Thermodynamics Objective Questions and Answers

589. The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

590. Which of the following gas has the highest calorific value?

A. Coal gas

591. The oxygen atom is __________ times heavier than the hydrogen atom.

592. When the gas is cooled at constant pressure,

A. its temperature increases but volume decreases

B. its volume increases but temperature decreases

C. both temperature and volume increases

D. both temperature and volume decreases

Discussion

593. The principal constituents of a fuel are

A. carbon and hydrogen

B. oxygen and hydrogen

C. sulphur and oxygen

D. sulphur and hydrogen

Discussion

594. When a gas is heated at constant pressure

A. its temperature will increase

B. its volume will increase

C. both temperature and volume will increase

D. neither temperature not volume will increase

Discussion

595. One kg of carbon monoxide requires 4/7 kg of oxygen and produces

A. 11/3 kg of carbon dioxide gas

B. 7/3 kg of carbon monoxide gas

C. 11/7 kg of carbon dioxide gas

D. 8/3 kg of carbon monoxide gas

Discussion

Mechanical Engineering Objective Questions { Thermodynamics }