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