Test: Properties of Pure Substances - 2


9 Questions MCQ Test Thermodynamics | Test: Properties of Pure Substances - 2


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Attempt Test: Properties of Pure Substances - 2 | 9 questions in 30 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Thermodynamics for Mechanical Engineering Exam | Download free PDF with solutions
QUESTION: 1

Triple point is the point in

Solution:

QUESTION: 2

A substance expands on freezing only if

Solution:

Correct Answer :- A

Explanation : A substance expands on freezing only if the slope of the fusion line on the pressure temperature chart is negative.

QUESTION: 3

On a P-V-T surface, the triple point and critical point are seen as respectively

Solution:

QUESTION: 4

In the mollier diagram for steam, dryness fraction lines converge at

Solution:

QUESTION: 5

For a mixture of solid, liquid and vapour phases of a pure substance in equilibrium, what is the number of independent intrinsic properties needed ?

Solution:

From Gibb's phase rule
C + 2 = P + F
For pure substance C= 1
Phases present, P - 3
1 + 2 = 3 + F
F = 0

QUESTION: 6

Which one of the following represents the condensation of a mixture of saturated liquid and saturated vapour on the enthalpy-entropy diagram

Solution:

For Moiller diagram, condensation takes place at constant pressure which is along vertically inclined.

QUESTION: 7

Which of the following are pure substances?
1. Gaseous air
2. A mixture of gaseous air and liquid water
3. A mixture of liquid water and water vapour
4. A mixture of gaseous air and oil

Solution:

Example of pure substance:
1. Atmospheric air
2. Steam water mixture
3. Combustion products of a fuel

QUESTION: 8

The ordinate and abscissa in the given figure showing the saturated liquid and vapour regions of a pure substance represent.

Solution:
QUESTION: 9

Change of state, e.g., freezing, melting, evaporation and condensation, is an

Solution:
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