WorksheetsВопросы по методам охлаждения
Total questions: 98
Worksheet time: 49mins
Which of the following statements is true regarding ancient food storage methods?
Food was stored in refrigerators.
Food was stored in caves.
Food was stored in chemical solutions.
Food was stored in vacuum packaging.
When was ice artificially created for the first time?
In 1820.
In 1920.
In 1720.
In 2020.
What is required to cool a building?
Only mechanical equipment.
Only electrical equipment.
Mechanical, electrical, and lighting equipment.
Only chemical equipment.
What is one of the first steps towards artificial cooling methods?
Discovery of chemical cooling.
Invention of electrical equipment.
Use of ancient caves.
Development of vacuum technologies.
Why is cooling especially important in southern countries?
Due to high humidity.
Due to high temperature.
Due to low temperature.
Due to lack of electricity.
What material is the best insulating material for a domestic refrigerator?
Vacuum
Plastic
Metal
Wood
What is the main application of refrigerators in the last two hundred years?
Preservation of food
Air cooling
Ice production
Storage of chemicals
What substances can exist in all three states under certain conditions?
Chemical substances
Metals
Gaseous substances
Solid substances
Where did the Persians store ice?
In pits called yakchals
In wooden containers
In metal tanks
In glass jars
Who invented the first refrigeration machine?
Oliver Evans
Carl von Linden
Jacob Perkins
Thomas Edison
What process did Carl von Linden patent in 1876, which is part of cooling technology?
Gas liquefaction
Use of ether
Air compression
Freezing water
What material was used in the first practical refrigeration machine by Jacob Perkins?
Ether
Water
Ammonia
Salt
What are the two main sources of energy used in cooling systems?
Mechanical and thermal energy
Electrical and solar energy
Chemical and nuclear energy
Hydraulic and thermal energy
When was the first refrigerator for home use invented?
1803
1876
1834
1900
What material did ancient cultures use to store snow and ice?
Straw
Wood
Metal
Stone
What were the pits called where the Persians stored ice?
Refrigerators
Yakhchals
Ice houses
Caves
Who was known as the "Ice King" for developing the ice trade in the tropics?
William Cullen
Frederick Tudor
Jacob Perkins
Oliver Evans
Which scientist first developed a small refrigeration machine in 1755?
Jacob Perkins
William Cullen
Oliver Evans
Frederick Tudor
What process did William Cullen use to create ice in his experimental refrigeration machine?
Compression of air
Vacuum over diethyl ether
Freezing water
Use of ammonia
Who described the closed cycle steam compression for ice production in 1805?
William Cullen
Jacob Perkins
Oliver Evans
Frederick Tudor
What type of cycle was used in the first practical refrigeration machine by Jacob Perkins?
Open cycle
Closed cycle
Chemical cycle
Thermal cycle
How did ancient people preserve their food?
Used straw and ice pits
Stored in refrigerators
Frozen in freezers
Used chemical substances
Where did the Persians store ice?
In refrigerators
In pits covered with straw
In special containers
In ice caves
In which century was the chemical cooling system discovered?
In the 17th century
In the 18th century
In the 19th century
In the 20th century
What did Carl von Linde patent in 1876?
Method of freezing water
Method of gas liquefaction
Chemical cooling system
Refrigerator for home use
Image of the steam compression system developed by John Gorrie.
John Gorrie's steam compression system
Diagram of an internal combustion engine
Image of a steam turbine
Diagram of an ammonia refrigerator
Which three American corporations conducted joint research to develop a less hazardous cooling method, leading to the discovery of freon?
General Electric, Whirlpool, Maytag
DuPont, General Motors, Frigidaire
Samsung, LG, Bosch
Siemens, Electrolux, Haier
What invention became an important part of kitchen furniture in the 1920s?
Ice wagon
Ice box
Refrigerator
Air conditioner
What material was used for insulating ice boxes in the late 19th century?
