NEW
Font size
WorksheetsEM unit I
Total questions: 30
Worksheet time: 30mins
Cooling curve is obtained by plotting ______________.
(a) Time versus temperature
(b) Temperature versus time
(c) Time versus composition
(d) Composition versus time
During alloy solidification, the temperature is ______________.
Constant
Increases
Decreases
All of the above
Before solidification, some amount of under-cooling occurs ______________.
in an alloy
in pure metal
in tertiary alloy
none of these
Eutectic solid solidifies at ______________.
varying temperature
constant temperature
Both constant and varying temperature
None of the above
Lever-arm rule is used for identifying ______________.
Amount of phase
Amount of temperature
Amount of heat
Solidifying temperature
Number of degrees of freedom of a system in equilibrium condition is related to ___________.
Temperature and pressure
Only pressure
Number of components and phases present
Only temperature
In a mono-variant system, the degrees of freedom is __________________.
1
0
2
4
An example for two metals completely soluble in liquid state and partially soluble in solid state
is __________________.
Copper–silver
copper- zinc
lead-tin
gold-copper
An example for two metals completely soluble in liquid and solid is ______________.
copper-nickel
lead-bismuth
lead-tin
all the above
Bismuth and cadmium phase diagram is an example for ______________.
Two metals completely soluble in liquid and solid states
Two metals completely soluble in liquid state and partially soluble in solid state
Two metals completely soluble in liquid state and insoluble in solid state
All of the above
In a eutectic reaction, ______________.
Liquid transfers into two solids
Liquid transfers into one solids
Liquid transfers into three solids
none
Liquid phase reacts with a solid phase to give a different solid phase called ______________.
Eutectic reaction
eutectoid reaction
peritectic reaction
peritectoid reaction
Eutectic composition refers to ______________.
Two metals completely soluble in solid state
Two metals partially soluble in solid state
Two metals completely insoluble in solid state
All of the above
Eutectoid transformation is a ______________.
Liquid to liquid transformation
Solid to solid transformation
Liquid to solid transformation
None of the above
Temperature at which eutectic composition solidifi es is known as ______________.
Solidification temperature
Peritectoid temperature
Eutectic temperature
Melting temperature
Pure iron solidifies approximately at ___________________ degree Celsius
1600
1400
1349
1539
Pure iron is nonmagnetic above ___________________ degree Celsius
900
1000
768
723
Delta iron is in ___________________ crystal
FCC
HCP
BCC
None
Maximum percentage of carbon soluble at 1,492°C in delta iron is ___________________ %
0.2
0.6
0.8
0.5
Pure iron appears at room temperature in the form of ___________________.
austenite
pearlite
ferrite
cementite
0.8% steel is also called as ___________________.
Eutectic steel
Eutectoid steel
Hypereutectoid steel
None of the above
In iron carbon phase diagram, peritectic reaction occurs approximately at ____________ degree Celsius
1567
1559
1420
1492
Eutectoid reaction takes place at ___________________.
Below 723°C
Above 723°C
At 723°C
At 1,147°C
Pearlite is mechanical mixture of ___________________.
Gamma iron and cementite
Gamma iron and austenite
Austenite and cementite
None of the above
4.33% cast iron is also known as ___________________.
Eutectic cast iron
Hypereutectic cast iron
Hypoeutectic cast iron
None of the above
Solubility of carbon in a ferrite structure at room temperature is ___________________%
0.02
0.002
0.008
0.8
Carbon in hypereutectic cast iron is between ___________________.
2% and 4%
4% and 6.675%
2% and 6.67%
None of the above
The alloy of iron and 6.67% carbon appears as ___________________.
100% cementite
100% ledeburite
100% austenite
Mixture of all above
Solubility of carbon in austenite at 1,147°C is ___________________ %
0.8
1.8
2
4.33
Carbon appears in cast iron in the form of ___________________
flake
nodular
combined
cementite
