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A231 Phase diagramme

Total questions: 42

Worksheet time: 32mins

Name
Class
Date
1.

What determines the states of matter a material is in?

a)

solid

b)

liquid

c)

temperature

d)

gas

2.

----------------------------------------------is a tool used to determine weight percent ages of each phase of a binary equilibrium phase diagram.

a)

Lever Rule

b)

Gibbs phase Rule

c)

Hume Rothery

d)

None of them

3.

----------------------------------------------is a tool used to determine weight percent ages of each phase of a binary equilibrium phase diagram.

a)

Lever Rule

b)

Gibbs phase Rule

c)

Hume Rothery

d)

None of them

4.

Some metals, as well as non metals, may have more than one crystal structure, a phenomenon known as

a)

Polymorphism

b)

Allotropy

c)

Solid Solution

d)

Random Oriented Solution

5.

Both the components are mutually soluble in each other in both liquid and solid phase

a)

Isomorphous System

b)

Binary Isomorphous System

c)

Unary Isomorphous System

d)

None of them

6.

Systems composed of two or more phases are termed “mixtures” of

a)

Heterogeneous systems

b)

Homogeneous system

c)

Isomorphous

d)

Allotropy

7.

--------- helps determine the maximum number of phases present in an alloy system under equilibrium conditions at any point in a phase diagram.

a)

Gibbs Phase Rule

b)

Lever Rule

c)

None of them

8.

The following is WRONG about a phase diagram

a)

It gives information about transformation rates

b)

Relative amount of different phases can be found under given equilibrium conditions

c)

It indicates the temperature at which different phases starts to melt

d)

Solid solubility limits are depicted by it.

9.

What is the microstructure at A

a)

Pearlite

b)

Bainite

c)

Martensite

d)

Austenite

10.
Which phase change would require the atoms and molecules of a substance to move faster?
a)
Condensation
b)
Evaporation
c)
Freezing
d)
Deposition
11.
What is condensation?
a)
gas to solid
b)
gas to liquid
c)
liquid to solid 
d)
solid to liquid 
12.

Temperature at which a liquid changes to a solid

a)

Evaporation

b)

Melting

c)

Freezing point

d)

Sublimation

13.

Phase change of a liquid to a solid

a)

Freezing

b)

Sublimation

c)

Condensation

d)

Melting

14.

Phase change of a solid directly to a gas

a)

Condensation

b)

Freezing point

c)

Sublimation

d)

Vaporitzation

15.

Martensite is

a)

Soft

b)

Ductile

c)

Annealed

d)

Hard

16.

The structure of austenite is

a)

FCC

b)

BCC

c)

SC

d)

None

17.

The structure of alpha ferrite is

a)

FCC

b)

BCC

c)

HCP

d)

None

18.

Which one is the correct sequence of structure formation in age hardening?

a)
b)
c)
d)
19.

Which of the following structure will form at the point marked as red on the figure

a)
b)
c)
d)
20.

The reaction in the figure is called

a)

Eutectic

b)

Peritectoid

c)

Monotectic

d)

Eutectoid

21.

Which one is a better design in dispersion strengthening?

a)

A

b)

B

c)

Both

d)

None

22.

Which one is a better design in dispersion strengthening?

a)

A

b)

B

c)

Both

d)

None

23.

Degrees of freedom for a triple point on the phase diagram are

a)

0

b)

1

c)

2

d)

3

24.

Solvus is a line on the phase diagram which differentiates between

a)

a liquid and a solid

b)

different liquids

c)

different solids

d)

None

25.

In Gibbs phase rule (2+C=F+P), 2 in the equation implies which of the following two can be changed independently

a)

Pressure and Composition

b)

Pressure and Temperature

c)

Temperature and Composition

d)

None

26.
What change occurs from E to C?
a)
sublimation
b)
freezing
c)
melting
d)
boiling
27.
Water exists as a _____________ at 3 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
28.
What would happen if the gaseous substance with a pressure of 10-3 atmospheres were cooled until a phase change occurred?
a)
condensation
b)
vaporization
c)
sublimation
d)
deposition
29.
Above the temperature and pressure of point B, this substance exists as a ____________.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
30.
Water exists as a _____________ at 700 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
31.
What is the normal melting point of this substance?
a)
150 °C
b)
100 °C
c)
-50 °C
d)
0 °C
32.
What is the normal boiling point of this substance?
a)
150 °C
b)
100 °C
c)
-50 °C
d)
0 °C
33.
What would happen to the liquid substance if the pressure were decreased until a phase change occurred? It would undergo...
a)
melting
b)
vaporization
c)
condensation
d)
sublimation
34.
What is true regarding CO2 for temperatures above 31 °C?
a)
It can never be liquified.
b)
It decomposes.
c)
It has a high pressure.
d)
It is a plasma.
35.
The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg.  In order, what changes occur?
a)
deposition, melting
b)
sublimation, melting
c)
condensation, freezing
d)
deposition, freezing
36.
What change occurs from C to D?
a)
condensation
b)
vaporization
c)
melting
d)
sublimation
37.
What change occurs from F to E?
a)
sublimation
b)
deposition
c)
melting
d)
condensation
38.
What is point B?
a)
triple point
b)
critical point
c)
equilibrium point
d)
normal melting point
39.
What is point A?
a)
triple point
b)
critical point
c)
equilibrium point
d)
normal melting point
40.
What state of matter is Z?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
41.
What state of matter is Y?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
42.
What state of matter is X?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid

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