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