CPD PROGRAMME Module 35 December 2011
1. From the data referred to in the article, which of the following is likely to have the highest peak total efficiency?
A Aerofoil centrifugal fan B Backward curved centrifugal fan C Backward inclined centrifugal fan D Forward curved centrifugal fan E Tube axial centrifugal fan
2. What is the principal purpose of the scroll casing in a centrifugal fan?
A To act as a safety device B To convert the kinetic energy into static pressure C To enhance the appearance of the fan D To ensure the inlet air is scrolled into the inlet E To maximise the air’s exit velocity
3. How might the overall efficiency of a backward curved impeller plug fan installation be improved?
A Increase its speed B Make the impeller forward curved C Remove the scroll casing
D Use bell mouth outlets leading into the ducts from the plenum
E Stop the air leaving the fan impeller radially
4. Which one of these is most likely to be true about axial configuration fans?
A As the air leaves the fan, the swirling air will automatically straighten due to the fan rotation
B They are particularly known for high-pressure high flowrate applications
C They have a particularly stable flow pattern across all flowrates
D Air is unlikely to flow if the rotation of the fan is reversed
E The mixed flow fan will produce higher pressures than a plain axial fan
5. Which of these is LEAST likely to be a manifestation of a regularly stalled fan?
A Vibration from the fan B Damaged bearings C Stable air flow D Pulsing ductwork E Rumbling noise
54 CIBSE Journal December 2011
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