

Answer

Pressure increases and velocity decreases

Answer

Both pressure and velocity increase

Answer

Velocity and pressure both remain constant

Question 3

Hydraulic power (in watts) is calculated as:

Accepted Answer

Pressure × Volume Flow Rate

Answer

Pressure × Velocity

Answer

Force × Displacement

Answer

Torque × Pipe Diameter

Question 4

A U-tube manometer is used to measure:

Accepted Answer

Pressure differences between two points

Answer

Fluid flow velocity only

Answer

Fluid temperature differences

Answer

Fluid viscosity

Question 5

Surface tension in a liquid is caused by:

Accepted Answer

Cohesive forces between liquid molecules at the surface

Answer

Gravity pulling surface molecules downward

Answer

Atmospheric pressure acting on the liquid surface

Answer

Viscous drag between the surface and air

Question 6

In a hydraulic system, if the fluid volume flow rate is 0.002 m³/s through a pipe with cross-sectional area 0.004 m², what is the average fluid velocity?

Accepted Answer

0.5 m/s

Answer

2 m/s

Answer

8 m/s

Answer

0.008 m/s

Question 7

Which principle explains why a ship made of steel can float even though steel is denser than water?

Accepted Answer

Archimedes' principle, because the ship's hull displaces a weight of water equal to or greater than the ship's weight

Answer

Bernoulli's principle, because moving water reduces pressure on the hull

Answer

Pascal's Law, because pressure is transmitted equally through water

Answer

Newton's Third Law, because the water pushes back on the hull with equal force