Depth of hardness of steel is increased by addition of
Nickel
Chromium
Tungsten
Vanadium
Correct Answer :
B. Chromium
Related Questions
Paramagnetic alpha iron changes to gamma iron at
770°C
910°C
1440°C
1539°C
Y-alloy contains
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
Monel metal contains
63 to 67% nickel and 30% copper
88% copper and 10% tin and rest zinc
Alloy of tin, lead and cadmium
Malleable iron and zinc
The property of a material due to which it breaks with little permanent distortion, is called
Brittleness
Ductility
Malleability
Plasticity
Pick up wrong statement about wrought iron
It contains carbon of the order of 0 to 0.25%
It melts at 1535°C
It is very soft and ductile
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling.
German silver contains
1% silver
2.5% silver
5% silver
10% silver
Silicon when added to copper improves
Machinability
Hardness
Hardness and strength
Strength and ductility
The transistor is made of
Silver
Gold
Copper
Germanium
Manganese in steel increases its
Tensile strength
Hardness
Ductility
Fluidity
Beryllium bronze has
High yield point
High fatigue limit
Both (A) and (B)
None of these
The hardness of steel primarily depends on
Percentage of carbon
Percentage of alloying elements
Heat treatment employed
Shape of carbides and their distribution in iron
Connecting rod is, usually, made from
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
A material is said to be allotropic, if it has
Fixed structure at all temperatures
Atoms distributed in random pattern
Different crystal structures at different temperatures
Any one of the above
The coordination number of a face centred cubic space lattice is
Six
Twelve
Eighteen
Twenty
The alloy, mainly used for corrosion resistance in stainless steels is
Silicon
Manganese
Carbon
Chromium
The percentage of carbon in pig iron varies from
0.1 to 1.2%
1.5 to 2.5%
2.5 to 4%
4 to 4.5%
Free carbon in iron makes the metal
Soft and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
In nodular iron, graphite is in the form of
Cementite
Free carbon
Flakes
Spheroids
Tungsten in steel
Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves cutting ability and reduces hardenability
Gives ductility, toughness, tensile strength and anticorrosion properties
Annealing of white cast iron results in production of
Malleable iron
Nodular iron
Spheroidal iron
Grey iron
Cast iron is a
Ductile material
Malleable material
Brittle material
Tough material
Iron ore is, usually, found in the form of
Oxides
Carbonates
Sulphides
All of these
Materials after cold working are subjected to following process to relieve stresses
Hot working
Tempering
Normalising
Annealing
Cast iron has
High tensile strength
Its elastic limit close to the ultimate breaking strength
High ductility
All of the above
Gamma iron exits at following temperature
Room temperature
Near melting point
Between 1400°C and 1539°C
Between 910°C and 1400°C
Malleable cast iron
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by annealing process. It is soft, tough, and easily machined metal
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Which of the following is an amorphous material?
Mica
Silver
Lead
Glass
Foundry crucible is made of
Mild steel
German silver
Lead
Graphite
Nodular iron has
High machinability
Low melting point
High tensile strength
All of the above
Wrought iron
Is a ductile material
Can be easily forged or welded
Cannot stand sudden and excessive shocks
All of these