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