The document appears to be a set of multiple choice questions related to metallurgy and materials. It includes questions about blast furnaces, smelting processes, alloying elements, types of steel and cement, and concentration and refining methods. The questions have options A through D and indicate the correct answer.

1. Sr No Question Option A Option B Option C Option D ANSWER
12
In a Blast furnace the temperature range in Zone
of reduction is _______
d
300 Degree
Celsius to 1000
1000 Degree
Celsius to 1300
1300 Degree
Celsius to 1500
1500 Degree
Celsius to 2000
300 Degree
Celsius to 1000
16
In smelting process _______ is used as a
reducing agent.
d carbon zinc aliminium flux carbon
19
Identify the concentration process of ore from
the given figure
d
magnetic
separation
roasting
Froth flotation
process
calcination
Froth flotation
process
26
Slag is an fusible material formed by
combination of...
d Flux + ore Flux + mineral Flux + gaunge Flux + metal Flux + gaunge
29
Name the Furnace which is 30 to 40 meters in
Height & is heated by hot air coming from twyer
d Blast furnace Muffle furnace
Reverberatory
Furnace
Heating Furnace Blast furnace
38
The method of refining of a metal involving use
of a green log of wood is ______
d Liquation ELectrorefining Distillation Poling Poling
39
Name the refining method used for Low melting
point & volatile metals .
d Liquation ELectrorefining Distillation Poling Distillation
54
The concentration process of ore based on the
principle of difference in wetting characteristics
d
gravity
separation
roasting calcination froth floatation froth floatation
56 Smelting process is carried out in ....... d Muffle furnace Blast furnace
Reverberatory
furnace
Bessemer
converter
Blast furnace
90
The Molten Iron obtained from Blast furnace is
called ....
d Pure Iron pig Iron wrought Iron Blister Iron pig Iron
91
"a", "b" and "c" in the given figure
represents____.
d
a.zone of
reduction , b.
a.zone of fusion ,
b. zone of heat
a.zone of
reduction ,
a. zone of heat
absorption ,
a.zone of
reduction , b.
110 Refractory materials are used in........ d
linings of
furnaces.
binding of metals
purifying of
metal
alloying
linings of
furnaces.
14
The zone of Heat Absorption in Blast furnace has
temperature range _______
d
300 Degree
Celsius to 1000
800 Degree
Celsius to 1300
1300 Degree
Celsius to 1500
1500 Degree
Celsius to 2000
800 Degree
Celsius to 1300
15
The zone of Fusion in blast furnace has
temperature range __________
d
300 Degree
Celsius to 1000
1000 Degree
Celsius to 1300
1200 Degree
Celsius to 1500
1500 Degree
Celsius to 2000
1200 Degree
Celsius to 1500
...........used as flux in blast furnace
d CaO SiO2 CaCl2 SiO3
Match the pair
d A-1, B-2, C-3 A-2, B-1, C-3 A-2, B-3, C-1 A-3, B-2, C-1
Region of blast furnace at diameter of funcace become maximum is known as -------
d head body bosh hearth
Lead [Pb] and Tin [Sn] refined by ------- method
d Liquiation Distillation Poling Electrorefining
GURU GOBIND SINGH POLYTECHNIC, NASHIK
SEM-II APPLIED CHEMISTRY (22202)
MCQS FOR FINAL ONLINE EXAM
1. METALLURGY,CEMENT,LIME,REFRACTORIES

2. Zinc [Zn] and Mercury [Hg] refined by ------- method
d Liquiation Distillation Poling Electrorefining
If impurity has strong affinity toward oxidation then we perform ------- refining method
d Liquiation Distillation Poling Electrorefining
pure metal converts into extra pure metal known as ----------
d Reduction Crushing Refining pulverization
identify
d Liquiation Distillation Poling Electrorefining
identify
d Liquiation Distillation Poling Electrorefining
identify
d Liquiation Distillation Poling Electrorefining
------ process takes place in blast furnace
d concentration calcination smelting pulverization
Maximum temperature of blast furnaces reaches upto ------
d
300 Degree
Celsius
800 Degree
Celsius
1200 Degree
Celsius
1500 Degree
Celsius
impurity stuck on slopping surface of hearth in liquiation process of refining is known as --------
d dross sludge slag flux
20
Haematite ore is physically concentrated
by...............
