Engineering :: Thermodynamics

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61.

A substance above its critical temperature exists as

A.	solid	B.	liquid
C.	gas	D.	saturated vapours

62.

The temperature above which a substance can exists only in its gaseous state and cannot be liquefied regardless of the magnitude of pressure exerted on it is called

A.	boiling point	B.	saturation temperature
C.	critical temperature	D.	inversion temperature

63.

A gas can be liquefied by pressure alone only when its temperature is

A.	higher than its critical temperature	B.	equal to or higher than its critical temperature
C.	less than or equal to its critical temperature	D.	less than its critical temperature

64.

The triple point of water occurs at 0.00602 atm and

A.	0.01 ?C	B.	444.6?C
C.	100?C	D.	4?C

65.

The critical volume (Vc) for all for all gases obeying van der Walls equation of state is equal to

A.	b	B.	2b
C.	3b	D.	4b

66.

At the critical point of a substance

A.	there is no distinction between liquid and vapour phases	B.	the densities of the liquid and vapour become equal
C.	the surface tension vanishes	D.	all of these asnwers

67.

The SI unit of Cp is

A.	J/kg.K	B.	J/kg
C.	W/kg.K	D.	J/m3.K

68.

Equation CP-Cv = R is

A.	true for an ideal gas only	B.	true for any real gas
C.	true for ideal as well as real gases	D.	not true for any gas

69.

The specific heat of saturated water vapour at 100?C is

A.	zero	B.	positive
C.	negative	D.	infinity

70.

The two specific heats at constant pressure and at constant volume are equal at

A.	0?C	B.	0 K
C.	0?F	D.	0?R