Test: Air-duct Design - Mechanical Engineering MCQ
10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Air-duct Design
A duct is said to be a low velocity duct if the velocity of air in the duct is upto
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?
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.
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If the velocity of air flowing duct is V/s, then the velocity pressure (Pv) in mm of water is given by
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
The static regain method of designing the ducts as compared to equal friction method
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
The aspect ratio, for rectangular ducts, should not be greater than .... in any case
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?
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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45 videos|314 tests
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