Engineering Thermodynamics
The efficiency of the Carnot cycle may be increased by

Increasing the lowest temperature
Decreasing the highest temperature
Keeping the lowest temperature constant
Increasing the highest temperature

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Engineering Thermodynamics
Carbonization of coal consists of

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

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