Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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Engineering Thermodynamics
Carbonization of coal consists of

Drying and crushing the coal to a fine powder
None of these
Moulding the finely ground coal under pressure with or without a binding material
Heating the wood with a limited supply of air to temperature not less than 280°C

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