Thermodynamics - Mechanical Engineering Questions and Answers

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The hard coke is obtained when carbonisation of coal is carried out at

300° to 500°C

500° to700°C

700° to 900°C

900° to 1100°C

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According to First law of thermodynamics,

total internal energy of a system during a process remains constant

total energy of a system remains constant

workdone by a system is equal to the heat transferred by the system

internal energy, enthalpy and entropy during a process remains constant

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The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

\(\sqrt{\frac { K T } { m } }\)

\(\sqrt{\frac { 2 K T } { m } }\)

\( \sqrt{\frac { 3K T } { m } }\)

\(\sqrt{\frac { 5 K T } { m } }\)

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Stirling cycle consists oftwo constant volume and two isentropic processes

two constant volume and two isentropic processes

two constant volume and two isothermal processes

two constant pressure and two isothermal processes

one constant volume, one constant pressure and two isentropic processes