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