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