CPD PROGRAMME Module 31 August 2011

1. Overall, how much electrical energy is it thought that fans consume in buildings?

A 10% B 15% C 20% D 25% E 30%

2. In a horizontal pipe if the water static pressure is 500Pa and the total pressure (ignoring potential pressure) is 5,000Pa, what is the approximate velocity of the water?

A 1m/s B 2m/s C 3m/s D 4m/s E 5m/s

3. If a duct has air passing through it with an average velocity of 4m/s, and it then transforms through a very smooth (frictionless) expansion so that the velocity is 3m/s, what is the value of static regain?

A 3.2Pa B 4.2Pa C 5.2Pa D 6.2Pa E 7.2Pa

4. If a bend in a duct has a ζ of 0.5 and the velocity is 2m/s, what is the most likely air pressure drop through the bend

A 1.2Pa B 1.8Pa C 2.4Pa D 3.6Pa E 4.8Pa

5. What would be the approximate Reynolds number for air at 20C with a velocity of 2m/s flowing down a 400mm diameter duct?

A 23,000 B 33,000 C 43,000 D 53,000 E 63,000

44 CIBSE Journal August 2011

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