Engineering Thermodynamics
The more effective way of increasing efficiency of Carnot engine is to

Increase lower temperature
Decrease lower temperature
Decrease higher temperature
Increase higher temperature

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Engineering Thermodynamics
Carbonization of coal consists of

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

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Engineering Thermodynamics
According to Kelvin-Planck’s statement of second law of thermodynamics,

None of these
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body

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