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