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