1
GATE ME 1993
+1
-0.3
The relationship $$\,{\left( {\partial T/{\partial _p}} \right)_h} = 0$$ holds good for :
A
An ideal gas at any state
B
A real gas at any state
C
Any gas at its critical state
D
Any gas at its inversion point
2
GATE ME 1993
+1
-0.3
At the point of a pure substance, the number of degrees of freedom is :
A
$$0$$
B
$$1$$
C
$$2$$
D
$$3$$
3
GATE ME 1993
Subjective
+2
-0
In the vicinity of the triple point, the vapour pressures of liquid and solid ammonia are respectively given by
\eqalign{ & \ln \,\,P = 15.16 - 3063/T \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,and \cr & \ln \,\,P = 18.70 - 3754/T \cr}

Where $$p$$ is in atmospheres and $$T$$ is in Kelvin. What is the temperature at the triple point.

4
GATE ME 1993
Subjective
+2
-0
A vessel of volume $$\,\,1.0\,\,{m^3}$$ contains a mixture of liquid water and steam in equilibrium at $$1.0$$ bar.Given that $$90\%$$ of the volume is occupied by the steam, find the dryness fraction of the mixture. Assume, at $$1.0$$ bar, $${\,{v_f} = 0.001\,\,{m^3}/kg}$$ and $${\,{v_g} = 1.7\,\,{m^3}/kg}.$$
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