How Well Do You Know About Refrigeration System? Trivia Quiz
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What instrument is used to measure the temperature?
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Anemometer
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Monometer
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Thermometer
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Tachometer
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Explore the fundamentals of refrigeration systems in our trivia quiz! Test your understanding of key concepts such as heat transfer, refrigeration cycles, and the behavior of refrigerants. This quiz is perfect for students and professionals looking to assess or refresh their knowledge in thermodynamics and refrigeration engineering.
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- 2.
What is the purpose of an oil separator?
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Remove the oil from the refrigerant
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Cool the refrigerant from the compressor
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Cool the oil in the condenser
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None of the above
Correct Answer
A. Remove the oil from the refrigerantExplanation
The purpose of an oil separator is to remove the oil from the refrigerant. This is important because oil can cause damage to the compressor and other components in the refrigeration system. By separating the oil from the refrigerant, the oil can be returned to the compressor and reused, while the refrigerant can continue to cool and circulate effectively.Rate this question:
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- 3.
What control determines the refrigerator cabinet temperature?
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Motor control
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Temperature control
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Shutoff valve
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High pressure switch
Correct Answer
A. Temperature controlExplanation
The temperature control is responsible for determining the refrigerator cabinet temperature. It regulates the cooling system of the refrigerator, adjusting the temperature as needed to maintain the desired level. This control is essential in ensuring that the refrigerator maintains a consistent and appropriate temperature to keep food fresh and prevent spoilage.Rate this question:
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- 4.
The instrument used to measure ohms is called ___.
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Ammeter
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Voltmeter
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Ohmmeter
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None of the above
Correct Answer
A. OhmmeterExplanation
An ohmmeter is the instrument used to measure ohms, which is a unit of electrical resistance. An ammeter is used to measure current in amperes, while a voltmeter is used to measure voltage in volts. Therefore, the correct instrument to measure ohms specifically is an ohmmeter.Rate this question:
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- 5.
Compressor, fan and pump motors should be regularly cleaned to___.
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Remove dust
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Provide proper air circulation
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Remove lint
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All of the above
Correct Answer
A. All of the aboveExplanation
Regularly cleaning compressor, fan, and pump motors is important to remove dust, provide proper air circulation, and remove lint. Dust accumulation can hinder the performance and efficiency of the motors, while proper air circulation is necessary to prevent overheating. Additionally, lint buildup can cause blockages and reduce the motors' effectiveness. Therefore, cleaning these motors regularly ensures their optimal functioning and prevents potential issues caused by dust, lack of air circulation, and lint.Rate this question:
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- 6.
What instrument is used to measure voltage?
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Ammeter
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Ohmmeter
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Voltmeter
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All of the above
Correct Answer
A. VoltmeterExplanation
A voltmeter is used to measure voltage. It is specifically designed to measure the potential difference between two points in an electric circuit. Unlike an ammeter, which measures current, and an ohmmeter, which measures resistance, a voltmeter is used to directly measure voltage. Therefore, the correct answer is voltmeter.Rate this question:
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- 7.
The state of the refrigerant entering the compressor is ___.
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High pressure vapor
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Low pressure vapor
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Low pressure liquid
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High pressure liquid
Correct Answer
A. Low pressure vaporExplanation
The state of the refrigerant entering the compressor is low pressure vapor because the compressor is responsible for compressing the refrigerant, and it can only compress gases or vapors. Since the refrigerant is in a low pressure state, it is in a vapor form rather than a liquid.Rate this question:
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- 8.
A gauge manifold includes a ___.
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Center gauge
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High side gauge
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Low side gauge
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High side and low side gauge
Correct Answer
A. High side and low side gaugeExplanation
A gauge manifold includes both a high side gauge and a low side gauge. This means that it has the capability to measure pressure on both the high side and low side of a system. This is important in various applications, such as HVAC systems or refrigeration systems, where it is necessary to monitor and control pressure levels on different sides of the system. Having both gauges allows for a comprehensive understanding of the system's performance and helps in troubleshooting and maintenance.Rate this question:
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- 9.
What is the common color used for ground wire?
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Red
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Black
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Green
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White
Correct Answer
A. GreenExplanation
Green is the common color used for ground wire. Ground wires are used to provide a path for electrical currents to flow into the ground in the event of a fault or surge. The color green is used to easily identify and differentiate ground wires from other electrical wires. This standard color coding helps ensure safety and proper installation of electrical systems. Red, black, and white are commonly used for other purposes in electrical wiring, but green is specifically designated for ground wires.Rate this question:
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- 10.
