Refrigeration and Air Conditioning Quizzes | Engineering Mechanics | MEng

Question 1

The coefficient of performance (COP) of a refrigeration system is primarily a measure of its:

Accepted Answer

Energy efficiency

Answer

Cooling capacity

Answer

Refrigerant capacity

Answer

Compressor power

Question 2

In an air conditioning system, the role of the expansion device is to:

Accepted Answer

Regulate the flow of refrigerant into the evaporator

Answer

Increase the pressure of the refrigerant before entering the evaporator

Answer

Decrease the temperature of the refrigerant before entering the evaporator

Answer

Separate the liquid and vapor phases of the refrigerant

Question 3

The main purpose of a condenser in a refrigeration system is to:

Accepted Answer

Release heat from the refrigerant to the surroundings

Answer

Absorb heat from the surroundings to the refrigerant

Answer

Separate the liquid and vapor phases of the refrigerant

Answer

Increase the pressure of the refrigerant

Question 4

Among the given refrigerants, which one possesses the highest ozone depletion potential (ODP)?

Accepted Answer

R-22

Answer

R-134a

Answer

R-410A

Answer

R-717

Question 5

In the context of refrigeration systems, how is the coefficient of performance (COP) defined?

Accepted Answer

The ratio of refrigerating effect to work input

Answer

The ratio of work input to refrigerating effect

Answer

The ratio of condenser heat rejection to evaporator heat absorption

Answer

The ratio of evaporator heat absorption to condenser heat rejection

Question 6

In a refrigeration system, what is the primary function of the condenser?

Accepted Answer

Releasing heat from the refrigerant

Answer

Absorbing heat into the refrigerant

Answer

Pressurizing the refrigerant

Answer

Expanding the refrigerant

Question 7

Centrifugal compressors in refrigeration systems are often utilized in:

Accepted Answer

Large-scale commercial refrigeration

Answer

Domestic refrigerators

Answer

Automotive air conditioning

Answer

Small-scale industrial refrigeration

Question 8

When charging a refrigeration system with refrigerant, what is the recommended approach?

Accepted Answer

Follow the manufacturer's specified charge amount

Answer

Maximize the charge to enhance cooling capacity

Answer

Minimize the charge to reduce energy consumption

Answer

Experiment with different charge levels

Question 9

In a vapor compression refrigeration system, the primary function of the evaporator is to:

Accepted Answer

Absorb heat from the refrigerated space

Answer

Reject heat to the surrounding environment

Answer

Compress the refrigerant

Answer

Expand the refrigerant

Question 10

Which refrigerant has the lowest ozone depletion potential (ODP) and global warming potential (GWP)?

Accepted Answer

R-744 (Carbon dioxide)

Answer

CFC-12

Answer

HFC-134a

Answer

R-410A

Question 11

The Carnot refrigeration cycle represents:

Accepted Answer

The most efficient possible refrigeration cycle

Answer

A practical refrigeration cycle used in real systems

Answer

A simplified cycle with constant pressure and temperature

Answer

A cycle that utilizes mixed refrigerants

Question 12

The coefficient of performance (COP) of a refrigeration system is defined as:

Accepted Answer

Ratio of heat removed from the refrigerated space to the work input

Answer

Ratio of work input to the heat removed from the refrigerated space

Answer

Ratio of evaporator pressure to condenser pressure

Answer

Difference in temperature between evaporator and condenser

Question 13

Psychrometrics deals with the study of:

Accepted Answer

Properties of moist air

Answer

Design of refrigeration systems

Answer

Heat transfer analysis in buildings

Answer

Control of indoor air quality

Question 14

The dry-bulb temperature measures:

Accepted Answer

Temperature of the air

Answer

Temperature of the air-water vapor mixture

Answer

Temperature at which air becomes saturated

Answer

Temperature difference between dry-bulb and wet-bulb

Question 15

In a refrigeration system, the expansion valve serves to:

Accepted Answer

Reduce the pressure of the refrigerant

Answer

Increase the pressure of the refrigerant

Answer

Cool the refrigerant

Answer

Lubricate the compressor

Question 16

In a refrigeration system, which component is responsible for converting liquid refrigerant into a vapor, a process known as evaporation?

Accepted Answer

Evaporator

Answer

Compressor

Answer

Condenser

Answer

Throttle valve

Question 17

Which of the following refrigerants, commonly used in older refrigeration and air conditioning systems, has a high potential for ozone depletion?

Accepted Answer

R-12 (CFC-12)

Answer

R-407C (HFC blend)

Answer

R-717 (Ammonia)

Answer

R-134a (HFC-134a)

Question 18

In the context of air conditioning, what is the term used to describe the process of removing moisture from the air?

Accepted Answer

Dehumidification

Answer

Condensation

Answer

Evaporation

Answer

Humidification

Question 19

In a refrigeration system, which component is responsible for reducing the pressure of the refrigerant as it enters the evaporator?

Accepted Answer

Throttle valve

Answer

Evaporator

Answer

Compressor

Answer

Condenser

Question 20

What is a key advantage of vapor compression refrigeration systems that contributes to their widespread use?

Accepted Answer

High efficiency and reliability

Answer

Compact size

Answer

Environmentally friendly

Answer

Low initial cost