Engineering Thermodynamics
The compression ratio is the ratio of

Total volume to swept volume
Total volume to clearance volume
Swept volume to clearance volume
Swept volume to total volume

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Actual temperature drop)/(Isentropic temperature drop)
(Isentropic increase in temperature)/(Actual increase in temperature)
(Net work output)/(Heat supplied)
(Net work output)/(Work-done by the turbine)

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Engineering Thermodynamics
An open system is one in which

Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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