WorksheetsRefrigeration and AC
Total questions: 30
Worksheet time: 15mins
Which of the following best describes the Second Law of Thermodynamics?
Energy can neither be created nor destroyed
Heat flows naturally from a hotter to a colder body
The internal energy of a system remains constant
Work is a form of heat
Which thermodynamic process occurs at constant temperature?
Isochoric
Isothermal
Isobaric
Isentropic
In which process is the volume of the system held constant, so no work is done?
Isobaric
Isochoric
Isentropic
Isenthalpic
A reversible adiabatic process (no heat transfer, fully reversible) is also called:
Isobaric
Isenthalpic
Isentropic
Isometric
In an ideal cycle, liquid leaves the condenser and is expanded in such a manner that the enthalpy of the liquid is equal to the enthalpy of the resulting saturated mixture. This type of expansion is known as:
Isothermal process
Adiabatic process
Isochoric process
Throttling process
It is the process of removing heat from the system so that the temperature is lower that its surroundings.
Refrigeration
Air conditioning
Freezing
None of the above
What is the most theoretically efficient refrigeration cycle?
Reversed Carnot Cycle
Vapor-Compression Cycle
Gas Cycle
Barton Cycle
It is the only mechanically moving part of a typical vapor compression refrigeration system.
Evaporator
Compressor
Condenser
Expansion valve
It is the part of a VC refrigerator that provides the refrigerating effect of the system.
Evaporator
Compressor
Condenser
Expansion Valve
It is the rate at which heat must be removed from refrigerated space or material in order to produce and maintain the desired temperature conditions.
Cooling load
Energy load
Transfer load
Removal load
In a vapor-compression refrigeration system, which working fluid is responsible for repeatedly undergoing phase changes to absorb heat from a low-temperature region and reject it to a high-temperature region, while also serving as the medium for energy transfer throughout the cycle?
Coolant
Working Gas
Refrigerant
Compressor oil
What property of the refrigerant characterizes its capacity to absorb heat?
Density
Boiling Point
Viscosity
Latent heat
Which of the following is not a source of heat load in a cold storage facility?
Product load
Transmission
Diffusion Load
Infilitration Load
Which factor increases the transmission heat load in cold storage?
High product moisture content
Low ambient temperature
Poor insulation
Increased evaporator efficiency
Which of the following actions helps reduce infiltration heat load?
Increased ceiling height
Use larger doors
Use air curtains
Keep lights on at all times
It meters the proper amount of liquid refrigerant entering the evaporator.
Expansion valve
Hot gas line
Condenser
Suction line
What is the state of refrigerant at the suction line?
Liquid
Low temperature
Low vapor pressure
Solid
It provides a heat transfer surface through which heat can pass from the refrigerated space or product into the vaporizing refrigerant
Compressor
Condenser
Back pressure valve
Evaporator
What happens to the refrigerant at the condenser?
It turns to gas
Pressure is reduced
Temperature is reduced
It turns to solid
At the condenser, the condensing temperature is equal to the ?
Saturation temperature
Critical temperature
Ambient temperature
Wet bulb temperature
It refers to the quantity of heat that each unit mass of refrigerant absorbs from the refrigerated space
Refrigerating Effect
System Capacity
System Efficiency
Volumetric Efficiency
(ABELE 2022) Commonly used refrigerant but toxic and flammable but has excellent thermal properties
Dichlorodifluoromethane
Chlorodifluoromethane
Tetrafluoroethane
Ammonia
(ABELE 2023) In refrigeration system component, the highest pressure change can be found at the ___
Compressor
Evaporator
Condenser
Expansion Valve
(ABELE 2023) In refrigeration system component, the line that delivers refrigerants to the inlet of compressor is?
Suction Line
Discharge Line
Liquid Line
Condenser Line
Ikaw karong december 2025
(a)
What is the most common type of refrigeration system used in domestic, commercial, and industrial applications.
Reverse Carnot Refrigeration Systems
Absorption Refrigeration System
Gas Cycle Systems
Vapor-Compression Systems
It is a type of refrigeration system that uses a solution of water and ammonia as the working fluid
Reverse Carnot Refrigeration Systems
Absorption Refrigeration System
Gas Cycle Systems
Vapor-Compression Systems
What type of refrigeration system does not have any moving parts?
Gas Cycle System
Evaporative Cooling System
Thermoelectric System
Steam Jet System
Which statement correctly reflects the Kelvin–Planck statement of the Second Law?
Heat cannot spontaneously flow from hot to cold
No engine can convert all absorbed heat into work
Entropy of isolated systems always decreases
All reversible processes are isentropic
It states that it is impossible for heat to spontaneously transfer from a lower-temperature body to a higher temperature body
Boyle Statement
Gay-Lussac Statement
Kelvin-Planck Statement
Clausius Statement
