Refrigeration and Air Conditioning Quizzes | Engineering Mechanics | BEng

Question 1

The primary purpose of an air conditioning system is to:

Accepted Answer

Control temperature and humidity

Answer

Provide fresh air

Answer

Remove odors

Answer

Reduce noise

Question 2

Which type of air conditioning system is suitable for large commercial buildings?

Accepted Answer

Central system

Answer

Split system

Answer

Window unit

Answer

Portable unit

Question 3

Latent heat is associated with a change in:

Accepted Answer

Phase

Answer

Temperature

Answer

Pressure

Answer

Volume

Question 4

Which of the following is the ideal gas law equation?

Accepted Answer

PV = nRT

Answer

PV = NkT

Answer

PV = nRT/V

Answer

PV = nRT/Nk

Question 5

What is the significance of the triple point of a substance?

Accepted Answer

It is the point where all three phases of a substance coexist in equilibrium.

Answer

It is the point where the vapor pressure of a liquid equals the atmospheric pressure.

Answer

It is the point where the melting point and boiling point of a substance are the same.

Answer

It is the point where the specific heat of a substance is the highest.

Question 6

What is the first law of thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Entropy always increases.

Answer

The internal energy of a closed system is constant.

Answer

Heat flows from hot to cold.

Question 7

What is the entropy of a pure crystalline substance at absolute zero?

Accepted Answer

Zero

Answer

One

Answer

Two

Answer

Three

Question 8

What is the thermal conductivity of a material?

Accepted Answer

The rate at which heat flows through a material due to a temperature difference.

Answer

The amount of heat required to raise the temperature of a material by 1 degree Celsius.

Answer

The specific heat of a material.

Answer

The latent heat of a material.

Question 9

Which of the following thermodynamic cycles represents the ideal refrigeration cycle?

Accepted Answer

Carnot cycle

Answer

Brayton cycle

Answer

Rankine cycle

Answer

Stirling cycle

Question 10

What is the main purpose of a psychrometric chart in the context of HVAC systems?

Accepted Answer

To determine the properties of air containing moisture

Answer

To calculate the cooling requirements of a building

Answer

To design air conditioning systems

Answer

To forecast weather conditions

Question 11

In a refrigeration system, what is the purpose of using a capillary tube?

Accepted Answer

To regulate the flow of refrigerant

Answer

To decrease the refrigerant pressure

Answer

To increase the refrigerant temperature

Answer

To separate the high-pressure and low-pressure sides of the system

Question 12

Within a refrigeration system, which component primarily extracts heat from the refrigerated space?

Accepted Answer

Evaporator

Answer

Expansion valve

Answer

Compressor

Answer

Condenser

Question 13

In air conditioning systems, what is the main function of the condenser?

Accepted Answer

Heat dissipation into the surrounding environment

Answer

Refrigerant compression

Answer

Refrigerant expansion

Answer

Heat absorption from the air

Question 14

In a refrigeration system, the transformation of liquid refrigerant into vapor occurs in which component?

Accepted Answer

Evaporator

Answer

Compressor

Answer

Expansion valve

Answer

Condenser

Question 15

Which type of air conditioning system utilizes a liquid as the cooling medium?

Accepted Answer

Hydronic system

Answer

Window unit

Answer

Split system

Answer

Central system

Question 16

The purpose of the expansion valve in a refrigeration system is to:

Accepted Answer

Control and regulate refrigerant flow

Answer

Vaporize the refrigerant

Answer

Condense the refrigerant

Answer

Compress the refrigerant

Question 17

What is the term for the process of regulating temperature and humidity in indoor spaces?

Accepted Answer

Air conditioning

Answer

Heating

Answer

Ventilation

Answer

Dehumidification

Question 18

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

Accepted Answer

Energy efficiency

Answer

Operational cost

Answer

Cooling capacity

Answer

Reliability

Question 19

What is the primary function of the condenser in a refrigeration system?

Accepted Answer

To transfer heat from the refrigerant to the surroundings.

Answer

To compress the refrigerant.

Answer

To absorb heat from the surroundings.

Answer

To expand the refrigerant.

Question 20

What is the ideal Coefficient of Performance (COP) for a Carnot refrigeration cycle, expressed in terms of the cold reservoir temperature (T_c) and the hot reservoir temperature (T_e)?

Accepted Answer

T_c / (T_e - T_c)

Answer

(T_e - T_c) / T_c

Answer

T_e / (T_e - T_c)

Answer

(T_e - T_c) / T_e

Question 21

Which of the following air conditioning systems utilizes water as a primary heat transfer medium?

Accepted Answer

Hydronic system

Answer

Split system

Answer

Window air conditioner

Answer

VRF system

Question 22

What is the primary function of a plenum in an air conditioning system?

Accepted Answer

To distribute conditioned air evenly throughout the space.

Answer

To cool the air.

Answer

To heat the air.

Answer

To filter the air.

Question 23

Which of the following is a measure of the amount of moisture present in the air, expressed as a percentage of the maximum amount of moisture the air can hold at a given temperature?

Accepted Answer

Relative humidity

Answer

Velocity

Answer

Pressure

Answer

Temperature

Question 24

What is the primary function of a thermostat in an air conditioning system?

Accepted Answer

To control the operation of the system to maintain a desired temperature.

Answer

To dehumidify the air.

Answer

To control the speed of the fan.

Answer

To filter the air.

Question 25

Which of the following air conditioning systems is known for its energy efficiency due to its variable-speed compressor technology?

Accepted Answer

Inverter air conditioner

Answer

Portable air conditioner

Answer

Window air conditioner

Answer

Central air conditioner

Question 26

What is the primary function of an evaporator in an air conditioning system?

Accepted Answer

To absorb heat from the air being conditioned, causing the refrigerant to evaporate.

Answer

To reject heat to the air being conditioned.

Answer

To expand the refrigerant.

Answer

To compress the refrigerant.