Heat & Refrigeration (Pt.2)

Multiple Choice

Which process requires more heat energy: raising the temperature of a container of water from 50°F [10°C] to 200°F [93.3°C] or boiling the same quantity of 212°F [100°C] water to 212°F [100°C] steam?

• Boiling the water requires more energy–970.3 Btu/lb [244.5 kJ/kg]. Raising the temperature of the water from 50°F [10°C] to 200°F [93.3°C] requires 150 Btu/lb [83.3 kJ/kg].

• Freezing the same quantity of 212°F [100°C] water to 32°F [0°C] ice requires more energy.

• Cooling the same quantity of 212°F [100°C] water to 50°F [10°C] requires less energy.

• Condensing the same quantity of 212°F [100°C] steam to 212°F [100°C] liquid requires more energy.

Multiple Choice

What type of heat energy, when added to or removed from a substance, results in a measurable change in temperature?

• Sensible heat

• Kinetic energy

• Radiant energy

• Latent heat

Multiple Choice

What type of heat energy, when added to or removed from a substance, results in a change of state of the substance—from a liquid to a vapor or vice-versa?

• Latent heat

• Sensible heat

• Radiant Heat

• Potential Heat