Heat is absorbed by evaporating a liquid refrigerant in the ___.
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Compressor
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Condenser
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Evaporator
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Receiver
Correct Answer
A. EvaporatorExplanation
The correct answer is Evaporator. In a refrigeration system, heat is absorbed by evaporating a liquid refrigerant in the evaporator. The evaporator is the component where the refrigerant evaporates, absorbing heat from the surroundings and cooling the area. This process allows the refrigerant to change from a liquid to a gas, which is then compressed and condensed in the compressor and condenser respectively. The receiver is a storage tank for the refrigerant.Rate this question:
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- 11.
Refrigeration service valve wrench is used to __.
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Front sit the valve
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Back sit the valve
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Mid position the valve
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All of the above
Correct Answer
A. All of the aboveExplanation
A refrigeration service valve wrench is a versatile tool that can be used for various purposes related to the valve. It can be used to front sit the valve, meaning to position it towards the front. It can also be used to back sit the valve, which involves positioning it towards the back. Additionally, the wrench can be used to mid position the valve, which refers to placing it in the middle position. Therefore, the correct answer is "All of the above" as the wrench can be used for all these actions.Rate this question:
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- 12.
Refrigerant in a system should be disposed of by ___.
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Venting it into the air
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Bleeding off some of the charge into the air and recovering the remainder
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Using recovery/recycling equipment
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None of the above
Correct Answer
A. Using recovery/recycling equipmentExplanation
The correct answer is using recovery/recycling equipment. This is because refrigerants contain harmful substances that can contribute to ozone depletion and climate change if released into the air. Therefore, it is important to properly dispose of refrigerants by using recovery/recycling equipment, which safely captures and recycles the refrigerant for reuse or ensures its proper disposal. Venting it into the air or bleeding off some of the charge into the air is not recommended as it can have negative environmental impacts.Rate this question:
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- 13.
What could cause a compressor motor to burnout?
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Moisture in the system
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Dirt in the system
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High temperature
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All of the above
Correct Answer
A. All of the aboveExplanation
All of the above options can cause a compressor motor to burnout. Moisture in the system can lead to corrosion and damage the motor. Dirt in the system can clog the motor and cause it to overheat. High temperature can put excessive strain on the motor and cause it to overheat as well. Therefore, any combination of these factors can contribute to a compressor motor burning out.Rate this question:
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- 14.
Latent heat is ___.
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Heat that can be measured
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Heat that can be felt by touching it
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Heat that changes a substance without changing its temperature
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None of the above
Correct Answer
A. Heat that changes a substance without changing its temperatureExplanation
Latent heat refers to the heat energy absorbed or released during a phase change of a substance, such as melting, vaporization, or condensation, without causing a change in its temperature. This heat is used to break or form the intermolecular forces between particles, resulting in a change of state. It is different from sensible heat, which causes a change in temperature.Rate this question:
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- 15.
Why do some technicians use the reamer to clean the end of the copper tubing?
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To restore full wall thickness
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To remove the burrs
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Only aluminum tubing should be burred
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All of the above
Correct Answer
A. To remove the burrsExplanation
Technicians use the reamer to clean the end of the copper tubing in order to remove the burrs. Burrs are small metal projections that can form on the inside or outside of the tubing during the cutting or bending process. These burrs can obstruct the flow of fluids or cause damage to other components. By using a reamer, technicians can remove these burrs and ensure a smooth and clean surface, allowing for proper installation and functioning of the tubing.Rate this question:
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- 16.
The device that changes low pressure vapor to high pressure is called?
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Metering device
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Open-type
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Condenser
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Compressor
Correct Answer
A. CompressorExplanation
A compressor is a device that is used to increase the pressure of a low pressure vapor. It achieves this by reducing the volume of the vapor, which in turn increases its pressure. This process is essential in various applications, such as air conditioning, refrigeration, and industrial processes, where the high pressure vapor is needed for efficient operation. The other options, metering device, open-type, and condenser, do not perform the function of increasing the pressure of a low pressure vapor.Rate this question:
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- 17.
The component that changes the low-pressure vapor to a high-pressure vapor is ___.
