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