Important Questions with Answers

ANNA UNIVERSITY Part - A '2' Marks Q & A

1. What is ventilation?

The term ventilation is used to mean the free passage of clean air in a structure. In other words, the removal of all vitiated air from a building and its replacement with fresh air is known as ventilation.

2. What are the factors affecting ventilation?

1. Air changes

2. Humidity

3. Quality of air

4. Temperature

5. Use of building

3. What are the type of ventilation?

The system of ventilation are classified into the following two types

1. Natural ventilation

2. Mechanical or artificial ventilation

4. What are the methods of artificial ventilation?

(i) Exhaust system

(ii) Supply system

(iii) Combination of exhaust and supply systems

(iv)Plenum process

 (v) Air-conditioning

5. What is air conditioning?

It is defined as the process of controlling and maintaining the properties of air like temperature, humidity, purity, direction of flow etc., in a closed space.

6. What is the principle of air conditioning?

An Air-conditioner continuously draws air from an indoor and cools it by the refrigeration principles and discharges it back into the same indoor space.

7. What are the classification of air conditioning systems?

The air-conditioning systems can be classified into two categories, as shown

(a) Summer air-conditioning

(b) Winter air-conditioning

(c) Year-around air-conditioning

8. What is window air-conditioner?

Window air-conditioner is also known as room air-conditioner

• Is It is designed to condition the air in a single room or a large scale.

• It is called a window air-conditioner because it is usually installed in a window.

9. What are the components of a window air-conditioner?

• The main components of a window air-conditioner are:

(i) Compressor

(ii) Condenser

(iii) Air filter

(iv) Evaporator

(v) Motor

(vi) Fans

(vii) Thermostat

10. What are the advantages of the window air-conditioner?

• For each unit, an individual temperature control device is provided.

• For air distribution, ducts are not required.

11. What are the disadvantages of the window air-conditioner

• The unit is installed outside the wall.

. • This unit has a fixed air quantity.

12. What is packaged the air conditioner?

Packaged air conditioner is a self-contained unit primarily for floor mounting, designed to provide conditioned air to the space to be conditioned.

13. What is chilled water plant?

Chilled water is extensively used as a secondary refrigerant in larger commercial, institutional and industrial premises to make cooling available over a large area.

14. What is cooling load?

It is defined as the total heat required to be removed from the space in order to bring it to the desired temperature by air conditioning and refrigerating equipment.

15. What are the different air conditioning system?

1. Central Air Conditioning

2. Split Air Conditioner

3. Window Air Conditioner

4. Portable Air Conditioner

5. Hybrid Air Conditioner

16. What are the common causes of AC fire?

1. Failing to keep cleaned properly

2. Storing flammable materials near the A system

3. Faulty parts and equipment

ANNA UNIVERSITY Part B (16 Marks) Questions

1. Discuss principles of natural ventilation, ventilation measurements and design for natural ventilation.

2. Describe construction and working of window air conditioner.

3. Write note on (a) packaged air conditioner (b) chilled water plant.

4. Write note on (a) Fan coil units (b) Water piping

5. Discuss different air conditioning systems for buildings.

6. What are the common causes of AC fires? What are the steps to be taken to prevent the fires?