Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be cooled to the temperature inside the refrigerator
The room will be cooled very slightly
The room will be gradually warmed up
The temperature of the air in room will remain unaffected

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Engineering Thermodynamics
Producer gas is obtained by

Passing air and a large amount of steam over waste coal at about 650°C
Passing steam over incandescent coke
Carbonization of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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