M2.2 Behaviour of Fluids

What is viscosity?

• The resistance of a fluid to a change in shape or relative movement

• The speed at which a fluid flows

• The temperature at which a fluid boils

• The density of a fluid

What does viscosity denote?

• Attraction between molecules

• Opposition to flow

• Increase in temperature

• Decrease in pressure

What causes viscosity in fluids?

• External pressure

• Internal friction between molecules

• Temperature changes

• Magnetic fields

How does high viscosity affect fluid flow in pipelines?

• It makes the flow faster

• It makes the flow slower

• It has no effect

• It changes the color

What type of oils have high viscosity?

• Cold heavy oils

• Light oils

• Volatile oils

• Petroleum spirit

What is a major factor in determining the forces in fluid transport?

• Viscosity

• Temperature

• Color

• Density

How does the viscosity of liquids change with temperature?

• Increases with an increase in temperature

• Decreases with an increase in temperature

• Remains constant

• Increases and then decreases

What is fluid resistance?

• The ability of a fluid to change color

• The resistance to motion within a fluid

• The speed at which a fluid flows

• The temperature change in a fluid

What is the purpose of countersunk rivets in aircraft?

• To increase the weight of the aircraft

• To reduce fluid resistance over the airframe

• To change the color of the aircraft

• To increase the speed of the aircraft

What is the effect of using composite materials in aircraft design?

• Increases the need for riveting

• Reduces the need for riveting

• Changes the color of the aircraft

• Increases the weight of the aircraft