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