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Condenser
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Evaporator
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Compressor
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Capillary tube
Correct Answer
A. CompressorExplanation
The compressor is the component that changes the low-pressure vapor to a high-pressure vapor. It does this by compressing the vapor, increasing its pressure and temperature. This is an essential step in the refrigeration cycle as it allows the vapor to release heat and condense into a high-pressure liquid in the condenser.Rate this question:
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- 18.
When using nitrogen, the nitrogen tank must be equipped with ___.
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An automatic shot of valve
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Low loss fitting
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A regulator
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A low pressure control
Correct Answer
A. A regulatorExplanation
A regulator is necessary when using nitrogen because it helps control the pressure of the gas being released from the tank. Without a regulator, the pressure could be too high and potentially cause damage or safety hazards. The regulator ensures that the nitrogen is released at a controlled and safe pressure for the intended application.Rate this question:
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- 19.
How many different refrigerants may be recovered into the same cylinder?
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Only two
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Only three
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Only one
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Depends on the recovery machine
Correct Answer
A. Only oneExplanation
The correct answer is "Only one." This means that only one different refrigerant can be recovered into the same cylinder. This suggests that the cylinder should not be mixed with multiple types of refrigerants, as it is only designed to hold one specific type. Mixing different refrigerants in the same cylinder could lead to contamination and potential damage to the recovery machine or the refrigerant itself. Therefore, it is recommended to use separate cylinders for each type of refrigerant to ensure proper handling and prevent any issues.Rate this question:
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- 20.
Refrigerant fluids are ___.
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Fluids that absorb heat inside a cabinet
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Fluids that release heat outside of a cabinet
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Fluids that absorb heat outside of a cabinet
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Both A and B
Correct Answer
A. Both A and BExplanation
Refrigerant fluids are both fluids that absorb heat inside a cabinet and fluids that release heat outside of a cabinet. This means that they have the ability to absorb heat from the surroundings within a cabinet, cooling the area, and also to release heat to the surroundings outside of the cabinet, dissipating the heat.Rate this question:
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- 21.
___ is a unit of electric current.
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Kilowatt
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Microfarad
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Ampere
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Volt
Correct Answer
A. AmpereExplanation
An ampere is a unit of electric current. It is named after the French mathematician and physicist André-Marie Ampère, who is considered one of the founders of electromagnetism. The ampere is defined as one coulomb of charge passing through a conductor per second. It is used to measure the flow of electric charge in a circuit and is an essential unit in electrical engineering and physics.Rate this question:
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- 22.
Why should refrigerant cylniders be filled to only 80% or capacity?
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Liquid refrigerant expands with an increase in temperature
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A cylinder completely filled liquid will burst if it warms up
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Liquid refrigerant will foam in the cylinder
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Both A and B
Correct Answer
A. Both A and BExplanation
Refrigerant cylinders should be filled to only 80% of their capacity because liquid refrigerant expands when the temperature increases. If the cylinder is completely filled with liquid and it warms up, the expanding refrigerant can cause the cylinder to burst. Therefore, filling the cylinder to only 80% capacity allows for the expansion of the refrigerant without the risk of bursting the cylinder.Rate this question:
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- 23.
The instrument used to measure current is called ___.
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Ammeter
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Ohmmeter
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Voltmeter
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Wattmeter
Correct Answer
A. AmmeterExplanation
An ammeter is used to measure the flow of electric current in a circuit. It is designed to be connected in series with the circuit, allowing the current to pass through it and display the measurement on a calibrated scale. The other options, ohmmeter, voltmeter, and wattmeter, are used to measure resistance, voltage, and power respectively, but not specifically current. Therefore, the correct answer is ammeter.Rate this question:
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- 24.
Heat flows in what direction?
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Cold to warm
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Warm to cold
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Liquid to gas
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All of the above
Correct Answer
A. Warm to coldExplanation
Heat flows from a region of higher temperature to a region of lower temperature. This is known as the second law of thermodynamics. When there is a temperature difference between two objects, heat energy will transfer from the warmer object to the cooler object until they reach thermal equilibrium. Therefore, the correct answer is "Warm to cold."Rate this question:
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- 25.
___ is a unit of capacitance.
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Kilowatt
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Microfarad
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Milliamps
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Volt
Correct Answer
A. MicrofaradExplanation
A microfarad is a unit of capacitance, which measures the ability of a capacitor to store an electric charge. It is equal to one millionth of a farad, making it a very small unit of measurement. Capacitance is an important property in electrical circuits as it determines how much charge a capacitor can store for a given voltage. Therefore, the correct answer is Microfarad.Rate this question:
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- 26.
