Mechanical Engineering - Thermodynamics

6. 

The principal constituents of a fuel are

A. carbon and hydrogen
B. oxygen and hydrogen
C. sulphur and oxygen
D. sulphur and hydrogen

Answer: Option A

Explanation:

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7. 

In an extensive property of a thermodynamic system

A. extensive heat is transferred
B. extensive work is done
C. extensive energy is utilised
D. none of these

Answer: Option D

Explanation:

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8. 

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

Answer: Option C

Explanation:

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9. 

By decreasing the highest temperature in the Carnot cycle, its efficiency is increased.

A. True
B. False

Answer: Option B

Explanation:

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10. 

Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

A.
B.
C.
D. all of these

Answer: Option D

Explanation:

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