CPD PROGRAMME Module 34 November 2011
1. If air at 20C left a room supply diffuser at 4 m/s what would be the total pressure required from the fan if the static pressure loss in the system was 112Pa?
A 10Pa B 102Pa C 112Pa D 116Pa E 122Pa
2. Which of these is not taken into account in the published efficiency data for a fan?
A Bearing loss B Shock loss C Turbulence loss D Motor loss E Casing air friction loss
3. If a system has a calculated pressure loss of 160Pa at an air flow rate of 2m3 rate of 2.5m3
/s what is the pressure drop likely to be at an air flow /s?
A 160Pa B 180Pa C 200Pa D 225Pa E 250Pa
4. If the speed of a fan is increased from 750 revolutions per minute to 900 revolutions per minute, how much is the air volume flow rate likely to rise?
A 5% B 10% C 20% D 56% E 95%
5. What can be expected as a power conversion efficiency of an electronic VFD?
A 2% B 20% C 75% D 96% E 100%
64 CIBSE Journal November 2011
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