question_answer

Which of the following method(s) is/are adopted in the design of air duct system           

1. Velocity reduction method

2. Equal friction method

3. Static regain method.

Select the correct answer using the codes given below: Codes:

A) 1 alone             

B) 1 and 2

C) 2 and 3            

D) 1, 2 and 3