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