MECHANICAL ENGINEERING THERMODYNAMICS MCQs

The fact that the product of pressure and volume of a fixed amount of gas is of approximately constant value is known as

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On a Mollier chart the flow through turbine is represented by

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In a steam turbine when steam expands, the entropy

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An isolated system

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The statement that energy can be neigher created nor destroyed but only converted from one form to another, is known as

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The sequence of processes that eventually returns the working substance to its original state is known as

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The general gas equation is

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The slope of constant pressure line on temperature entropy diagrm is given by

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1 atmospheric pressure is equal to

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A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

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The efficiency and work ratio of a simple gas turbine cycle are

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The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

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An adiabatic process is one in which

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Which of the following is the lightest and most volatile liquid fuel

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The processes occuring in open system which permit the transfer of mass to and from the system, are known as

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Which of the following has the minimum atomic mass

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Workdone in a free expansion process is

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The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas

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The compression ratio for petrol engines is

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The efficiency of Diesel cycle approaches to Otto cycle efficiency when

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The entropy __________ in an irreversible cyclic process.

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The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

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If all the variables of a steam are in-dependent of time it is said to be in

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According to Charle's law

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The perfect heat engine works on the Carnot cycle between 1000?C and 200?C. The efficiency of the engine will be

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In a reversible polytropic process

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In the polytropic process pvn = Constant if n = 1 the process is termed as

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A system consisting of more than one phase is known as

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Which of the following gas has the highest calorific value

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The absolute zero pressure will be

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A cycle consisting of two isothermal and two isentropic processes, is known as

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The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

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The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

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The ultimate analysis of coal consists of the determination of the percentage of

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A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

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A safety valve is used on boilers to

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The charge in a Diesel engine consists of

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Free piston engines find application in

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Entropy of the universe tends to

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A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

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