d
froth flotation
process
gravity
separation
calcination
process
Roasting process
gravity separation
process
24
The mineral from which metal is extracet
economically & profitably is called as....
d ore flux slag gaunge ore
25
During extraction of metal ,the earthy impurities
present in ore are called as.....
d minreals gaunge slag flux gaunge
27
The device which is used for heating purpose,
during extraction of metals is called________
d Burner furnace Vessel container furnace
31
Name the process of physical concentration of
ore, which is based on the principle of difference
d
Gravity
separation
Magnetic
Separation
Froth flotation Reduction
Gravity
separation
32
Name the process of physical concentration of
ore, which is based on the principle of difference
d
Gravity
separation
Magnetic
Separation
Froth floatation Reduction
Magnetic
Separation
33
Name the process used for the physical
concentration for Sulphide ores.
d
Gravity
separation
Magnetic
Separation
Froth flotation Reduction Froth flotation
34
Physical concentration of sulphide form of ore is
done by __________ method.
d froth flotation roasting
gravity
separation
calcination froth flotation
35 The ore of iron is ______ d tinstone haematite galena bauxite haematite
36
The process of heating the ore in the presence of
Excess of air to a temperature below its melting
d Calcination Reduction Roasting Smelting Roasting
37
The chemical concentration of sulphide ore of
copper is done by ___________.
d Smelting calcination
Electrolytic
reduction
roasting roasting
139
Identify the process of concentration of ore on
the basis of density
d
Gravity
separation
calcination
magnetic
separation
roasting
Gravity
separation
147
Identify the process of concentration of ore with
electromagnetic roller
d
froth flotation
process
Magnetic
separation
gravity
separation
calcination
Magnetic
separation
160 Fe2O3 IS Chemical formula of d Magnetite Limonite Azurite Haematite Haematite
171
Tinstone ore is physically concentrated by...…d
froth flotation
process
gravity
separation magnetic
Roasting process

3. 172
In magnetic separation method magnets are used to separate _ _ _
d Mineral and ore
Ore and
impurity
Mineral and
metal
Ore and flux
173
Heating of an ore in presence of air/oxygen known as _ _ _ _ _ *
d Calcination Concentration Roasting Reduction
174
Heating of an ore in absence of air/oxygen known as _ _ _ _ _ *
d Calcination Concentration Roasting Reduction
175
Among the given ores, which one is NOT
a ore of copper? *
d Copper pyrite Haematite Malachite Cuprite
176
Removal of volatile impurity in Roasting _ _ _ _ _
d CO2 CO SO2 SO3
177
method is exclusively used only when pure ore is magnetic and impurity is non magnetic
d
Froth flotation
process
Gravity
separation
Magnetic
separation
Roasting
process
178
Removal of volatile impurity in Calcination _ _ _ _ _
d CO2 CO SO2 SO3
179
If Carbonate ores converts into oxide ores, then method is_ _ _ _
d Calcination Concentration Roasting Reduction
180
Iron pyrite FeS2 , Copper pyrite CuFeS2 , Galena PbS ore is physically concentrated by...…
d
Froth flotation
process
Gravity
separation
Calcination
process
Roasting
process
181
If Sulphide ores converts into oxide & Sulphate ores, then method is_ _ _ _
d Calcination Concentration Roasting Reduction
182
Out of which is not ore of Fe
d Haematite Iron Pyrite Limonite Bauxite
183
The naturally occurring substance from which metal can be extracted economically is known as...…..
d Mineral Ore Gangue Flux
184 Correct sequence of metallurgy process is d
Crushing&
Pulverization,
Crushing&
Pulverization,
Crushing&
Pulverization,
Concentration,
Crushing&
1
The naturally occuring substance from which
metal can be extracted economically is known
d Mineral Ore Gangue Flux Ore
2
The Percentage of carbon in medium carbon
steel is.....
