Refrigerants review Quiz

High temperature refrigeration is that produced by ____.

• Home heating systems.

• Air conditioning systems.

• Ice making equipment.

• Frozen food systems.

Tags

NGSS.HS-PS3-4

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

• R-12.

• R-22.

• R-134a.

• R-502.

The evaporator in a refrigeration system ____.

• reduces the boiling point of the refrigerant

• condenses the refrigerant

• absorbs heat from the product to be cooled

• compresses the refrigerant vapor

The ____ are used to change the vapor to a liquid and the liquid form back into a vapor, the refrigeration cycle.

• condenser and compressor

• compressor and expansion device

• expansion device and evaporator

• condenser and evaporator

Ice melts in iceboxes because ____.

• heat flows through the insulated walls

• heat enters when the door is opened

• heat enters when warm food is placed in the icebox

• All of the above.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

• True.

• False.

Tags

NGSS.MS-PS1-4

Good ventilation is important when working around refrigeration equipment because modern refrigerants ____.

• are toxic and can poison you

• have an unpleasant odor

• are heavier than air and may displace the oxygen around you

• Both a and c.

The discharge gas from the compressor is a high pressure, high temperature, superheated vapor.

• True

• False

Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

• True

• False

Tags

NGSS.MS-PS1-4

A ton of refrigeration is equal to ____.

• 1 ton of ice

• 288,000 Btu/24 h

• 144 Btu/h

• 12,000 Btu/min