___ is a unit of electrical power.
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Kilowatt
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Volt
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Ohm
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Ampere
Correct Answer
A. KilowattExplanation
A kilowatt is a unit of electrical power. It is commonly used to measure the rate at which electrical energy is consumed or produced. One kilowatt is equal to 1000 watts. It is frequently used in household appliances, as well as in industrial and commercial settings, to determine the amount of power needed or generated.Rate this question:
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- 27.
How many electrical terminals does a hermetic compressor motor have?
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One
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Two
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Three
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Four
Correct Answer
A. ThreeExplanation
A hermetic compressor motor typically has three electrical terminals. These terminals are used to connect the motor to an electrical power source, allowing it to operate. Each terminal serves a specific purpose, such as providing power, grounding, or controlling the motor's speed. Having three terminals ensures that the motor functions properly and safely.Rate this question:
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- 28.
When should you install a new liquid line filter drier?
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When a new compressor is installed
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When the filter is clogged
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Once a year during system maintenance
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Both A and B
Correct Answer
A. Both A and BExplanation
A new liquid line filter drier should be installed both when a new compressor is installed and when the filter is clogged. Installing a new compressor may introduce contaminants into the system, so a new filter drier is necessary to remove these contaminants and ensure the proper functioning of the system. Additionally, if the existing filter becomes clogged, it can restrict the flow of refrigerant and affect the performance of the system, so replacing it with a new filter drier is recommended in such cases.Rate this question:
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- 29.
The four most important components in a refrigeration system are:
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Compressor, Accumulator, Receiver, Evaporator
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Evaporator, Condenser, Receiver, Compressor
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Compressor, Metering Device, Condenser, Evaporator
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Metering Device, Compressor, Condenser, Filter-drier
Correct Answer
A. Compressor, Metering Device, Condenser, EvaporatorExplanation
The correct answer is Compressor, Metering Device, Condenser, Evaporator. In a refrigeration system, the compressor is responsible for compressing the refrigerant gas, raising its temperature and pressure. The metering device regulates the flow of the refrigerant into the evaporator, where it absorbs heat from the surroundings and evaporates into a gas. The condenser then removes heat from the refrigerant gas, causing it to condense back into a liquid. Finally, the evaporator transfers the heat absorbed from the surroundings to the refrigerant, completing the refrigeration cycle.Rate this question:
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- 30.
What force causes the solenoid valve to open?
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Vapor pressure
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Gravity
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An electromagnet
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A bimetal strip when heated
Correct Answer
A. An electromagnetExplanation
An electromagnet is the force that causes the solenoid valve to open. When an electric current passes through the coil of the solenoid, it creates a magnetic field that attracts a metal plunger or armature, causing it to move and open the valve. The strength of the magnetic field can be controlled by adjusting the current, allowing for precise control of the valve opening and closing.Rate this question:
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- 31.
Which color cylinder designates R-22?
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Sky blue
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White
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Light green
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Yellow
Correct Answer
A. Light greenExplanation
The light green color designates R-22.Rate this question:
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- 32.
What is the definition of a BTU?
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The amount of heat required to raise 1 lb of water 1 degree
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The total amount of heat absorbed in a change of state
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The amount of heat necessary to raise 1 lb of substance 1 degree
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The total amount of heat to be removed from a given area in a specific time
Correct Answer
A. The amount of heat required to raise 1 lb of water 1 degreeExplanation
A BTU (British Thermal Unit) is a unit of measurement used to quantify heat energy. It represents the amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit. This definition is commonly used in the field of thermodynamics to calculate and compare the amount of heat energy transferred in various processes.Rate this question:
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- 33.
Refrigerants can be mixed in the recovery cylinder.
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When you do not know what type of refrigerant you are recovering
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All the time if the refrigerant cylinder is marked
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Never
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Only when the refrigerant is going to be reused
Correct Answer
A. NeverExplanation
Refrigerants should never be mixed in the recovery cylinder. Mixing different types of refrigerants can lead to chemical reactions and create potentially dangerous and harmful substances. It is important to properly identify the type of refrigerant being recovered and handle it accordingly. Mixing refrigerants is not recommended under any circumstances to ensure safety and prevent any negative consequences.Rate this question:
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- 34.
A compressor motor may be operated by ___.