ALLOY 1.5 to 2.5 % 0.05 to 0.03 % 0.3 to 0.6 % 0.6 to 1.3 % 0.3 to 0.6 %
3
The Percentage of Carbon in low carbon steel
is......
ALLOY 0.05 -0.3 % 0.60% 0.6-0.8% 0.3-0.6% 0.05 -0.3 %
4
The percentage of carbon in High carbon steel
is.....
ALLOY 0.3-0.6% 0.6-1.5% 1.5 to 2.5 % 0.6-0.8% 0.6-1.5%
5
Name the property of metal by virtue of which it
can be drawn into wire .
pr Malleability Ductility Hardness Brittleness Ductility
6
Fusible mass called slag is formed on reaction
between.......
D mineral and flux ore and flux gangue and flux metal and flux gangue and flux
8
Wood's metal is used for making safety plugs of
pressure cookers, sprinklers, fire alarms because
ALLOY hard and tough highly magnetic
highly resistant
to surface wear
easily fusible easily fusible
9 Tinman Solder is the alloy of.... ALLOY Lead and Tin Copper and TIn
Aluminium and
Tin
Zinc and Tin Lead and Tin
10
A type of steel is called Stainless steel because of
it's .....
ALLOY boiling point appearence melting point
high corrosion
resistance
high corrosion
resistance
11
-------------- is generally made up of from high
carbon steel .
ALLOY wires hammer rolled sheets condenser tubes hammer
13 optiona o

4. 17 Muffle furnace is used for the purpose of .... mf
Reduction of iron
ores
extraction of
copper
refining of metal
research facility
in laboratories
research facility
in laboratories
18
The desired temperature in the Muffle furnace is
attained by heating with......
mf
electrical heating
coil
hot blast of air
using coke as
fuel
Bunsen burner
electrical heating
coil
21 1- a, 2-c, 3-b, 4-d o 1- d, 2-c, 3-a, 4-b
1- c, 2-ca, 3-d, 4-
b
1- b, 2-a, 3-c, 4-d optionb
22 1- d, 2-a, 3-b, 4- c o 1- b, 2-c, 3-d, 4- a 1- c, 2-b, 3-a, 4-d 1- a, 2-b, 3-d, 4-c optiona
23 1-d, 2-b, 3-c, 4-a o 1-a, 2-b, 3-c, 4-d 1-d, 2-a, 3-b, 4-c 1-b, 2-a, 3-c, 4-d optionc
28
Name the furnace which is oven like and is
heated by external source of current.
mf Blast furnace
Reverbratory
furnace
Muffle furnace Heating furnace Muffle furnace
30 Name the given furnace. mf Muffle furnace
Reverbratory
furnace
Blast furnace Heating furnace Muffle furnace
40 Chemical formula of cuprite ore is Cu Cu2O CuO CuFeS2 FeO Cu2O
41 Copper matte is a mixture of.... Cu
cuprous Sulphide
+ Ferrous
cupric Sulphide +
Ferrous Sulphide
cuprous Sulphide
+ Ferric Sulphide
cupric Sulphide +
Ferric Sulphide
cuprous Sulphide
+ Ferrous
42
During the extraction of Copper from Copper
pyrite ore, the most important step in which
Cu Smelting Bessemerisation Poling Electrorefining Bessemerisation
43
During electro-refining of copper the pure
copper metal is obtained from.....
Cu Anode electrode
Cathode
electrode
Anode Mud
electrolytic
solution
Cathode
electrode
44
The property of metal by virtue of which it can
be hammered into sheet is known as ....
pr Ductility Malleability Toughness Hardness Malleability
45
Hardness is the property of metal/alloy to resist
....
