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