Engineering :: Thermodynamics

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31.

The minimum number of degrees of freedom for any system is

A.	0	B.	1
C.	2	D.	3

32.

The number of degrees of freedom at the triple point of water is

A.	1	B.	2
C.	3	D.	0

33.

For liquid water in equilibrium with a mixture of water vapour and nitrogen the number of degrees of freedom is

A.	0	B.	1
C.	2	D.	3

34.

For a three phase system is equilibrium made up of three non-reacting chemical species the number of degrees of freedom is

A.	0	B.	1
C.	2	D.	3

35.

Which of the following statements violates the postulates of the kinetic theory of gases?

A.	Gases consist of a large number of tiny particles	B.	All the molecules are in a state of rapid motion
C.	The molecules in a gas remain at rest	D.	The pressure exerted by the gas results from the impact of the molecules on the walls of the containing vessel

36.

The number of molecules present in 1 g mol of a gas is known as

A.	atomic number	B.	vapour density
C.	Avogadro number	D.	none of the above

37.

The translational kinetic energy of molecules of an ideal gas is

A.	directly proportional to its absolute temperature	B.	directly proportional to square root of its absolute temperature
C.	directly proportional to square of its absolute temperature	D.	independent of its temperature

38.

When the temperature of an idealgas is increased from 27?C to 927?C the kinetic energy will be

A.	same	B.	twice
C.	eight times	D.	four times

39.

Air is

A.	a gas	B.	a mixture of gases
C.	a mixture of gases and vapour	D.	a mixture of vapours

40.

Imperfect gases are those

A.	which contain impurities	B.	which do not obey Charles and Boyles law
C.	whose molecules are not spherical	D.	whose molecules cannot be regarded as point masses