The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

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The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

(A) W₁/(W₁ + W₂)

(B) W₂/(W₁ + W₂)           (Ans)

(C) (W₁ + W₂)/W₁

(D) (W₁ + W₂)/W₂