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