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