Quiz 3

Reciprocation compressors have _____. a. a piston and cylinder b. two scrolls that mesh together c. a rotor to compress the refrigerant d. a large fan compressor component

a. a piston and cylinder

When a refrigerant enters the compressor, it is a ____ and when it leaves the compressor, it is a _____. a. low pressure low temperature super-heated vapor, high pressure high temperature super-heated vapor. b. low pressure low temperature super-heated vapor, low pressure low temperature sub-cooled vapor. c. high pressure super vapor, low pressure super-heated vapor. d. low pressure low temperature sub-cooled liquid, high pressure thigh temperatue super-heated vapor.

a. low pressure low temperature super-heated vapor, high pressure high temperature super-heated vapor.

The condenser ____. a. reject the heat from the refrigerant b. controls the refrigerant flow throughout the system c. adds superheat to the refrigerant d. all of the above

a. reject the heat from the refrigerant

A ton of refrigeration is equal to ____. a. 1 ton of ice b. 288,000 Btu/24-hr c. 144 Btu/hr d. 12,000 Btu/min

b. 288,000 Btu/ 24-hr

High temperature refrigeration is that produced by____. a. heat from a furnace b. an air-conditioning system c. the vegetable cooling system of a refrigerator d. the freezer section of a refrigerator

b. an air-conditioning system

The pressure in a refrigeration system is changed in the _____. a. condenser and compressor b. compressor and expansion device c. expansion device and evaporator d. condenser and evaporator

b. compressor and expansion device

At what location or locations in a refrigeration system does the saturation pressure correspond to the saturation temperature? a. compressor and evaporator b. evaporator and condenser c. condenser and expansion device d. compressor

b. evaporator and condenser

The compressor in a refrigeration system _____. a. raises the boiling point of the refrigerant b. pumps the refrigerant throughout the system c. both a and b d. none of the above

b. pumps the refrigerant throughout the system

What happens when room temperature soda is poured into a glass of ice? a. The ice gets colder. b. The ice melts because it is giving up the "cold" to the soda. c. The ice melts because it is absorbing heat form the soda. d. The ice melts because the soda is colder than the ice.

c. The ice melts because it is absorbing heat form the soda.

The evaporator in a refrigeration system _____. a. reduces the boiling point of the refrigerant b. condenses the refrigerant c. absorbs heat from the product to be cooled d. compresses the refrigerant vapor

c. absorbs heat from the product to be cooled

Good ventilation is important when working around refrigeration equipment because modern refrigerants _____. a. are toxic and can poison you b. have unpleasant odor c. are heavier than air and may displaced the oxygen around you d. both a and c

c. are heavier than air and may displaced the oxygen around you

Refrigeration can be described as _____. a. the process of making products cold b. the process of introducing heat to a location where is not wanted c. the process of removing heat from a place where it is not wanted to a place where it makes little or no difference d. none of the above

c. the process of removing heat from a place where it is not wanted to a place where it makes little or no difference

Ice melts in iceboxes because ____. a. Heat flows through the insulated walls. b. Heat enters when the door is opened. c. Heat enters when the warm food is placed in the icebox. d. All of the above

d. All of the above

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure? a. R-12 b. R-22 c. R-134a d. R-502

d. R-502

The law requires technicians to recover refrigerant from all refrigeration systems to that they ____. a. Will not be released into the atmosphere. b. may be used again. c. may be reclaimed for future use d. all of the above

d. all of the above

The refrigerant in a refrigeration system changes state in the ____. a. condenser and compressor b. compressor and expansion device c. expansion device and evaporator d. condenser and evaporator

d. condenser and evaporator