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Offers solutions and expertise in servicing, repairing, and maintaining refrigeration systems to ensure performance and efficiency in various industries.
Why are expansion valves adjustable?
Moisture in the system will result in
What is the definition of super heat?
A forced draft high temperature evaporator would ____.
___ is a unit of electrical power.
A gauge manifold includes a ___.
The instrument used to find refrigerant leaks in a general area is called ___.
The desired water flow through a condenser connecting to a recirculating water system is 3 gallons per minute.
The automatic expansion valve maintains a constant ____.
Why do some technicians use the reamer to clean the end of the copper tubing?
What is the most common metering device used in domestic refrigerators?
A direct expansion-type evaporator is also called a ____.
What instrument is used to measure voltage?
A large capacity evaporator would probably have ____.
___ is a unit of electromotive force.
Loose or dirty connection on a fan motor can cause ___.
Where are piercing valves installed?
Which of the following is an HFC refrigerant?
A normally operating water-cooled condenser is operating with a 10°differential between water in and water out. If scale forms on the water tubes and the entering wateris 85°F, which of the following is possible?
In a refrigerator that has capillary tube, what controls the box temperature?
___ is a unit of capacitance.
When should you push and pull on a wrench?
When the quantity of refrigerant flow to an evaporator is reduced, the amount of superheat in the vapor leaving the coil will ____.
Which of the following illustrates the principle of convection?
A forced draft medium temperature evaporator would ____.
Bimetal switches will open if ___.
In an AEV or AXV system, when does the needle valve open?
What force causes a thermal-electric expansion valve to open?
If the suction line is frosted, the trouble could be ___.
At what temperature does 95/5 soft solder melt?
What kind of compressor motor control is used on household freezers?
Heat is absorbed by evaporating a liquid refrigerant in the ___.
In a hot gas defrost system, which part of the system is heated?
At what temperature does silver solder melt?
Why should refrigerant cylniders be filled to only 80% or capacity?
If an R-12 refrigeration system is operating with a 25.4 psig suction pressure,what is the evaporator superheat if the evaporator outlet temperature is 34°F?
What indicates that correct brazing temperature has been reached?
In a water-cooled condenser, a regulating valve is used to control the____.
Evaporating pressure must be ___ so the liquid boils at the correct temperature.
In order for a flooded condenser type head pressure control system to operate, a device called a ____ has to be added to the system because of the extra refrigerant.
In a water-cooled condenser, the leaving water temperature is normally ____°F lower than the condensing temperature of the refrigerant.
What refrigerant have the greatest negative effect on the ozone?
The heat required for off-cycle defrost is obtained from ____.
Which of the following is NOT part of the low side of the system?
Low suction pressures, iced coils, short-cycling, and inefficient cooling can also result from low head pressures.
What does the sight glass in the liquid line frequently indicate?
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15psig, what is the pressure at the inlet of the evaporator?
When using nitrogen, the nitrogen tank must be equipped with ___.
A stamped plate evaporator usually does not use a fan to move air across it.
Refrigeration contaminants are removed by ___.
The start capacitor is connected in ___ with the start winding.
In most cases, the refrigerant leaving the evaporator must be ____ percent vapor.
If a spring pressure of a water regulating valve is increased, the system head pressure will also increase.
Refrigerant entering the evaporator is approximately ____% liquid.
Non-condensibles in a refrigeration system will result in
An evaporator made up of two or more pieces of sheet metal dimpled to create tubes is called a ____type.
Refrigerant fluids are ___.
When brazing a discharge filter-drier, you should always
The low form of plant life that grows in condenser water is ____.
The refrigerant in the evaporator must be colder than the air passing over it for heat to transfer to the evaporator.
When brazing a suction line using sil-flux, you should
What can be used to maintain the head pressure of a system with a water-cooledcondenser?
Evaporative condensers operate more efficiently in climates where the wet bulb temperature is a great deal lower than the dry bulb temperature.
The device that changes low pressure vapor to high pressure is called?
When evacuating a refrigeration system, the vacuum pump should be able to pull
Excess evaporator superheat ____.
A compressor motor may be operated by ___.
Which color cylinder designates R-22?
One large problem designer's face when designing air-cooled refrigeration and air conditioning equipment is a changing ambient from the changing seasons.
Thermistors are used in refrigeration work ___.
Blended refrigerant leak from a system ___.
The instrument used to measure ohms is called ___.
A normally operating water-cooled condenser is operating with a 10°differential between water in and water out. If the amount of 85°F water going through thecondenser is reduced, which of the following is a possible temperature of the water leaving thecondenser?
An air-cooled condenser that is operating in a climate that has four distinctseasons must ____.
The refrigerant in a condenser in a refrigeration system ____.
Front seating the suction service valve will close the ___.
The two primary functions of an evaporator are to remove ____ and ____ from the refrigerated space.
Why do most domestic refrigerators have a defrost system?
Control of the head pressure in an air-cooled condenser is done by ____.
A typical superheat for an evaporator operating under normal conditions would be____.
In a water-cooled condenser with dirty condenser tubes, the temperaturedifference between the refrigerant and the leaving water will be ____ when the tubes areclean.