pr Wear & Abrasion
Breaking &
cracking
Shocks &
vibrations
castability Wear & Abrasion
46 1-a, 2-c, 3-d, 4- b o 1-c, 2-d, 3-b, 4- a 1-b, 2-a, 3-c, 4- d 1- d, 2-b, 3-a, 4-c optionb
47 1- b, 2-a, 3-d, 4-c o 1- a, 2-c, 3-b, 4-d 1- c, 2-a, 3-d, 4-b 1- d, 2-a, 3-b, 4-c optiona
48 Brass is an alloy of __________ ALLOY copper + tin copper + zinc
copper +tin +
zinc
zinc + tin copper + zinc
49
The alloying element which increases the tensile
strength of pure Iron is_______---
ALLOY Carbon Silicon Magnesium Chromium Carbon
50
The alloying element which increases the tensile
strength of iron is------------
ALLOY Carbon Silicon Magnesium Chromium Carbon
51 #NAME? o Brass duralumin woods metal tinmanns solder woods metal
52 #NAME? o Carbon Dioxide Iron oxide Copper oxide Nitrogen oxide Iron oxide
53 Identify the given figure- o Combustion tube
Otto Hofmann's
oven
Bomb
Calorimeter
Fractional
distillation
Bomb
Calorimeter
55
The sulphide ores are concentrated by froth
flotation as it is based on the principle of........
d
difference in
densities of ore
difference in
wetting
difference in
magnetic
difference in
preference to get
difference in
wetting
57
Compression method for preparation of alloy
involves.....
ALLOY
Simultaneous
deposition of
melting the
metal and adding
Reduction of one
metal ore in
mixing
component in
mixing
component in
58
Name the method for preparation of alloy in
which the metals are heated to their melting
ALLOY Fusion method
Electrodepositio
n method
Reduction
method
Compression
method
Fusion method

5. 59
Name the method of preparation of alloy in
which a mixture of two or more powdered
ALLOY Fusion method
Electrodepositio
n method
Compression
method
Reduction
method
Compression
method
60
The method used for the preparation of Wood's
metal is ______
ALLOY Fusion method
Electrodepositio
n method
Reduction
method
Compression
method
Compression
method
61
__________ method is used for the preparation
of Brass and Bronze alloy.
ALLOY Fusion
Electrodepositio
n
Reduction Compression Fusion
62
The ingredient used as binder in concrete
mixture is ??.
cement gravel cement water sand cement
75 The chemical formula of Lime is________ lime CaO CaO
64
A self healing material used to enhance
durability of building structure is _______
cement portland cement lime refractories biocement biocement
65
The process of hardening & setting of Hydraulic
cement is due to_______ reaction
cement oxidation carbonation decomposition
hydration &
hydrolysis
hydration &
hydrolysis
66
The process of hardening & setting of lime is due
to?..
cement Decomposition Reduction
Hydration &
hydrolysis
Carbonation Carbonation
67 #NAME? cement ordinary cement
Rapid hardening
cement
Portland cement Biocement Biocement
68
------------------ cement provide chemical
resistance ,to be used for construction of water
cement
Rapid hardening
cement
Portland cement ordinary cement white cement Portland cement
69
Rapid Hardening cement can be used for
construction of........
cement water dam
interior facing of
walls
pavement
Beams &
columns
Beams & columns
70 #VALUE! 0 Calcium Oxide Aluminium Oxide Carbon dioxide Iron Oxide Carbon dioxide
71
On mixing cement & water a hard rigid mass is
formed due to initial gel formation which is
cement
Clinker of
cement
Hardening of
cement
Setting of
cement
Hardening and
setting of
Setting of cement
72
On mixing cement & water ,a hard rigid mass is
formed which gradually changes into compact
cement
Hardening of
cement
clinkering of
cement
Setting of
cement
slaking of
cement
Hardening of
cement
73
Name the cement which is used as Eco-
construction Material.
cement coloured cement portland cement Bio -cement white cement Bio -cement
74
From the following, which statement is incorrect
for bio cement ?
cement
it is eco-
contruction
it increases
compressive
it is very efficent
compared to
it evolves large
amount of
it evolves large
amount of carbon
78 Slaked lime is formed when lime is mixed with?.. lime water carbondioxide air
calcium
carbonate
water
138 If lime is added in excess quantity ,it will.......... lime
cause cement to
expand and
control initial
setting time.
lower clinkering
temperature
give strength to
cement
cause cement to
expand and crack.
