Engineering :: Thermodynamics

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81.

Which of the following has miximum specific heats ratio

A.	Argon	B.	Carbon dioxide
C.	Oxygen	D.	Hydrogen

82.

Which of the following has minimum specific heats ratio

A.	Hydrogen	B.	Nitrogen
C.	Mercury vapour	D.	Sulphur dioxide

83.

Specific heat of a gas for a reversible adiabatic process

A.	is zero	B.	is infinity
C.	is negative	D.	varies between zero and infinity

84.

For a real gas obeying van der Waals equation CP-CV is

A.	R	B.	< R
C.	> R	D.	zero

85.

The heat capacities for the ideal-gas state are

A.	functions of temperature only	B.	functions of pressure only
C.	functions of temperature as well as pressure	D.	independent of temperature as well as pressure

86.

For substances which are incompressible CP and CV are related as

A.	Cp = Cv	B.	Cp >> Cv
C.	Cp << Cv

87.

Specific heat of acqueous solutions in general

A.	increases with increasing concentration	B.	decreases with increasing concentration
C.	remains unaffected with change in concentration of solute

88.

In absence of experimental values Kopps rule may be used to calculate the heat capacity of

A.	gases only	B.	liquids only
C.	solids only	D.	gases liquids and solids

89.

According to the law of Petit and Dulong the atmoic heat capacities of the crystalline solid elements are nearly constant and equal to

A.	3.2 cal/g atom	B.	6.2 cal/g atom
C.	5.2 cal/g atom	D.	1.4 cal/g atom

90.

The atomic heat capacities of all solid elements

A.	decreases greatly with decrease in temperature	B.	increases greatly with decrease in temperature
C.	remains unaffected with change in temperature	D.	approaches a value of infinity at absolute zero temperature