The tube axial flow fan:
a. Has higher duct friction losses than centrifugal fans
b. Has lower friction losses in ducts than the centrifugal fan
c. Is quiet in operation
d. Produces lower pressure than the propeller fan
e. Is not suitable for duct mounting
Answer: A
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Power Engineering Chapter 127
- Forward curved fans
- Control of the static pressure and horsepower requirements at a given speed is obtained by using
- Centrifugal fans are classified as
- When comparing the tube axial fan with the vane axial fan the main difference between the two is the
- The group of fans which consist of a rotor or wheel having several radial blades, which is mounted on a shaft within the fan housings is
- Backward inclined centrifugal fans:
- 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, because
- Which of the following statements about fan performance curves is false?
- The two general groups of fans are:
- When a fan outlet is fully open,
- Axial flow fans are classified as:
- The vane axial flow fan:
- Backward inclined airfoil fans:
- Axial flow fans:
- The static pressure measured in an air duct is measured by connecting a:
- To minimize fan vibration problems and premature fan belt wear, it is proper to use
- Total pressure exerted by the air is the sum of:
- Forward curved centrifugal fans:
- The propeller axial flow fan:
- With regard to fan capacity control, which of the following devices has a de-clutching feature?
- The two general groups of fans are: