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Refrigeration and AC

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.

Which of the following best describes the Second Law of Thermodynamics?

a)

Energy can neither be created nor destroyed

b)

Heat flows naturally from a hotter to a colder body

c)

The internal energy of a system remains constant

d)

Work is a form of heat

2.

Which thermodynamic process occurs at constant temperature?

a)

Isochoric

b)

Isothermal

c)

Isobaric

d)

Isentropic

3.

In which process is the volume of the system held constant, so no work is done?

a)

Isobaric

b)

Isochoric

c)

Isentropic

d)

Isenthalpic

4.

A reversible adiabatic process (no heat transfer, fully reversible) is also called:

a)

Isobaric

b)

Isenthalpic

c)

Isentropic

d)

Isometric

5.

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:

a)

Isothermal process

b)

Adiabatic process

c)

Isochoric process

d)

Throttling process

6.

It is the process of removing heat from the system so that the temperature is lower that its surroundings.

a)

Refrigeration

b)

Air conditioning

c)

Freezing

d)

None of the above

7.

What is the most theoretically efficient refrigeration cycle?

a)

Reversed Carnot Cycle

b)

Vapor-Compression Cycle

c)

Gas Cycle

d)

Barton Cycle

8.

It is the only mechanically moving part of a typical vapor compression refrigeration system.

a)

Evaporator

b)

Compressor

c)

Condenser

d)

Expansion valve

9.

It is the part of a VC refrigerator that provides the refrigerating effect of the system.

a)

Evaporator

b)

Compressor

c)

Condenser

d)

Expansion Valve

10.

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.

a)

Cooling load

b)

Energy load

c)

Transfer load

d)

Removal load

11.

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?

a)

Coolant

b)

Working Gas

c)

Refrigerant

d)

Compressor oil

12.

What property of the refrigerant characterizes its capacity to absorb heat?

a)

Density

b)

Boiling Point

c)

Viscosity

d)

Latent heat

13.

Which of the following is not a source of heat load in a cold storage facility?

a)

Product load

b)

Transmission

c)

Diffusion Load

d)

Infilitration Load

14.

Which factor increases the transmission heat load in cold storage?

a)

High product moisture content

b)

Low ambient temperature

c)

Poor insulation

d)

Increased evaporator efficiency

15.

Which of the following actions helps reduce infiltration heat load?

a)

Increased ceiling height

b)

Use larger doors

c)

Use air curtains

d)

Keep lights on at all times

16.

It meters the proper amount of liquid refrigerant entering the evaporator.

a)

Expansion valve

b)

Hot gas line

c)

Condenser

d)

Suction line

17.

What is the state of refrigerant at the suction line?

a)

Liquid

b)

Low temperature

c)

Low vapor pressure

d)

Solid

18.

It provides a heat transfer surface through which heat can pass from the refrigerated space or product into the vaporizing refrigerant

a)

Compressor

b)

Condenser

c)

Back pressure valve

d)

Evaporator

19.

What happens to the refrigerant at the condenser?

a)

It turns to gas

b)

Pressure is reduced

c)

Temperature is reduced

d)

It turns to solid

20.

At the condenser, the condensing temperature is equal to the ?

a)

Saturation temperature

b)

Critical temperature

c)

Ambient temperature

d)

Wet bulb temperature

21.

It refers to the quantity of heat that each unit mass of refrigerant absorbs from the refrigerated space

a)

Refrigerating Effect

b)

System Capacity

c)

System Efficiency

d)

Volumetric Efficiency

22.

(ABELE 2022) Commonly used refrigerant but toxic and flammable but has excellent thermal properties

a)

Dichlorodifluoromethane

b)

Chlorodifluoromethane

c)

Tetrafluoroethane

d)

Ammonia

23.

(ABELE 2023) In refrigeration system component, the highest pressure change can be found at the ___

a)

Compressor

b)

Evaporator

c)

Condenser

d)

Expansion Valve

24.

(ABELE 2023) In refrigeration system component, the line that delivers refrigerants to the inlet of compressor is?

a)

Suction Line

b)

Discharge Line

c)

Liquid Line

d)

Condenser Line

25.

Ikaw karong december 2025

(a)  

26.

What is the most common type of refrigeration system used in domestic, commercial, and industrial applications.

a)

Reverse Carnot Refrigeration Systems

b)

Absorption Refrigeration System

c)

Gas Cycle Systems

d)

Vapor-Compression Systems

27.

It is a type of refrigeration system that uses a solution of water and ammonia as the working fluid

a)

Reverse Carnot Refrigeration Systems

b)

Absorption Refrigeration System

c)

Gas Cycle Systems

d)

Vapor-Compression Systems

28.

What type of refrigeration system does not have any moving parts?

a)

Gas Cycle System

b)

Evaporative Cooling System

c)

Thermoelectric System

d)

Steam Jet System

29.

Which statement correctly reflects the Kelvin–Planck statement of the Second Law?

a)

Heat cannot spontaneously flow from hot to cold

b)

No engine can convert all absorbed heat into work

c)

Entropy of isolated systems always decreases

d)

All reversible processes are isentropic

30.

It states that it is impossible for heat to spontaneously transfer from a lower-temperature body to a higher temperature body

a)

Boyle Statement

b)

Gay-Lussac Statement

c)

Kelvin-Planck Statement

d)

Clausius Statement