Plastic
Wood shavings and seaweed
Metal and glass
Cardboard and fabric
How many mechanical refrigerators were produced in 1921?
1,000
5,000
10,000
50,000
What social change occurred due to the advent of household refrigerators?
People started cooking at home more often
People stopped relying on ice delivery
People began using ice boxes
People started buying frozen products more often
What is heat in the context of the nature of matter?
Heat is a form of energy contained in every substance.
Heat is a form of molecular energy that arises from the movement of atoms.
Heat is the process of transferring energy from one object to another.
Heat is a state of matter in the form of gas.
What are the three states of matter that exist in nature?
Solid, liquid, gas.
Solid, liquid, plasma.
Liquid, gas, plasma.
Solid, plasma, vapor.
How does the molecular activity of a substance change when heat is added?
Molecular activity decreases.
Molecular activity remains unchanged.
Molecular activity increases.
Molecules stop moving.
What happens to water when heat is added?
Water turns into ice.
Water turns into steam.
Water remains liquid.
Water becomes a solid substance.
Image showing the process of heat transfer from a high-temperature object to a low-temperature object.
Heat transfer from a hot object to a cold one
Light transfer from a cold object to a hot one
Electricity transfer from a hot object to a cold one
Sound transfer from a hot object to a cold one
What state of matter is formed after the process of evaporation?
Solid
Liquid
Gaseous
Plasma
What happens to heat when it is transferred from one body to another?
It disappears
It is converted into matter
It is transferred or converted into another form of energy
It becomes cold
What is the unit of measurement for heat required to raise the temperature of one pound of water by 1°F?
Calorie
Joule
British thermal unit (Btu)
Watt
How many Btu are required to raise the temperature of two pounds of water from 35°F to 165°F?
130 Btu
260 Btu
165 Btu
35 Btu
What determines the temperature of a substance in the theory of heat?
Number of molecules of the substance
Speed of the molecules of the substance
Mass of the substance
Volume of the substance
What is the unit of heat in the metric system?
Joule
Calorie
Watt
British thermal unit (Btu)
What is heat?
Energy that is transferred from a body with a higher temperature to a body with a lower temperature.
Energy that always remains in one state.
Energy that cannot be transferred between bodies.
Energy that exists only in solid substances.
What are the three methods of heat transfer?
Convection, radiation, and evaporation.
Convection, radiation, and conduction.
Conduction, evaporation, and melting.
Radiation, melting, and evaporation.
What is required for heat transfer between two bodies?
Difference in the mass of the bodies.
Difference in the temperature of the bodies.
Difference in the volume of the bodies.
Difference in the density of the bodies.
How is heat transferred by convection?
Through electromagnetic waves.
Through the movement of liquids or gases.
Through direct contact of solid bodies.
Through the evaporation of water.
How is heat transferred by radiation?
Through the movement of liquids or gases.
Through direct contact of solid bodies.
Through electromagnetic waves.
Through the evaporation of water.
What substance, in certain combinations, forms sugar and in others — alcohol?
Carbon dioxide and hydrochloric acid
Water vapor and oxygen
Nitrogen and methane
Helium and hydrogen
In what three states can a substance exist?
Solid, liquid, gas
Solid, liquid, plasma
Liquid, gas, plasma
Solid, plasma, gas
What happens to air when it is heated?
It expands and becomes lighter
It contracts and becomes heavier
It remains unchanged
It turns into a liquid
What unit of measurement for heat is used?
British Thermal Unit (BTU)
Joule
Calorie
Watt
What are the three modes of heat transfer?
Radiation, conduction, convection
Conduction, evaporation, convection
Radiation, evaporation, conduction
Convection, evaporation, radiation
What is calibration?
The process of establishing a connection between a measuring instrument and units of measurement
The process of measuring temperature
The process of transferring heat
The process of cooling a substance
Which component of the cooling system is used to reduce the refrigerant pressure?
