Engineering Thermodynamics
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

Remain unchanged
Decrease
Increase
Increase/decrease depending on application

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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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