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Fluid Mechanics and Hydraulic Systems Quiz

#1

Which property of fluids causes them to exert buoyant force?

Density
Explanation

Buoyant force is determined by the density of the fluid.

#2

What is the term for the resistance of a fluid to flow?

Viscosity
Explanation

Viscosity describes a fluid's resistance to flow.

#3

What is the formula to calculate pressure in a fluid at a certain depth?

P = ρgh
Explanation

Pressure in a fluid at a depth is calculated using the formula ρgh, where ρ is density, g is acceleration due to gravity, and h is depth.

#4

What is the term for the force per unit area exerted on an object's surface by the weight of the fluid above it?

Pressure
Explanation

Pascal-second (Pa·s) is a unit of viscosity, representing the force per unit area.

#5

What is the SI unit of flow rate?

Cubic meter per second (m³/s)
Explanation

Flow rate is measured in cubic meters per second (m³/s) in the SI system.

#6

What is the term for the pressure exerted by a fluid on the walls of its container?

Hydrostatic pressure
Explanation

Hydrostatic pressure refers to the pressure exerted by a fluid at rest.

#7

What does Pascal's law state?

The pressure of a fluid remains constant in all directions
Explanation

Pascal's law asserts that fluid pressure remains constant regardless of direction.

#8

Which equation represents Bernoulli's principle?

P₁ + ½ρv₁² = P₂ + ½ρv₂²
Explanation

The equation embodies the conservation of energy in fluid flow, as described by Bernoulli's principle.

#9

What is the coefficient of viscosity?

Force per unit velocity gradient
#10

What principle explains why an airplane's wings generate lift?

Bernoulli's principle
Explanation

It quantifies the internal friction within a fluid and is defined as force per unit velocity gradient.

#11

Which of the following is a unit of viscosity?

Pascal-second (Pa·s)
Explanation

The ideal mechanical advantage of a hydraulic system is its ability to magnify force, hence being greater than 1.

#12

Which of the following statements about laminar flow is true?

It has smooth and orderly fluid motion
Explanation

Laminar flow is characterized by smooth, predictable fluid motion.

#13

In a hydraulic system, if a small force is applied to a small piston, what happens to the force exerted by a larger piston connected to it?

It increases
Explanation

Force is amplified in a hydraulic system, resulting in an increase when transmitted to a larger piston.

#14

What is the ideal mechanical advantage of a hydraulic system?

Greater than 1
Explanation

Bernoulli's principle elucidates how differences in fluid speed and pressure result in lift, as seen in the operation of airplane wings.

#15

Which law states that the total energy of an isolated system remains constant over time?

Law of conservation of energy
Explanation

The law of conservation of energy asserts that the total energy within a system remains constant over time.

#16

In a fluid at rest, what is the pressure at a point solely dependent on?

Depth of the point
Explanation

The pressure in a fluid at rest is solely determined by the depth of the point.

#17

What phenomenon occurs when a fluid's velocity increases as it passes through a constriction due to conservation of mass?

Venturi effect
Explanation

The Venturi effect describes the increase in fluid velocity through a constriction due to conservation of mass.

#18

Which principle states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object?

Archimedes' principle
Explanation

Archimedes' principle states that the buoyant force acting on an object submerged in a fluid equals the weight of the displaced fluid.

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