Lecture 5

What are the four types of air ducts according to their transporting functions?

• Supply duct, Return duct, Outdoor air duct, Exhaust duct

• Only Supply duct and Return duct

• Only Outdoor air duct and Exhaust duct

• None of the above

What material is used for supply, ventilation, and exhaust ducts?

• Galvanised steel

• Stainless steel

• Plastics

• Fabric

What is the classification of duct systems according to flame spread and smoke development?

• Class 0, Class 1, Class 2

• Class A, Class B, Class C

• Class I, Class II, Class III

• No classification

What are the two classifications of ductwork systems based on velocity of flow?

• Low velocity and High velocity

• Medium velocity and High velocity

• Low velocity and Medium velocity

• No classification

What are the shapes into which ducts can be classified?

• Rectangular, Round, Flat oval, Flexible

• Square, Round, Flat oval, Flexible

• Rectangular, Oval, Triangular, Flexible

• None of the above

What is the major disadvantage of round ducts?

• Greater space required under the beam for installation

• Higher cost

• More air leakage

• Less fluid resistance

What is the purpose of duct insulation?

• To improve thermal and acoustic performance

• To reduce cost

• To increase air leakage

• To make ducts aesthetically pleasing

What type of air outlet is designed to throw air over large distances?

• Side-wall register

• Ceiling diffuser

• Light-air fitting

• Linear slot diffusers

What is the recommended maximum depth for side-wall registers in an office with 3 m of clear headroom?

• 7 m

• 10 m

• 5 m

• 3 m

What is the function of mechanical exhaust systems?

• To ensure a small negative pressure within the exhausted space

• To increase air pressure

• To cool the air

• To filter the air