1.

The efficiency of the vane blower is (where W‚ÇÅ = Workdone due to compression, and W‚ÇÇ = Workdone due to back flow)$

A. W‚ÇÅ/(W‚ÇÅ + W‚ÇÇ)
B. W‚ÇÇ/(W‚ÇÅ + W‚ÇÇ)
C. (W‚ÇÅ + W‚ÇÇ)/W‚ÇÅ
D. (W‚ÇÅ + W‚ÇÇ)/W‚ÇÇ
Answer» C. (W‚Äö√á√Ö + W‚Äö√á√á)/W‚Äö√á√Ö


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