Expansion valve
Heat exchanger
Compressor piston
Suction line
What is the name of the device that removes heat from hot compressed gas?
Expansion valve
Heat exchanger
Compressor piston
Suction line
Which component of the cooling system is used to remove unwanted heat from the product?
Expansion valve
Heat exchanger
Evaporator
Suction line
What is the process called in which the liquid refrigerant is pumped into the evaporator?
Expansion
Pumping
Compression
Heat removal
Which component of the cooling system converts low-temperature vapor into high-temperature vapor?
Expansion valve
Heat exchanger
Recirculating compressor
Suction line
What are the two main types of evaporators in cooling systems?
Dry and flooded.
Air and water.
Subcooled and heated.
Compression and expansion.
What action is referred to as "centrifugal force" in centrifugal compressors?
Movement of vapor into the compressor.
Movement of vapor outward in a circular path.
Reduction of pressure in a small diameter tube.
Increase in refrigerant temperature.
What heat does the condenser dissipate in the cooling system?
Only latent heat.
Only sensible heat.
Sensible and latent heat.
Heat released only by the compressor.
What property of pressure and temperature is used to control the temperature in the cooling system?
Dependence between pressure and boiling temperature.
Dependence between volume and temperature.
Dependence between speed and pressure.
Dependence between mass and temperature.
What are ribbed evaporators used for?
For cooling water.
For air cooling.
For heating air.
For increasing the refrigerant pressure.
What are the main components of a cooling system?
Condenser, compressor, evaporator, expansion valve, refrigerant
Condenser, compressor, evaporator, pump, water
Compressor, evaporator, expansion valve, air
Condenser, pump, expansion valve, refrigerant
What is the main function of the evaporator in a cooling system?
Removal of unwanted heat from the product using a liquid refrigerant
Compression of the refrigerant to increase pressure
Condensation of the refrigerant to convert it into a liquid
Expansion of the refrigerant to decrease pressure
What factors determine the pressure level in the evaporator?
Heat absorption rate and vapor removal rate
Ambient temperature and refrigerant flow rate
Type of refrigerant and size of the evaporator
Pressure in the compressor and condensation rate
What condition is necessary for heat transfer by a liquid refrigerant?
The temperature of the refrigerant must be higher than the temperature of the product being cooled.
The temperature of the refrigerant must be lower than the temperature of the product being cooled.
The temperature of the refrigerant must be equal to the temperature of the product being cooled.
The temperature of the refrigerant does not affect heat transfer.
What form does the liquid refrigerant take when it exits the evaporator?
Liquid.
Gaseous.
Solid.
Plasma.
What is the main function of the compressor in a cooling system?
Reducing the refrigerant pressure.
Increasing the temperature and pressure of the refrigerant.
Cooling the refrigerant.
Extracting heat from the air.
Where is the capacitor usually installed in a cooling system?
Inside the building.
On the roof of the building.
Underground.
Near the evaporator.
What temperature is required to start condensation in a condenser?
Between -12°C and -1°C.
Between 0°C and 10°C.
Between -20°C and -10°C.
Between 5°C and 15°C.
What happens to the pressure and temperature of the refrigerant when passing through the expansion valve?
Pressure and temperature increase.
Pressure decreases, and temperature increases.
Pressure and temperature decrease.
Pressure increases, and temperature decreases.
What substances were traditionally used as refrigerants but are gradually being phased out?
Ammonia and methane.
Fluorocarbons.
Carbon dioxide and sulfur gas.
Non-halogenated hydrocarbons.
What function do metering devices perform in a cooling system?
Increase the refrigerant pressure.
Reduce the refrigerant pressure and temperature.
Increase the refrigerant flow.
Change the refrigerant from a liquid state to a gaseous state.
What are the three types of dosing devices?
Needle valve, diaphragm, expansion valve.
Condenser, evaporator, compressor.
Expansion valve, thermostatic valve, capillary tube.
Refrigerant, cooling liquid, heat exchanger.