148 Lime is prepared by _____________ lime Calcination Calcination
152
The cementing action of lime depends on the
rate of____________
lime hydrolysis hydration carbonation evaporation carbonation
79
From the following, which statement is not true
for Refractories.
rf
it should be
chemically stable
it should be
physically stable
it should be
thermally
it should be
mechanically
it should be
thermally
80 An alloy used in making parts of aeroplane is..... ALLOY Brass Duralumin stainless steel Gun metal Duralumin
81 An alloy used as casting for dental work is.... ALLOY Tinman's solder Brass Duralumin Wood's metal Wood's metal
82
Purification of copper is done by.............process
to get high purity metal.
Cu Liquation Electrolysis Distillation Aluminothermic Electrolysis

6. 83
Refractories are materials which have the
property to withstand .....
rf High moisture
High
temperature
High Resistance High pressure High temperature
84 CuFeS2 IS CHEMICAL FORMULA Cu Copper glance Azurite Cuprite Copper pyrite Copper pyrite
85 Acidic refractories contains____ rf Graphite MgO
86
Among the following, ________ is a Basic
refractory.
rf CaO CaO
87 The porosity of a good Refractory should be.... rf low High medium very high low
88
Refractory should possess the ability to be
perfectly ---------
rf conducting isolating isobaric
Fused at
conditions of
isolating
154 Lime is also used as ____________in metallurgy. lime reducing agent flux oxidising agent retarder flux
92
Iron metal is used of making heavy machines due
to the property of ......
pr Ductility Hardness mellability brittleness Hardness
93
The refractoriness of refractory materials should
be....
rf High low moderate None of these High
94
Refractoriness is the ability of refractory material
to withstand high________
rf pressure moisture heat reactivity heat
95
Among the following------------- is not a neutral
refractory.
rf Aluminium oxide Graphite Zirconia Chromite Aluminium oxide
96
In which of the following application gypsum is
used.
cement Plastering of wall
Reduction of
metal
Slaking of lime
Thermal
expansion of
Plastering of wall
97
Name the type of steel used for making cutting
tools.
ALLOY low carbon steel High carbon steel
Medium carbon
steel
Mild steel High carbon steel
98
The steel used for making axle shafts ,gearing
plates are....
ALLOY low carbon steel High carbon steel
Medium carbon
steel
Heat resistance
steel
Medium carbon
steel
99
The low melting point alloy of tin and lead is
______
ALLOY brass woods metal bronze tinmann's solder tinmann's solder
101
The melting temperature of refractory material
should be well----------the operating temperature
rf Below Above Equal Moderate Above
102 _____ is an example of neutral refractory. rf Bauxite Magnesite quartz dolomite Bauxite
103
On the basis of chemical composition
refractories are classified as___________
rf
Acidic , basic ,
neutral
oxide, sulphide,
carbonate
ferrous and non
ferrous
High refractory
and Super
Acidic , basic ,
neutral refractory
104
The example of Acidic refractory materials is
...........
rf
Magnesium
oxide
calcium oxide Silica Chromite Silica
105
Basic refractories are made up of basic material
such as...........
rf Alumina Fire clay Silicon Carbide Quartz Alumina
106 optiona o
107
From the following-------------- is the example of
neutral refractory.
rf Alumina Magnesia Zirconia Bauxite Zirconia
108 A good refractory should have ________ rf Low porosity Medium porosity High porosity
large size
porosity
Low porosity
109
The effect of high porosity on the Refractory
is......
rf
decrease in its
density and
increase in the
resistance to
has no effect on
it.
increases the life
of refractory
decrease in its
density and

7. 111
The sudden change in operating temperature in
a refractory causes ______
rf
increase in load
bearing strength
increase in
porosity
thermal spalling
high electrical
conducitivity
thermal spalling
112
The effect of high temperature on the shape and
size of refractory material is it ________
rf
contract at high
temperature
expand at high
temperature
deform at high
temperature
remain stable at
high
remain stable at
high temperature
113 #NAME? o Alloys Metals
Alumina and
silica
cement Alumina and silica
114
Refractory materials are used in chemical
industries that require high temperature for
rf
they are highly
chemically active
they are
chemically inert
high electrical
conductivity
high porosity
they are
chemically inert
115
The load bearing capacity of refractory should
be.........
rf High Low
Depending on
temperature.