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Low pressure control
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Temperature control
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Both A and B
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None of the above
Correct Answer
A. Both A and BExplanation
A compressor motor may be operated by both low pressure control and temperature control. This means that the motor can be controlled and regulated based on both the pressure and temperature conditions. The low pressure control ensures that the motor operates within a specific pressure range, while the temperature control ensures that the motor does not overheat. By utilizing both controls, the compressor motor can maintain optimal performance and prevent any potential damage or malfunction.Rate this question:
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- 35.
What do we use to pinpoint a refrigerant leak in the system?
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Electronic and ultrasonic leak detector
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Soap solution
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Halide leak detector
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None of the above
Correct Answer
A. Soap solutionExplanation
Soap solution is used to pinpoint a refrigerant leak in the system. When the solution is applied to the suspected area, it creates bubbles if there is a leak, indicating the presence of escaping refrigerant. This method is commonly used because it is simple and cost-effective. Electronic and ultrasonic leak detectors can also be used to detect leaks, but they are more expensive and may not be as readily available. Halide leak detectors are not typically used for this purpose.Rate this question:
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- 36.
Blended refrigerant leak from a system ___.
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Only if the line breaks completely
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At a faster rate than other refrigerants
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In uneven amounts due to different vapor pressures
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At a slower rate than other refrigerants
Correct Answer
A. In uneven amounts due to different vapor pressuresExplanation
When a blended refrigerant leaks from a system, it does so in uneven amounts due to different vapor pressures. This is because blended refrigerants are made up of multiple refrigerants with different boiling points and vapor pressures. As a result, when a leak occurs, the refrigerants will escape at different rates depending on their individual properties. This can make it challenging to accurately assess and repair the leak, as the proportions of the different refrigerants may change over time.Rate this question:
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- 37.
What is the definition of super heat?
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The temperature of vapor below its boiling point as a liquid
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The temperature of vapor above its boiling point as a liquid
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The temperature of vapor below its condensing point
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None of the above
Correct Answer
A. The temperature of vapor above its boiling point as a liquidExplanation
Superheat refers to the temperature of a vapor that is above its boiling point while it is still in a liquid state. This occurs when additional heat is added to the vapor, causing it to reach a higher temperature than its boiling point. Superheating is commonly used in industrial processes to increase the efficiency of heat transfer and to prevent condensation in pipelines and heat exchangers.Rate this question:
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- 38.
Why is it that workers must wear goggles when operating a power grinder?
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To protect their eyes from flying metal particles
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To protect their eyes from the light
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To protect their eyes from the heat
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All of the above
Correct Answer
A. To protect their eyes from flying metal particlesExplanation
Workers must wear goggles when operating a power grinder to protect their eyes from flying metal particles. This is because when using a power grinder, there is a risk of metal particles being generated and flying towards the operator's face. These particles can cause serious eye injuries if they come into contact with the eyes. Wearing goggles provides a physical barrier that can prevent these particles from reaching the eyes and causing harm.Rate this question:
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- 39.
It is said that most accidents are being caused by
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Carelessness
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Lack of knowledge
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Stupidity
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None of the above
Correct Answer
A. CarelessnessExplanation
Carelessness is the most likely cause of accidents because it implies a lack of attention or consideration for safety precautions. Accidents often occur when individuals fail to take necessary precautions or disregard safety guidelines. Lack of knowledge and stupidity can contribute to accidents, but carelessness encompasses both of these factors as it suggests a disregard for safety due to negligence or inattentiveness. Therefore, carelessness is the correct answer as it encompasses a wide range of behaviors that can lead to accidents.Rate this question:
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- 40.
Which of the following illustrates the principle of convection?
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Movement of heat by fluid or air
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Heat waves from the sun
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Heat traveling through a solid object from end to end
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Radiation from the sun
Correct Answer
A. Movement of heat by fluid or airExplanation
The principle of convection is illustrated by the movement of heat through fluid or air. Convection occurs when warmer particles in a fluid or air rise, creating a flow that transfers heat from one place to another. This is commonly observed in phenomena such as boiling water, where heat is transferred from the bottom of the pot to the surface through the rising motion of the heated water.Rate this question:
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- 41.
