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EM unit I

Total questions: 30

Worksheet time: 30mins

Name
Class
Date
1.

Cooling curve is obtained by plotting ______________.

a)

(a) Time versus temperature

b)

(b) Temperature versus time

c)

(c) Time versus composition

d)

(d) Composition versus time

2.

During alloy solidification, the temperature is ______________.

a)

Constant

b)

Increases

c)

Decreases

d)

All of the above

3.

Before solidification, some amount of under-cooling occurs ______________.

a)

in an alloy

b)

in pure metal

c)

in tertiary alloy

d)

none of these

4.

Eutectic solid solidifies at ______________.

a)

varying temperature

b)

constant temperature

c)

Both constant and varying temperature

d)

None of the above

5.

Lever-arm rule is used for identifying ______________.

a)

Amount of phase

b)

Amount of temperature

c)

Amount of heat

d)

Solidifying temperature

6.

Number of degrees of freedom of a system in equilibrium condition is related to ___________.

a)

Temperature and pressure

b)

Only pressure

c)

Number of components and phases present

d)

Only temperature

7.

In a mono-variant system, the degrees of freedom is __________________.

a)

1

b)

0

c)

2

d)

4

8.

An example for two metals completely soluble in liquid state and partially soluble in solid state

is __________________.

a)

Copper–silver

b)

copper- zinc

c)

lead-tin

d)

gold-copper

9.

An example for two metals completely soluble in liquid and solid is ______________.

a)

copper-nickel

b)

lead-bismuth

c)

lead-tin

d)

all the above

10.

Bismuth and cadmium phase diagram is an example for ______________.

a)

Two metals completely soluble in liquid and solid states

b)

Two metals completely soluble in liquid state and partially soluble in solid state

c)

Two metals completely soluble in liquid state and insoluble in solid state

d)

All of the above

11.

In a eutectic reaction, ______________.

a)

Liquid transfers into two solids

b)

Liquid transfers into one solids

c)

Liquid transfers into three solids

d)

none

12.

Liquid phase reacts with a solid phase to give a different solid phase called ______________.

a)

Eutectic reaction

b)

eutectoid reaction

c)

peritectic reaction

d)

peritectoid reaction

13.

Eutectic composition refers to ______________.

a)

Two metals completely soluble in solid state

b)

Two metals partially soluble in solid state

c)

Two metals completely insoluble in solid state

d)

All of the above

14.

Eutectoid transformation is a ______________.

a)

Liquid to liquid transformation

b)

Solid to solid transformation

c)

Liquid to solid transformation

d)

None of the above

15.

Temperature at which eutectic composition solidifi es is known as ______________.

a)

Solidification temperature

b)

Peritectoid temperature

c)

Eutectic temperature

d)

Melting temperature

16.

Pure iron solidifies approximately at ___________________ degree Celsius

a)

1600

b)

1400

c)

1349

d)

1539

17.

Pure iron is nonmagnetic above ___________________ degree Celsius

a)

900

b)

1000

c)

768

d)

723

18.

Delta iron is in ___________________ crystal

a)

FCC

b)

HCP

c)

BCC

d)

None

19.

Maximum percentage of carbon soluble at 1,492°C in delta iron is ___________________ %

a)

0.2

b)

0.6

c)

0.8

d)

0.5

20.

Pure iron appears at room temperature in the form of ___________________.

a)

austenite

b)

pearlite

c)

ferrite

d)

cementite

21.

0.8% steel is also called as ___________________.

a)

Eutectic steel

b)

Eutectoid steel

c)

Hypereutectoid steel

d)

None of the above

22.

In iron carbon phase diagram, peritectic reaction occurs approximately at ____________ degree Celsius

a)

1567

b)

1559

c)

1420

d)

1492

23.

Eutectoid reaction takes place at ___________________.

a)

Below 723°C

b)

Above 723°C

c)

At 723°C

d)

At 1,147°C

24.

Pearlite is mechanical mixture of ___________________.

a)

Gamma iron and cementite

b)

Gamma iron and austenite

c)

Austenite and cementite

d)

None of the above

25.

4.33% cast iron is also known as ___________________.

a)

Eutectic cast iron

b)

Hypereutectic cast iron

c)

Hypoeutectic cast iron

d)

None of the above

26.

Solubility of carbon in a ferrite structure at room temperature is ___________________%

a)

0.02

b)

0.002

c)

0.008

d)

0.8

27.

Carbon in hypereutectic cast iron is between ___________________.

a)

2% and 4%

b)

4% and 6.675%

c)

2% and 6.67%

d)

None of the above

28.

The alloy of iron and 6.67% carbon appears as ___________________.

a)

100% cementite

b)

100% ledeburite

c)

100% austenite

d)

Mixture of all above

29.

Solubility of carbon in austenite at 1,147°C is ___________________ %

a)

0.8

b)

1.8

c)

2

d)

4.33

30.

Carbon appears in cast iron in the form of ___________________

a)

flake

b)

nodular

c)

combined

d)

cementite