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