Two fan wheels are rotating at the same speed. One wheel has forward curved blades and the other has backward inclined blades. The velocity of the air leaving the forward curved blades is considerably higher for which of the following reasons?
a) The centrifugal force of the forward curved blades is higher.
b) The forward motion of the forward curved blades is higher.
c) The air resistance of the backward curved blades is much lower.
d) The inclination of the blades in the forward curved fan increases the resultant force vector while the backward curved blade inclination decreases the resultant vector.
e) All of the above.
Answer: D