Compressors, Gas Turbines and Jet Engines
Diffuser in a compressor is used to

Make the flow streamline
Convert kinetic energy into pressure energy
Increase velocity
Convert pressure energy into kinetic energy

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Compressors, Gas Turbines and Jet Engines
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₃/p₁)1/4
D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/2

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Compressors, Gas Turbines and Jet Engines
Pick up the false statement

Gas turbine is a self starting unit
Exhaust losses in gas turbine are high due to large mass flow rate
Overall efficiency of gas turbine plant is lower than that of a reciprocating engine
Gas turbine does not require huge quantity of water like steam plant

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