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