Constant. High
116
On alloying gold and silver with copper, it
increases their ________________
ALLOY tensile strength weldability softness hardness. hardness.
117
The melting point of an alloy is lower than the
pure metal because......
ALLOY
alloying element
has low melting
alloying element
acts as impurity
alloying element
is in high
alloying element
is non metal.
alloying element
acts as impurity
118 Machinability is the ability of metal to ......... pr
Cut into any
desired shape
to have good
fluidity
to resist
deformation
to resist shocks
or vibration.
Cut into any
desired shape
119
The property by virtue of which metal gets a
desired shape by pouring a molten metal into a
pr Castability Brazing malleability Specific gravity Castability
120
The process of joining two or more metals by
using non ferrous alloy between them is known
pr Welding melting alloying brazing brazing
121
The property which describes the heaviness or
lightness of the metals is known as...........
pr Toughness Refractoriness
Fatigue
resistance
Specific gravity Specific gravity
122
The ability of metal to resist weakening and
structural damage by repeatedly applied loads is
pr Tensile strength Brazing Stiffness
Fatigue
resistance
Fatigue resistance
123 Hardness of metal is__________ pr
An ability of
metal to resist
An ability to
carry load
An ability to
deform under
An ability to
resist shocks or
An ability of
metal to resist
124 Toughness is an ability of a metal to ------------ pr
resist permanent
shape change or
carry load
without breaking
deform under
pressure.
resist shocks or
vibrations.
resist shocks or
vibrations.
125 Tensile strength is----------- pr
An ability of
metal to resist
An ability to
carry load
An ability to
deform under
An ability to
resist shocks or
An ability to carry
load without
126
The ability of substance to absorbs or release
energy is ----------
pr
Specific
resistance
Specific gravity Specific heat Specific density Specific heat
127
Fatigue occurs when the material is subjected to
repeated loading and unloading which
pr
weakening and
structural
low density
increase in
stiffness
solidification
weakening and
structural
128 Wood's metal has...... ALLOY
high melting
point
high tensile
strength
low melting
point.
Low corrosion
resistance
low melting
point.
129
Name the furnace in which heating is done by
Blast of Hot air.
d Blast Furance Muffle Furnace
Reverberatory
furnace
Retort Blast Furance
130
An alloy of iron, ------- is preferred over pure Iron
for machines construction.
ALLOY steel Aluminium Copper Tin steel
131
For making rivets, bolts and nails which of the
following alloy is used ?
ALLOY High carbon steel Tinman's solder low carbon steel Wood's metal low carbon steel
132 a)-ii , b)-iv, c)- i) , d)- iii) o
a)-iii ,b)-iv , c)- ii)
,d)- i)
a)-iii , b)-i , c)- ii)
,d)- iv)
a)-i b)-iv c)- iii) d)-
ii)
optionb
133 #NAME? ALLOY Duralumin low carbon steel
Medium carbon
steel
High carbon steel High carbon steel
134 Select the ferrous alloy among the following- ALLOY Tinman's solder Duralumin Brass Stainless steel Stainless steel

8. 135
The chemical ingredient of cement which
provides colour to the cement is
cement Alumina lime silica iron oxide iron oxide
136 The function of Gypsum in cement is to......... cement
lower the
clinkering
giving strength
controlling initial
setting time of
provide colour.
controlling initial
setting time of
137
Identify the component which when added in
excess amount in cement causes slow setting of
cement Iron oxide Alumina Lime Silica Silica
155 Slaking of lime is................ reaction lime Endothermic Exothermic Sublimation Reduction Exothermic
140
The presence of tricalcium silicate in the cement
________________
cement
hardens cement
readily
causes cement to
expand and
generates less
heat of
lowers clinkering
temperature of
hardens cement
readily
141
The presence of iron oxide in the
cement_______________
cement
provides colour
to the cement
hydrates the
cement slowly.
