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