It is said that most accidents are being caused by
If an R-12 refrigeration system has its air-cooled condensing unit on a100°F roof and the condenser outlet temperature (refrigerant) is 115°F, with how muchsubcooling is the condenser operating?
The shell and tube condenser is cleaned ____.
The water circuit in shell and coil and coil-type tube-in-a-tube condensers mustbe cleaned ____.
Back seating the suction service valve will close the ___.
Which of the following can be used to maintain the head pressure of a systemwith an air-cooled condenser?
If a high temperature evaporator is forming ice, which of the following is apossible problem?
As the evaporator load increases, an automatic expansion valve will ____ to reduce the evaporator pressure while a thermostatic expansion valve will ____ to reduce the evaporator superheat.
What leaves the refrigerant system when you purge the lines?
What could cause a compressor motor to burnout?
Identify the starting relay or relays used on hermetic compressors
In a compression refrigerator, oil buildup can cause a problem in the ___
A water regulating valve helps maintain in a system's head pressure by modulating the flow of refrigerant through the condenser.
Which of the following condensers is the most efficient?
SEER is calculated based on the total amount of ____ the system will provide over the entire season, divided by the total number ____it will consume.
The condenser in a refrigeration system ____.
Which of the following would allow a system to operate more efficiently?
What is the definition of sub-cooling?
How many different refrigerants may be recovered into the same cylinder?
What is the common color used for ground wire?
Refrigerant in a system should be disposed of by ___.
When the velocity of the air moving over an evaporator is slow, the "air film" acts as an insulator and slow the rate of heat exchange.
Mineral deposits in the water portion of a water-cooled condenser act as____.
Which of the following refrigerants are not CFCs?
The instrument used to measure current is called ___.
A defrost system that pipes the compressor discharge vapor directly to the evaporator is called a ____ type.
Heat may be transferred from one body to another by ___.
To test for shorts or grounds on the motor windings, use an ___.
The correct term for a coil using a low side float is ____.
During the defrost cycle of a forced draft low temperature evaporator, the evaporator fan would ____.
Compressor, fan and pump motors should be regularly cleaned to___.
At what temperature does sil-flux melt?
What do we use to pinpoint a refrigerant leak in the system?
Heat flows in what direction?
What instrument is used to measure the temperature?
The four most important components in a refrigeration system are:
If the application requires a coil design to operate below 32°F, there mustbe provision for ____.
The two pressures that push to close a thermostatic expansion valve are the ____ pressure and the ____ pressure.
Refrigerants can be mixed in the recovery cylinder.
If a low temperature evaporator is forming ice, which of the following is apossible problem?
A refrigeration system designed for the storage of flowers or candy isconsidered a ____ type.
Hard starting may also occur in a low ambient conditions causing low head pressures.
Which type of compressors use crankshaft seal?
The device used to feed refrigerant to multiple circuits in an evaporator is called a flow circuit.
Sensible heat is ___.
Every central split cooling system manufactured in the USA today must have a Seasonal Energy Efficiency Ratio (Seer) of at least 10.
The component that changes the low-pressure vapor to a high-pressure vapor is ___.
An evaporative condenser uses ____ and ____ as the transfer medium for system heat.
Which color cyliner designates R-134a?
The TX valve maintains a constant ____.
Fewer fins per inch on an evaporator allow more ice to build between defrost cycle.
Latent heat is ___.
What indicates an electrical failure in a door mullion heater?
Automatic expansion valve usually adjusts the ___.
After installing a new compressor, the unit should first be
High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn starve evaporators.
How many electrical terminals does a hermetic compressor motor have?
What is the purpose of a ladder diagram?
What is the advantage of a water-cooled condenser?
A hermetic system is a ___
Which of the following is a refrigerant blend?
If an air-cooled condenser's fan motor stops running, the heat pressure will ____ and the amount of subcooling will ____.
In the TEV or TXV system, when does the needle valve open?
If a low temperature evaporator is forming excess ice, which of the followingcould be a possible problem?
___ is a unit of electric current.
What is the purpose of an oil separator?
What type of valve is used to reverse the flow of refrigerant in a heat pump?
What control determines the refrigerator cabinet temperature?
Condensing temperatures in an air-cooled condensing unit can be reduced by____.
The state of the refrigerant entering the compressor is ___.
When should you install a new liquid line filter drier?
If the waterflow is reduced, the temperature difference across a condenser will____.
As a rule of thumb, the temperature of the evaporator should be about ____ °F colder than the box temperature.
What trouble may be an indication from a warm suction line?
When a system with a water-cooled condenser cycles off, the water regulatingvalve should ____.
What force causes the solenoid valve to open?
The capacity of an evaporator is affected by ____.
What is the purpose of a sight glass on a compressor?
What is the definition of a BTU?
The device that changes liquid to vapor is called?
A typical evaporator operating temperature in an air-conditioning system is____.
Normal mid-temp refrigeration temperature is approximately __ degrees.
Why is it that workers must wear goggles when operating a power grinder?
Which of the following is an HCFC refrigerant?
Refrigeration service valve wrench is used to __.
Why is it necessary to be cautious when handling contaminated refrigerant oil?
Ice formation on an evaporator is controlled by ___.
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