Fluid Dynamics

Many mechanical systems are modeled after natural processes. Which human body function is most like an open system?

Choose all answers that apply

• Respiratory System

• Circulating blood

• Excreting Sweat

• Secreting tears from ducts

Which of the following pipe fittings has the least resistance to fluid flow?

• 
• 
• 
• 

Which of the following describes an open system

• Water is the only fluid in open systems

• In open systems, the fluid is not conserved or recirculated

• Open systems are used only for hydraulic applications

Which type of system is characterized by not releasing fluids?

• Closed

• Open

• Outdoor

• Indoor

In a hydraulic system, which of the following fluids cannot be used?

• Oil

• Nitrogen gas

• flammable liquids

• water-based substance

When we use hydraulic pistons it's to keep a load in an exact position. Why might an air-driven piston be an inappropriate tool for this purpose?

• Air is weightless.

• Air is insultating.

• Air is compressible.

• Air is invisible.

A pneumatic tool is

• powered by water.

• powered by compressed gas.

• powered by recirculated fluid

• powered by supercooled fluid.

Which of the following locations identifies where the resistance to water flow is the greatest?

• Point W

• Point Y

• Between Point X and Point Y

• Between Point W and X

Why is a hydraulic system better than a pneumatic system for lifting a dump truck bed?

• Hydraulic systems are less prone to leaks

• Hydraulic systems are energy efficeint

• Hydraulic systems can provide quick changes in movement

• Hydraulic systems can handle heavy loads sustained for long periods of time

A gardener bought a larger diameter hose. What change should the gardener expect?

• Change in the viscosity of the water

• Decrease in temperature of the water

• Decrease in the velocity of the water

• Decrease in the denisty of water