Engineering Thermodynamics
The mass of flue gas per kg of fuel is the ratio of the

Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas

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Engineering Thermodynamics
Carnot cycle consists of

Two constant pressure and two isentropic processes
Two isothermal and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
Two constant volume and two isentropic processes

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

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