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

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

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Engineering Thermodynamics
According to Avogadro's Hypothesis

The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
The sum of partial pressure of mixture of two gases is sum of the two
Gases have two values of specific heat
Product of the gas constant and the molecular weight of an ideal gas is constant

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

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