Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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Engineering Thermodynamics
First law of thermodynamics

Does not enable to determine change in entropy
Provides relationship between heat, work and internal energy
Enables to determine change in internal energy of the system
All of these

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Engineering Thermodynamics
Coke is produced

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
By heating wood with a limited supply of air to a temperature not less than 280°C
From the finely ground coal by moulding under pressure with or without a binding material
When coal is first dried and then crushed to a fine powder by pulverizing machine

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