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