Thermodynamics - Mechanical Engineering Questions and Answers

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Otto cycle consists of

two constant volume and two isentropic processes

two constant pressure and two isentropic processes

two constant volume and two isothermal processes

one constant pressure, one constant volume and two isentropic processes

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The increase in entropy of a system represents

increase in availability of energy

increase in temperature

decrease in pressure

degradation of energy

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In a free expansion process,

W_{1 - 2} = 0

Q_{1 - 2} = 0

dU = 0

all of these

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The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s². The absolute pressure in the vessel is

23.97 bar

25 bar

26.03 bar

34.81 bar