Low/Medium Temp Refrigeration

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Question 1

Commercial case cabinets for low and medium temperatures are generally constructed of

A	Plastic
B	Fiberglass
C	Porcelain and stainless steel
D	Plastic and stainless steel

Question 2

The type of insulation used in commercial cabinets is commonly

A	Styrofoam
B	Blanket
C	Granule
D	Polystyrene or urethane

Question 3

To prevent condensation around the doors of case cabinets __________ are usually installed

A	Hot gas lines
B	Mullion heaters
C	Magnetic strips
D	Felt fabric strips

Question 4

Magnetic door gaskets are used to

A	Prevent air leakage and infiltration
B	Prevent condensation
C	Prevent ice formation
D	Prevent fogging of windows

Question 5

The display case is designed to be either

A	Chest or vertical with closed doors
B	Closed or open display type
C	Open or closed type with full viewing
D	Sliding or hinged door type

Question 6

The open display case uses a cold blanket of air that is

A	Circulated beneath the merchandise
B	Circulated over the merchandise
C	Circulated on the sides of the cabinet
D	Blown through air inlets at the corners of the cabinet

Question 7

With open display cases the evaporator is commonly installed at

A	The top of the case
B	The front section of the case
C	The sides of the case
D	The bottom and back sections of the case.

Question 8

A suitable location for an open display case would be

A	Near an air duct
B	Close to an entryway
C	Near exhaust fans
D	Away from outdoor air movement

Question 9

Evaporators used on closed display cases are usually installed

A	On the back wall or top of the unit
B	On the corner of the unit
C	On the front of the unit
D	On the bottom of the unit

Question 10

Frozen food display cases use evaporators that are of the forced-air type, and the compressors are located.

A	With the case or in a remote area
B	On rooftops only
C	In a mechanical room only
D	In areas that are remote to the outdoors

Question 11

Walk-in coolers or freezers use evaporators that are.

A	Gravity type
B	Bare-pipe type
C	Forced-air finned-and-tube type
D	Equipped with check valves

Question 12

Walk-in unit doors must have a _________ on the inside of the cabinet that will allow anyone who might be trapped to reopen the door and get out.

A	Alarm
B	Light
C	Safety latch
D	Button switch

Question 13

Some walk-in units use a fan control that will

A	Allow the evaporator fans to continually operate
B	Turn evaporator fans off during defrost mode
C	Keep evaporator fans on during defrost
D	Turn evaporator fans off once the door is opened

Question 14

The condensate pan of a walk-in unit must be piped to the outside of the cabinet, and when temperatures are kept below freezing the drain line must be heated by?

A	Hot gas discharge
B	Electric heat
C	Heat exchanger
D	Compressor downtime

Question 15

The refrigerant piping of walk-in units is constructed of

A	Steel and copper
B	Aluminum and copper
C	Hard-drawn copper and possibly with precharged lines
D	Annealed copper tubing

Question 16

The ice temperature at which ice machines operate while making ice is

A	-10 F
B	0 F
C	10 F
D	20 F

Question 17

The harvest cycle of an ice machine is initiated by

A	Thermostat control
B	Low-pressure control
C	Timer clock
D	Increase in temperature

Question 18

The ice machine that produces ice in the form of flakes uses

A	Inverted cups
B	An auger and gear motor
C	Linkage for water spray
D	Electric defrost

Question 19

Ice machines that produce ice in the form of cubes do not use

A	Inverted cups
B	Spray linkage
C	Hot gas defrost
D	Auger and gear motor

Question 20

The harvest cycle most commonly used with ice machines is done by

A	Timed shutdown
B	Electric heat
C	Hot gas
D	Hot water

Question 21

Ice machines occasionally will need cleaning and flushing out; this is accomplished with the use of

A	Safe chemicals and clean water
B	Muratic acid
C	Chlorine and water
D	Algicide treatment

Question 22

The ice machine is designed to operate where the location at ambient temperature is generally at

A	40 – 115 F
B	50 – 125 F
C	25 – 100 F
D	50 – 145 F

Question 23

Compressors of vending machines are usually rated as

A	Over 1 horsepower
B	Fractional horsepower
C	Hermetics with at least 1 horsepower
D	Semi-hermetics with potential relays

Question 24

Vending machines consist of different systems; one that is not part of a vending machine is

A	Refrigeration
B	Refilling products
C	Dispensing
D	Coin return

Question 25

Generally, the electrical cord from a vending machine should plug into an electrical outlet rated at

A	15 amps
B	20 amps
C	30 amps
D	35 amps

Question 26

Beverage coolers are designed to keep products at

A	Slightly below freezing temperatures
B	The same temperature as the evaporator
C	Above freezing temperature
D	Consistently 45F

Question 27

The evaporators of beverage coolers operate below freezing temperature; therefore the system must include a

A	Check valve
B	EPR valve
C	Defrost system
D	CPR valve

Question 28

The metering device that commonly is used on beverage coolers is the

A	Capillary tube
B	Automatic expansion valve
C	Thermostatic expansion valve
D	TXV with an external equalizer

Question 29

Beverage coolers use forced-air evaporators that generally circulate the cold air

A	From the bottom of the evaporator below the products
B	Over the top of the products and back to the evaporator
C	On sections of products at a time
D	Over the section first to be dispensed

Question 30

Beverage coolers that dispense ice into cups and prechill the entering water use

A	CPR valves
B	Automatic expansion valves
C	Two evaporators
D	Separate low-pressure controls

Question 31

Beverage coolers that refrigerate liquid and use CO2 cylinder for carbonation locate the cylinder

A	At the top of the cabinet
B	By the condensing unit
C	Behind the cabinet
D	Inside the vending machine

Question 32

Some water coolers use a large bottle that sits on top of the cooler that is then chilled. Another type dispenses chilled water through a bubbler is called the

A	Pressure type
B	Temperature type
C	Bubbler type
D	Button type

Question 33

Water coolers use compressors that are rated at

A	Fractional horsepower
B	1 hp
C	1-2 hp
D	1 hp semi-hermetic compressors

Question 34

The evaporators of water coolers are made of stainless steel, copper, or brass tanks and the refrigerant piping

A	Enters into the tank
B	Is coiled on top of the tank
C	Is coiled at the bottom of the tank
D	Is coiled around the tank

Question 35

Ultra-low refrigeration is used to fast-freeze products for commercial use with temperatures around

A	-15F
B	-25F
C	-30F
D	-50F

Question 36

With ultra-low-temperature refrigeration, when temperatures below -50F are desired, generally

A	Two-stage compression is used
B	High-side floats are used
C	Low-side floats are used
D	Multiple evaporators are used

Question 37

Cascade systems may be used to maintain temperatures lower than

A	-20F
B	-30F
C	-160F
D	-40F

Question 38

Cascade systems may be used to maintain temperatures lower than

A	-20F
B	-30F
C	-160F
D	-40F

Question 39

A popular solution used in transport refrigeration is

A	R-134a
B	R-22
C	R-502
D	Eutectic solution (brine)

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Low/Medium Temp Refrigeration

Low/Medium Temp Refrigeration

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