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