For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
Correct answer: B. Directly as gas density
- A. Directly as square of gas density
- B. Directly as gas density
- C. Directly as square root of gas density
- D. Inversely as gas density
Explanation
At fixed speed and volumetric capacity, the fan's pressure rise scales with dynamic pressure, ρv², while power scales as pressure times volumetric flow. Thus both pressure and power vary directly with gas density, not with its square.
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