causes initial
setting of
generates more
heat of
provides colour
to the cement
142
The effect of tricalcium aluminate in cement
is___________
cement
to cause initial
setting of
cement
provide colour to
the cement
harden the
cement slowly.
generate less
heat of hydration
to cause initial
setting of cement
143
Most of the heat liberated during hydration of
portland cement is due to _______
cement dicalcium silicate
tetra calcium
aluminoferrite
dicalcium
aliuminate
tricalcium
aluminate
tricalcium
aluminate
144
Tricalcium silicate develops strength in cement
in___________days
cement 28 7 2 1 7
145 Gypsum is added to cement to______________ cement
prolong
hydration.
decrease
strength after
hydration
decrease heat of
hydration
reducing curing
time
prolong
hydration.
146
Chemical formula of gypsum is
________________
cement CaSO4,2H2O CaSO4,2H2O
156
________ is used for water purification, refining
of sugar and in refractories.
lime cement Lime duralumin brass Lime
157 Reaction of quick lime and water is called…… lime Cementing Slaking Hardening Setting Slaking
63
The lime having maximum percentage of CaO in
it is _______
lime dolomite lime lean lime fat lime hydraulic lime fat lime
151 optionb o
76 The Percentage of "CaO" in Fat lime is?? lime
Greater than
90%
60-70% 70-80% Less than 50% Greater than 90%
77 One of the type of hydraulic lime is _________ lime fat hydraulic lime
Quick hydraulic
lime
eminently
hydraulic lime
poor hydraulic
lime
eminently
hydraulic lime
89
A Mason has to Plaster the walls ,he will select
which type of lime for this work?
lime Fat lime poor lime Hydraulic lime
feebly hydraulic
lime
Fat lime
149 Percentage of Calcium oxide in Fat lime is....... lime 70-80 % 60-70 % 80-90 % 95-98 % 95-98 %
150
----------------- contains 60-70 % CaO and 30-40 %
MgO
lime Fat lime Lean Lime Dolomite lime Hydraulic lime Dolomite lime

9. 153
Name the lime that has high percentage of clay
in it.
lime
Eminently
hydraulic lime
Moderately
hydraulic lime
feebly hydraulic Dolomite
Eminently
hydraulic lime
158
The process of heating the ore strongly in the
absence of air is known as................
d Calcination Roasting
Aluminothermic
process
Smelting Calcination
159
Hardness of Gold can be increased by alloying it
with ______
ALLOY Cu Mg Ca Al Cu
161
Among the given ores, which one is NOT a ore of
copper?
Cu copper pyrite haematite malachite cuprite haematite
162 CuFeS2 IS CHEMICAL FORMULA Cu Copper glance Malachite Copper pyrite optionc Copper pyrite
163
Ferrous alloys are those alloys which contain
base metal as...
ALLOY Copper Iron Lead Aluminium, Iron
164 Non-Ferrous alloys is... ALLOY carbon steel Stainless Steel Duralumin Steel Duralumin
165 Alloys are made to lower the ...... of metal. ALLOY tensile strength
corrosion
resistance
melting point toughness melting point
166
The role of gypsum added in cement is to control
the rate of ??.
cement
Hardening &
setting
softening setting only hardening only
Hardening &
setting
167
The type of refractories that are NOT attacked by
acidic or basic material are made up of ______
rf
carborundum or
chromite
alumina Silica
Magnesium
oxide or Calcium
oxide
carborundum or
chromite
168
A good refractory should have following
property__________
rf high porosity
high load bearing
strength
high electrical
conductivity
high chemical
reactivity
high load bearing
strength
169
Refractories of low thermal conductivity are
mostly used in
rf Blast furnace Muffle furnace Retorts Recoperators Blast furnace
170
The amount of heat per unit mass required to
raise the temperature of substance by one
degree Celsius is known as...........
pr Specific gravity Specific heat Specifi density
Specific
resistance
Specific heat
291 both (A) and (B) O optiona