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