Mechanical Engineering Objective Questions { Thermodynamics }

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526. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

B. Charles' law

C. Gay-Lussac law

D. all of these

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527. According to Kelvin-Planck's statement of second law of thermodynamics,

A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

B. it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

C. it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body

D. none of the above

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528. According to Avogadro's law

A. the product of the gas constant and the molecular mass of an ideal gas is constant

B. the sum of partial pressure of the mixture of two gases is sum of the two

C. equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

D. all of the above

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529. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

A. isothermal process

B. hyperbolic process

C. adiabatic process

D. polytropic process

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530. Which of the following gas has a minimum molecular mass?

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531. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

A. law of equipartition of energy

B. law of conservation of energy

C. law of degradation of energy

D. none of these

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532. The fuel mostly used in steam boilers is

C. coking bituminous coal

D. non-coking bituminous coal

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