What is a capillary tube?
A device for maintaining constant pressure in the evaporator.
A device for maintaining constant superheat in the evaporator.
A device with a fixed diameter that does not respond to load changes.
A device for regulating pressure in the condenser.
What is the function of the automatic expansion valve?
Maintaining a constant superheat in the evaporator.
Maintaining a constant pressure in the evaporator.
Regulating the pressure in the condenser.
Absorbing heat from the internal volume of the refrigerator.
What are the main components of a steam compression system?
Compressor, evaporator, condenser, thermostatic expansion valve, refrigerant.
Compressor, thermostat, condenser, refrigerant.
Evaporator, condenser, thermostat, refrigerant.
Compressor, evaporator, thermostat, expansion valve.
What is the role of the thermostatic expansion valve?
Absorbing heat from the internal volume of the refrigerator.
Maintaining a constant superheat in the evaporator.
Releasing heat to the environment.
Creating the necessary pressure difference.
What are the main factors that influence the power of a compressor?
Mechanical design and application
Type of coolant and ambient temperature
Size of the compressor and its weight
Type of engine and its power
What mechanism is used in a rotary screw compressor for gas compression?
Piston mechanism
Positive displacement rotary mechanism
Turbine mechanism
Centrifugal mechanism
What is the purpose of oil in oil-filled rotary screw compressors?
To increase the gas pressure
For cooling and sealing the gas charge
To accelerate the rotation of the rotors
To reduce the noise of the compressor
What elements are used in the mechanism of a rotary screw compressor for gas compression?
Pistons and cylinders
Rotating blades
Interconnected screw elements
Turbines
Where are rotary screw compressors usually used?
In household refrigerators
In construction equipment and industry
In air conditioning systems
In automotive engines
What is the main purpose of the compressor in a mechanical refrigeration system?
Extracting liquid refrigerant from the evaporator.
Lowering the refrigerant temperature to the freezing point.
Compressing gaseous refrigerant to increase pressure and temperature.
Removing moisture from the refrigerant.
Which types of compressors are classified as piston compressors?
Screw compressor and turbo compressor.
Open, semi-hermetic, and fully hermetic compressors.
Rotary compressor and scroll compressor.
Wankel compressor and rotary vane compressor.
Which compressor is most commonly used in air conditioning systems?
Turbo compressor.
Scroll compressor.
Piston compressor.
Spiral compressor.
What does the term "open compressor" mean?
Compressor with an open piston.
Compressor connected to the drive via an external link.
Compressor operating at low pressure.
Compressor using a turbine to compress gas.
What is the main component that drives a piston compressor?
Electric motor
Piston
Crankshaft
Combustion chamber
What type of compressor is used for creating a vacuum and cooling air?
Piston compressor
Scroll compressor
Rotary compressor
Centrifugal compressor
What pressure can a piston compressor reach in industrial applications?
Up to 1000 psi
Up to 6000 psi
Up to 3000 psi
Up to 2000 psi
What is the name of the device that operates in the reverse direction of a spiral compressor?
Spiral pump
Spiral expander
Rotary expander
Vacuum pump
What is the maximum pressure that standard oil-filled compressors can reach?
150 psig
200 psig
250 psig
100 psig
In which applications are oil-free compressors used?
In automotive engines
In medical research and semiconductor manufacturing
In air conditioning systems
In beverage pumps
Who invented the rotary vane pump?
James Watt
Charles K. Barnes
Thomas Edison
Nikola Tesla
What pressure can multi-stage rotary vacuum pumps achieve?
10-3 mbar
1 mbar
10 mbar
100 mbar
What is the main function of the blades in a rotary blade pump?
Increase air pressure
Create chambers with changing volume
Reduce liquid temperature
Decrease rotor speed
Which of the following applications are related to rotary blade pumps?
Supercharging and steering
Semiconductor manufacturing
Cooling systems
Pumps for oil transfer
