Thermodynamics - Mechanical Engineering Questions and Answers

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In an extensive property of a thermodynamic system

extensive heat is transferred

extensive work is done

extensive energy is utilised

none of these

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When a gas is heated at constant pressure

its temperature will increase

its volume will increase

both temperature and volume will increase

neither temperature not volume will increase

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

True

False

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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 Î³ = Ratio of specific heats)

\(\frac { \rho_1 v_1 - \rho_2 v_2} { Y - 1 }\)

\(\frac { m R (T_1 - T_2) } { Y - 1}\)

\( 23 (\frac { m RT_1 } { Y - 1 } (1- \frac{\rho_2 v_2}{\rho_1v_1}) \)

all of these