Ctrl + F is the shortcut in your browser or operating system that allows you to find words or questions quickly.
Ctrl + Tab to move to the next tab to the right and Ctrl + Shift + Tab to move to the next tab to the left.
On a phone or tablet, tap the menu icon in the upper-right corner of the window; Select "Find in Page" to search a question.
Share UsSharing is Caring
It's the biggest motivation to help us to make the site better by sharing this to your friends or classmates.
Offers solutions and expertise in servicing, repairing, and maintaining refrigeration systems to ensure performance and efficiency in various industries.
The low form of plant life that grows in condenser water is ____.
An air-cooled condenser that is operating in a climate that has four distinctseasons must ____.
The device used to feed refrigerant to multiple circuits in an evaporator is called a flow circuit.
Identify the starting relay or relays used on hermetic compressors
What force causes the solenoid valve to open?
Which color cylinder designates R-22?
The TX valve maintains a constant ____.
The condenser in a refrigeration system ____.
As a rule of thumb, the temperature of the evaporator should be about ____ °F colder than the box temperature.
___ is a unit of capacitance.
At what temperature does silver solder melt?
At what temperature does sil-flux melt?
Bimetal switches will open if ___.
Refrigerant fluids are ___.
What instrument is used to measure voltage?
Why is it that workers must wear goggles when operating a power grinder?
Excess evaporator superheat ____.
Which of the following is NOT part of the low side of the 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?
In a hot gas defrost system, which part of the system is heated?
After installing a new compressor, the unit should first be
The two pressures that push to close a thermostatic expansion valve are the ____ pressure and the ____ pressure.
Every central split cooling system manufactured in the USA today must have a Seasonal Energy Efficiency Ratio (Seer) of at least 10.
Heat may be transferred from one body to another by ___.
A typical evaporator operating temperature in an air-conditioning system is____.
What can be used to maintain the head pressure of a system with a water-cooledcondenser?
Which type of compressors use crankshaft seal?
When should you push and pull on a wrench?
In a compression refrigerator, oil buildup can cause a problem in the ___
If the suction line is frosted, the trouble could be ___.
What force causes a thermal-electric expansion valve to open?
Evaporating pressure must be ___ so the liquid boils at the correct temperature.
What indicates that correct brazing temperature has been reached?
Which of the following illustrates the principle of convection?
A forced draft high temperature evaporator would ____.
What could cause a compressor motor to burnout?
Why do some technicians use the reamer to clean the end of the copper tubing?
When evacuating a refrigeration system, the vacuum pump should be able to pull
What is the most common metering device used in domestic refrigerators?
The refrigerant in the evaporator must be colder than the air passing over it for heat to transfer to the evaporator.
The device that changes liquid to vapor is called?
Heat flows in what direction?
Which of the following is an HFC refrigerant?
What do we use to pinpoint a refrigerant leak in the system?
Where are piercing valves installed?
The device that changes low pressure vapor to high pressure is called?
Normal mid-temp refrigeration temperature is approximately __ degrees.
The refrigerant in a condenser in a refrigeration system ____.
Which of the following would allow a system to operate more efficiently?
Hard starting may also occur in a low ambient conditions causing low head pressures.
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 water circuit in shell and coil and coil-type tube-in-a-tube condensers mustbe cleaned ____.
What instrument is used to measure the temperature?
What is the common color used for ground wire?
A refrigeration system designed for the storage of flowers or candy isconsidered a ____ type.
An evaporator made up of two or more pieces of sheet metal dimpled to create tubes is called a ____type.
The state of the refrigerant entering the compressor is ___.
Control of the head pressure in an air-cooled condenser is done by ____.
Which of the following is an HCFC refrigerant?
Refrigerant entering the evaporator is approximately ____% liquid.
Refrigeration contaminants are removed by ___.
In the TEV or TXV system, when does the needle valve open?
When the quantity of refrigerant flow to an evaporator is reduced, the amount of superheat in the vapor leaving the coil will ____.
Refrigeration service valve wrench is used to __.
What is the definition of sub-cooling?
What is the purpose of a ladder diagram?
When using nitrogen, the nitrogen tank must be equipped with ___.
Front seating the suction service valve will close the ___.
A water regulating valve helps maintain in a system's head pressure by modulating the flow of refrigerant through the condenser.
The correct term for a coil using a low side float is ____.
Non-condensibles in a refrigeration system will result in
The capacity of an evaporator is affected by ____.
Fewer fins per inch on an evaporator allow more ice to build between defrost cycle.
What is the advantage of a water-cooled condenser?
If a low temperature evaporator is forming ice, which of the following is apossible problem?
What is the purpose of an oil separator?
Mineral deposits in the water portion of a water-cooled condenser act as____.
___ is a unit of electromotive force.
One large problem designer's face when designing air-cooled refrigeration and air conditioning equipment is a changing ambient from the changing seasons.
How many different refrigerants may be recovered into the same cylinder?
The instrument used to measure current is called ___.
The two primary functions of an evaporator are to remove ____ and ____ from the refrigerated space.
What is the definition of a BTU?
Refrigerants can be mixed in the recovery cylinder.