A hermetic system is a ___
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Motor and compressor in a dome
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Compressor that is belt driven
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Direct-drive motor
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Hermetic split-phase induction motor
Correct Answer
A. Motor and compressor in a domeExplanation
A hermetic system refers to a motor and compressor that are enclosed within a dome or sealed container. This design ensures that the system is completely sealed and prevents any external contaminants from entering. The motor and compressor are both housed in the same unit, providing a compact and efficient solution. This design is commonly used in refrigeration and air conditioning systems.Rate this question:
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- 42.
Which color cyliner designates R-134a?
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Yellow
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Green
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Sky Blue
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Light green
Correct Answer
A. Sky BlueExplanation
The color cylinder that designates R-134a is Sky Blue.Rate this question:
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- 43.
When evacuating a refrigeration system, the vacuum pump should be able to pull
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A vacuum of 1000 microns
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A vacuum of 2 microns
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A vacuum of 500 microns
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A vacuum of 5 microns
Correct Answer
A. A vacuum of 500 micronsExplanation
The correct answer is a vacuum of 500 microns. When evacuating a refrigeration system, the vacuum pump should be able to pull a vacuum of 500 microns. This level of vacuum is necessary to remove any moisture and contaminants from the system, ensuring its proper functioning. A vacuum of 1000 microns is too high and may indicate a leak in the system. A vacuum of 2 or 5 microns is too low and may not be sufficient to remove all impurities.Rate this question:
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- 44.
What type of valve is used to reverse the flow of refrigerant in a heat pump?
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Suction pressure valve
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Check valve
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Thermostatic expansion valve
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4-way solenoid valve
Correct Answer
A. 4-way solenoid valveExplanation
A 4-way solenoid valve is used to reverse the flow of refrigerant in a heat pump. This valve has four ports, allowing the refrigerant to flow in different directions depending on the position of the valve. By controlling the energization of the solenoid coil, the valve can switch the flow direction, allowing the heat pump to switch between heating and cooling modes. This valve is essential in the operation of a heat pump as it controls the direction of the refrigerant flow to achieve the desired heating or cooling effect.Rate this question:
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- 45.
Loose or dirty connection on a fan motor can cause ___.
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Voltage drop
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Faster speed
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Voltage increase
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Both B and C
Correct Answer
A. Voltage dropExplanation
A loose or dirty connection on a fan motor can cause a voltage drop. This is because a loose or dirty connection can create resistance in the circuit, leading to a decrease in the voltage supplied to the fan motor. As a result, the fan motor may not receive enough voltage to operate at its intended speed or power, causing a drop in voltage.Rate this question:
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- 46.
Which of the following is a refrigerant blend?
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R-134a
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R-22
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R-409a
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R-12
Correct Answer
A. R-409aExplanation
R-409a is a refrigerant blend because it consists of a mixture of different refrigerants. It is composed of R-22, R-124, and R-142b. Refrigerant blends are commonly used in various cooling systems to achieve specific performance characteristics and to comply with environmental regulations.Rate this question:
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- 47.
Heat may be transferred from one body to another by ___.
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Radiation
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Conduction
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Convection
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All of the above
Correct Answer
A. All of the aboveExplanation
Heat can be transferred from one body to another by radiation, conduction, and convection. Radiation is the transfer of heat through electromagnetic waves, such as heat from the sun reaching the Earth. Conduction is the transfer of heat through direct contact between two objects, for example, when you touch a hot stove. Convection is the transfer of heat through the movement of fluids or gases, like the circulation of warm air in a room. Therefore, all three methods can be used to transfer heat between bodies.Rate this question:
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- 48.
Which of the following is NOT part of the low side of the system?
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Accumulator
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Evaporator
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Receiver
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Suction line
Correct Answer
A. ReceiverExplanation
The receiver is not part of the low side of the system. In a refrigeration system, the low side refers to the portion of the system where the refrigerant is in its vapor form and at a lower pressure. The accumulator, evaporator, and suction line are all components of the low side as they are involved in the vaporization and cooling process. The receiver, on the other hand, is part of the high side of the system and is responsible for storing and releasing liquid refrigerant.Rate this question:
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- 49.
The device that changes liquid to vapor is called?
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Compressor
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Condenser
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Evaporator
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Metering device
Correct Answer
A. EvaporatorExplanation
The device that changes liquid to vapor is called an evaporator. This device is commonly used in refrigeration and air conditioning systems. It works by absorbing heat from the surroundings, causing the liquid refrigerant to evaporate and turn into a gas. This phase change allows the evaporator to cool the surrounding environment.Rate this question:
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