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

• A. <img src="/_files/images/mechanical-engineering/compressors-gas-dynamics-and-gas-turbines/375-103-1.png">
• B. <img src="/_files/images/mechanical-engineering/compressors-gas-dynamics-and-gas-turbines/375-103-2.png">
• C. <img src="/_files/images/mechanical-engineering/compressors-gas-dynamics-and-gas-turbines/375-103-3.png">
• D. <img src="/_files/images/mechanical-engineering/compressors-gas-dynamics-and-gas-turbines/375-103-4.png">