Thermodynamics: Objective Questions Answers

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Thermodynamics Objective Questions

Here is the list of few thermodynamics objective questions answers. You can go through these thermodynamics objective questions answers and revise your level of preparation for your upcoming Mechanical Engineering exams like GATE, IES, ISRO, and other government and Non-Government Exams.

Note: More thermodynamics objective questions answers pdf with full explanation will be uploaded soon. So, keep visiting this thermodynamics objective questions article.

Read Also- Basic Terms in Thermodynamics

1. Which of the following is the extensive property of a thermodynamic system?

A. Pressure

B. Density

C. Volume

D. Temperature

Click for Answer/Explanation

Correct Answer is C

Properties whose values depend on the mass of a system like – Volume etc.

2. In which one of the following working substances, does the relation T1 /T2 = (ρ1 2)0.286 hold if the process takes place with zero heat transfer?

A. Wet Steam

B. Air

C. Isentropic

D. Petrol Vapor and Air mixture

Click for Answer/Explanation

Correct Answer is B

Air

T1 /T2 = (ρ1 2)(γ-1)/γ

Put γ = 1.4

3. In new temperature, scale say °ρ, the boiling and freezing points of water at one atmosphere are 100 °ρ and 300 °ρ respectively. Correlate the scale with the Centigrade scale. The reading of 0 °ρ on the Centigrade scale is-

A. 0 °C

B. 25 °C

C. 100 °C

D. 150 °C

Click for Answer/Explanation

Correct Answer is D

150 °C

Use the basic formula, used for conversion.

4. Which of the following statements apply to a perfect gas will also be true for an irreversible process?

A. Tds = du + pdV

B. dQ = du + pdV

C. dQ = Tds

D. None of these

Read Also- Industrial Engineering Objective Questions

Click for Answer/Explanation

Correct Answer is A

Tds = du +pdV

All these are properties.

5. The correct sequence in decreasing order of the value of the characteristic gas constant of the given gases –

A. Nitrogen, Air, Hydrogen, Carbon-di-oxide

B. Nitrogen, Air, Carbon-di-oxide, Hydrogen,

C. Air, Nitrogen, Hydrogen, Carbon-di-oxide

D. Hydrogen, Nitrogen, Air, Carbon-di-oxide

Click for Answer/Explanation

Correct Answer is D

Characteristic Gas Constant is inversely proportional to Molecular Weight.

So,

Hydrogen = 2

Nitrogen = 28

Air = 29

CO2 = 44

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