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