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