FAA Quiz - Fluid Properties

A liquid has:

• A fixed shape and no fixed volume.
• No fixed shape and no fixed volume.
• A fixed shape and a fixed volume.
• No fixed shape and a fixed volume.

The mass density of a substance is:

• Volume V of the substance per unit mass m.
• The weight of a unit volume of a substance.
• Mass m of the substance per unit volume V.
• The number of molecules per unit volume V.

250kPa is equal to:

• 253.3 atm
• 2.47 bar
• 2.5 atm
• 2.47 atm

The viscosity of a fluid is:

• The mass of the fluid per unit volume.
• A measure of the fluid’s resistance to flow.
• The force exerted by a fluid on a surface per unit area.
• A measure of the kinetic energy of the fluid molecules.

The temperature of a fluid is:

• A measure of the kinetic energy of the fluid molecules.
• A measure of the fluid’s resistance to flow.
• The force exerted by the fluid on a surface per unit area.
• A measure of the heat energy transferred to the fluid.

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The majority of gases can be considered 'ideal' at:

• Low temperature and low pressure.
• High temperature and high pressure.
• High temperature and low pressure.
• Low temperature and high pressure.

An ideal gas is one in which inter-molecular attractive forces can be neglected.

• True
• False

A fluid's viscosity is independent of temperature.

• True
• False

The units of dynamic viscosity are:

• kg/s
• kg/m³

• m²/s

• kg/ms

An aircraft is cruising at Mach 0.4. The flow over the aircraft body will be:

• Supersonic.
• Incompressible subsonic.
• Transonic.
• Compressible subsonic.