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