A centrifugal fan rotating at 500 rpm. delivers 70 m3/s of air. If the speed is reduced to 200 rpm. the quantity of air delivered in m3/s will be
A. 175
B. 55
C. 28
D. 11
Answer: Option C
Related Questions on Mine Ventilation
The mechanical mixture of gases existing in a mine given off after explosion called
A. White damp
B. Stink damp
C. Black damp
D. After damp
A Drager Gas Mask does not filter
A. Water vapour
B. Nitrous fumes
C. Carbon monoxide
D. Carbon dioxide
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