Refrigerants containing chlorine are said to destroy
What must you do to the power before you perform a preoperational...
Which evaporator operating condition uses air circulation to aid in...
What term refers to how hot or cold a substance is?
Which major component is considered to be the "heart" of the...
Which refrigeration compressor is equipped with pistons and connecting...
The best criteria to follow when you are inspecting equipment are
All moving parts on an air compressor should have
What is the term for a refrigeration unit to operate or cycle on?
The float assembly in an oil separator is activated by the
Which of these refrigerants has an ozone depletion rating of zero?
What must be balanced to distribute the load as equally as possible...
Two different metals that are bonded into a strip or coil are called
You are retrofitting a system that does not have a receiver. To do the...
To create the required pressure drop, the capillary tube uses a...
Where do you install a sight glass and/or moisture indicator in a...
The disadvantage of water-cooled condensers is
What device is used to prevent liquid refrigerant from entering the...
Which heat pump component prevents liquid refrigerant from entering...
The direct-expansion evaporator picks up or absorbs heat directly from...
What type of heat when added to a substance causes a measured...
How much of the refrigerant charge should a receiver hold?
What is a big problem with humidity control equipment?
On a centrifugal machine, the refrigerant flows from the first-stage...
On systems that contain over how many pounds of refrigerant is passive...
The advantage of an air-cooled condenser is
Which pressure control has contacts that open on a rise in pressure?
Which component is installed at the inlet of the evaporator?
What triggers a refrigeration unit to cycle on or off?
Temperature glide in an zeotropic refrigerant means that the...
What is the maximum fine and jail sentence that service technicians...
Heat that is picked up in the refrigeration system is rejected at the
Which processes take place inside the condenser?
Which packaged unit normally uses only one fan motor?
Which type of water-cooled condenser has removable heads that allow...
What is the line to inlet relationship of refrigerant vapor travel as...
In a multi stage air-compressor installation, what is used to remove...
Complete vaporization in an evaporator occurs at point
Which alternative replacement for R–502 is a patented azeotrope?
How does the rotary compressor compress the refrigerant vapor?
What program is designed to keep heating, ventilation,...
Where are the coldest rooms located in a permanent cold-storage plant?
During retrofitting, which component might have to be reset to...
An ice-cream cabinet is similar to a
Cleaning a refrigerant at the job site or at a local service...
When polyolester oil is used in place of mineral oil during a...
Which organization requires that a comprehensive risk assessment...
Proportionately which refrigerator has the biggest freezer...
The Environmental Protection Agency (EPA) has developed a Significant...
The thermostatic expansion valve maintains a fully active evaporator...
How is the capillary tube in a system affected by the refrigerant...
What do filter-driers not remove from a refrigeration system?
In which two parts of a refrigeration system does a pressure change...
The reciprocating refrigeration compressor is designed to remove
What type of thermostatic expansion valve has a charged sensing bulb...
In which major component does absorbed heat cause liquid refrigerant...
What prevents direct impact of refrigerant vapors on the tubing bundle...
What is the maximum percent a refillable cylinder can be refilled with...
What type of rotary compressor has the blade set into the cylinder?
Which compressor type is used with refrigerants that have a large gas...
Which evaporator type is designed to maintain an even temperature...
Which refrigerant oil is designed for use with the new ternary...
To help ensure that the proper refrigerant and lubricant will be used...
Which desiccant is the most popular and can be left in the system...
During equipment cooling, humidity cannot be added to the air by
In relation to the curve, where is the liquid refrigerant shown on the...
On a multi-evaporator system, the evaporator pressure regulating (EPR)...
Which type piston can suction gas pass through?
Air intake filters used on air compressors are designed to prevent
What is it called when two or more compressors are piped in series to...
Which type of ice-machine evaporator produces a slab of ice that is...
In relation to the curve, where does the refrigerant change of state...
Where does the compressed refrigerant vapor go during the heating...
Which cooler is used exclusively to cool liquids?
What condition must exist before using a pressure-temperature (PT)...
The receiver tanks used on air compressors are designed to be
On Type II systems, what level of evacuation in the isolated component...
R–401A is not a suitable alternative refrigerant for
What factor is not part of the known factors for using a...
You are retrofitting a system with an alternative refrigerant and you...
When manual condensate drains are installed on an air receiver tank,...
You have plotted all the points for an operating refrigeration system...
Commercial and industrial systems with leaks exceeding what percent...
What accessory is added to the cascade system to increase its...
The economizer on a centrifugal machine prevents liquid refrigerant...
What type maintenance action do you perform on operating heating,...
Which type of compressor uses an orbiting motion for compression?
The ultralow-temperature classification begins at
The hydraulic cylinder unloader mechanism is designed to unload the...
When conducting an operational check of the mechanical part of a...
Which display-cabinet defrosting method has the advantage of not being...
Which item is not an advantage of a multiple-compressor system?
When the compressor air intake is piped to the outside, it should be
A retrofitted air-conditioning system still has the original capillary...
Which pressure control is designed to cut in on a rise in pressure and...
To regulate the load on a water-cooled condenser, you should
What type of thermostatic expansion valve has a bulb that is charged...
Which of these refrigerants is colorless and has a very pronounced...
Approximately what percent of the evaporator tubing bundle is covered...
R-406a can be used to replace
You have plotted all the points for an operating refrigeration system...
The safety devices used on air compressors should be checked
Normally the temperature of the water entering the condenser on a...
R–401A and B can be described as a/an
How many air-compressor starts per hour would require a constant speed...
Which item does not indicate the cylinders are unloading when you are...
Which display-cabinet defrost method is limited to operating...
A good refrigerant oil will have
Where is the subcooler installed on a compound system?
When solenoid valves are used in the suction line of a...
During defrost, the heat pump system does not
The purge unit on a centrifugal machine is not designed to
What type of alternative is refrigerant R–402A?
In a heat exchanger, the heat that is transferred comes from the
Which type of ice-machine evaporator operates underwater?
Which type of cooler is generally used in the common water cooler?
The connecting point of a cascade system is
How is the latent heat line shown on the pressure-enthalpy (PE) chart?
Which pressure control is designed to operate from a pressure...
On what basis should you check and clean the air filters used on air...
What can be used in place of thermostats and solenoid valves to...
Air compressors with operating pressures above 200 pounds per square...
What can be used to control a single-temperature, multiple-evaporator...
Air-compressor receiver tanks should be inspected