Artificial draught produced by a fan can be controlled by the___________________?
Correct answer: D. All A., B. and C.
- A. Speed of the fan
- B. Damper
- C. Variation in the pitch of the fan blades
- D. All A., B. and C.
Explanation
Fan-produced draught can be adjusted by changing fan speed, throttling with a damper, or changing blade pitch in a variable-pitch fan. Since all three methods regulate flow or fan performance, option D is correct.
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