Quiz on Introduction to Refrigeration

What is the primary purpose of refrigeration?

• To increase the temperature of a substance

• To maintain a space at a lower temperature than the surroundings

• To generate heat from cold bodies

• To convert gases into liquids

What is the working fluid in a refrigeration system called?

• Thermal fluid

• Heat pump

• Refrigerant

• Coolant

Which law of thermodynamics is associated with the refrigeration process?

• Third law

• Zeroth law

• Second law

• First law

What is the unit of refrigeration expressed in?

• Kilowatts

• Joules

• Ton of Refrigeration (TR)

• Cubic meters

How is one ton of refrigeration defined?

• The heat required to freeze one ton of water

• The heat required to melt one ton of ice at 0oC to water at 0oC in 24 hours

• The heat required to cool one ton of air

• The heat required to heat one ton of water

What is the main difference between a refrigerator and a heat pump?

• Refrigerators are more efficient

• Heat pumps transfer heat from cold to hot bodies

• Refrigerators maintain low temperatures while heat pumps maintain high temperatures

• Heat pumps are used only in industrial applications

What does the Coefficient of Performance (COP) measure?

• The efficiency of a heating system

• The ratio of useful cooling or heating effect to work input

• The total energy consumed by a refrigeration system

• The amount of heat rejected by a heat pump

If the refrigerating effect is 200 kJ and the work input is 50 kJ, what is the COP of the refrigerator?

• 3

• 2

• 4

• 1.5

What is the relationship between the COP of a refrigerator and a heat pump?

• COPHP = COPR + 1

• COPHP = COPR x 2

• COPHP = COPR / 2

• COPHP = COPR - 1

What is the relative COP?

• The ratio of actual COP to theoretical COP

• The difference between actual and theoretical COP

• The maximum COP achievable

• The average of COP values