Induced draft fans provided in large thermal power plant boilers have __________ blades.
A. Forward curved
B. Backward curved
C. Double curved
D. Radial or straight
Answer: Option B
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ID fans should have low velocity so as to avoid erosion as they handle the flue gases, so vb(blade velocity) is low in case of forward curv blade, so answer is forward curved blade
Induced draft fans provided in large thermal power plant boilers have forward curved blades. The answer given by you is wrong. Refer to power plant engineering by RK purohit.