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