A defrost system that pipes the compressor discharge vapor directly to the evaporator 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.
The instrument used to measure ohms is called ___.
Loose or dirty connection on a fan motor can cause ___.
How many electrical terminals does a hermetic compressor motor have?
Heat is absorbed by evaporating a liquid refrigerant in the ___.
Back seating the suction service valve will close the ___.
Automatic expansion valve usually adjusts the ___.
When should you install a new liquid line filter drier?
When a system with a water-cooled condenser cycles off, the water regulatingvalve should ____.
A hermetic system is a ___
In a refrigerator that has capillary tube, what controls the box temperature?
Why should refrigerant cylniders be filled to only 80% or capacity?
In a water-cooled condenser, a regulating valve is used to control the____.
It is said that most accidents are being caused by
In most cases, the refrigerant leaving the evaporator must be ____ percent vapor.
___ is a unit of electrical power.
What does the sight glass in the liquid line frequently indicate?
If a low temperature evaporator is forming excess ice, which of the followingcould be a possible problem?
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.
A large capacity evaporator would probably have ____.
Why do most domestic refrigerators have a defrost system?
What is the purpose of a sight glass on a compressor?
At what temperature does 95/5 soft solder melt?
A gauge manifold includes a ___.
A compressor motor may be operated by ___.
A forced draft medium temperature evaporator would ____.
A typical superheat for an evaporator operating under normal conditions would be____.
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?
What indicates an electrical failure in a door mullion heater?
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.
The start capacitor is connected in ___ with the start winding.
An evaporative condenser uses ____ and ____ as the transfer medium for system heat.
When brazing a suction line using sil-flux, you should
Condensing temperatures in an air-cooled condensing unit can be reduced by____.
Which of the following can be used to maintain the head pressure of a systemwith an air-cooled condenser?
Refrigerant in a system should be disposed of by ___.
If the application requires a coil design to operate below 32°F, there mustbe provision for ____.
Thermistors are used in refrigeration work ___.
Low suction pressures, iced coils, short-cycling, and inefficient cooling can also result from low head pressures.
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?
Which of the following is a refrigerant blend?
Moisture in the system will result in
A stamped plate evaporator usually does not use a fan to move air across it.
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.
To test for shorts or grounds on the motor windings, use an ___.
What kind of compressor motor control is used on household freezers?
When brazing a discharge filter-drier, you should always
Latent heat is ___.
In an AEV or AXV system, when does the needle valve open?
The heat required for off-cycle defrost is obtained from ____.
High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn starve evaporators.
What type of valve is used to reverse the flow of refrigerant in a heat pump?
The instrument used to find refrigerant leaks in a general area is called ___.
In a water-cooled condenser, the leaving water temperature is normally ____°F lower than the condensing temperature of the refrigerant.
The component that changes the low-pressure vapor to a high-pressure vapor is ___.
If an air-cooled condenser's fan motor stops running, the heat pressure will ____ and the amount of subcooling will ____.
What leaves the refrigerant system when you purge the lines?
If a spring pressure of a water regulating valve is increased, the system head pressure will also increase.
What trouble may be an indication from a warm suction line?
If a high temperature evaporator is forming ice, which of the following is apossible problem?
If the waterflow is reduced, the temperature difference across a condenser will____.
Which of the following refrigerants are not CFCs?
___ is a unit of electric current.
Blended refrigerant leak from a system ___.
During the defrost cycle of a forced draft low temperature evaporator, the evaporator fan would ____.
The automatic expansion valve maintains a constant ____.
Sensible heat is ___.
The shell and tube condenser is cleaned ____.
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?
Ice formation on an evaporator is controlled by ___.
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 is the definition of super heat?
Why is it necessary to be cautious when handling contaminated refrigerant oil?
The desired water flow through a condenser connecting to a recirculating water system is 3 gallons per minute.
The four most important components in a refrigeration system are:
Which of the following condensers is the most efficient?
A direct expansion-type evaporator is also called a ____.
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?
What refrigerant have the greatest negative effect on the ozone?
Why are expansion valves adjustable?
Compressor, fan and pump motors should be regularly cleaned to___.
What control determines the refrigerator cabinet temperature?
To keep up this site, we need your assistance. A little gift will help us alot.
Donate- The more you give the more you receive.
Related SubjectAir Conditioning and Refrigeration Service
Heating, Ventilation, Air Conditioning and Refrigeration
TikTok Resumes Service in the United States
Kamala Harris: Insights into the Vice President’s Life and Work
Public Service
Hospitality Management
Hotel Management
Food Service Management
Credit and Collection
Software Development
Maintenance Technology
Industrial Electronics Maintenance
Computer Support Technician
System Analysis Design and Development
Property Management System
Information Systems Operations and Maintenance
Software Engineering 2
Driver Device
Network Administration
Electronics Engineering Technology
Data Communications and Networking
Data Communications and Networking 3
Fine Arts
Nursing Interventions: Ineffective Breathing Pattern
Respiratory Care Science
Kitchen and Bath Specialty
Shopee Cashback Voucher
Temu $0 Shipping Fee
Amazon 75% Off Discounts