HVAC Unlimited Test Prep 2 of 2

Enthalpy is the total amount of _________ contained in the air above 0 degrees F.

• ice
• heat
• fog
• humidity

The centigrade scale is now referred to as Celsius.

• T
• F

Absolute temperatures are measured from absolute zero.

• T
• F

At a constant temperature, as the absolute temperature of a perfect gas varies, its absolute pressure will vary indirectly.

• T
• F

Psychrometry is the science and practice of air mixtures and their control.

• T
• F

Absolute zero is the point at which there is no heat.

• T
• F

A barometer is used to measure the compressor’s pressure.

• T
• F

All devices that measure pressure must be exposed to two pressures. The measurement is always the difference between two pressures, such as gauge pressure and atmospheric pressure

• T
• F

Pressures that include atmospheric pressure are designated pounds per square inch absolute or psia.

• T
• F

A mercury manometer is an accurate instrument for measuring pressure.

• T
• F