Test: Air-duct Design


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10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Air-duct Design

Test: Air-duct Design for Mechanical Engineering 2022 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Air-duct Design questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Air-duct Design MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Air-duct Design below.
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Test: Air-duct Design - Question 1

A duct is said to be a low velocity duct if the velocity of air in the duct is upto

Detailed Solution for Test: Air-duct Design - Question 1

Low velocity duct, v< 600 m/min

High velocity duct, v > 600 m/min

Test: Air-duct Design - Question 2

Consider the following statements:
1. The duct may be made of galvanised icon, aluminium and fibre glass.
2. The fibre glass may be used in low velocity applications.
3. The pressure in the duct are usually expressed in mm of water
4. High pressure ducts are designed for static pressure upto 150 mm of water.

Q. Which of the above statements are valid?

Detailed Solution for Test: Air-duct Design - Question 2

Low pressure duct, static pressure < 50 mm of water.
Medium pressure duct, static pressure upto 150 mm of water.
High pressure duct, static pressure vary from 150 to 250 mm of water.

Test: Air-duct Design - Question 3

If the velocity of air flowing duct is V/s, then the velocity pressure (Pv) in mm of water is given by

Detailed Solution for Test: Air-duct Design - Question 3

Test: Air-duct Design - Question 4

When the quality of air passing through the rectangular and circular ducts is same, then the equivalent diameter (D) of a circular duct for a rectangular duct for the same pressure loss per unit length, is given by

Detailed Solution for Test: Air-duct Design - Question 4

Pressure loss due to friction,

for rectangular duc,

Test: Air-duct Design - Question 5

For rectangular ducts, the aspect ratio is equal to

Test: Air-duct Design - Question 6

The static regain method of designing the ducts as compared to equal friction method

Detailed Solution for Test: Air-duct Design - Question 6

in static regain method, the size of duct is decided to give equal pressure at all outlets for perfect balancing of the air duct layout system. This method allows for balancing but reducing velocity increases duct size and it should not be taken beyond the economic limit.

Test: Air-duct Design - Question 7

When the velocity of air passing through the rectangular and circular ducts is same, then the" equivalent diameter (D) of a circular duct for a rectangular duct for the same pressure loss per unit length, is given by

Detailed Solution for Test: Air-duct Design - Question 7

Pressure loss,

for the given condition, mc = mR [Hydraulic mean depth, m]

Test: Air-duct Design - Question 8

The aspect ratio, for rectangular ducts, should not be greater than .... in any case

Detailed Solution for Test: Air-duct Design - Question 8

The material required for the rectangular duct increases with aspect ratio.

Test: Air-duct Design - Question 9

The main supply air duct of an air-conditioning system is 100 cm x 90 cm in cross-section and carries 10 m3/s of air. It branches off into two ducts, one 80 cm x 80 cm and the other 80 cm x 60 cm. If the mean velocity in the larger branch is 9 m/s, what is the mean velocity in smaller branch?

Detailed Solution for Test: Air-duct Design - Question 9


Test: Air-duct Design - Question 10

 Which of the following method(s) is/are adopted in the design of air duct system?
1. Velocity reduction
2. Equal friction
3. Static regain

Q. Select the correct answer using the codes given below:

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