The charge is fed into the blast furnace through the
Stack
Throat
Bosh
Tyres
Correct Answer :
B. Throat
Related Questions
The coordination number of a face centred cubic space lattice is
Six
Twelve
Eighteen
Twenty
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
Chromium
Nickel
Vanadium
Cobalt
Pig iron is the name given to
Raw material for blast furnace
Product of blast furnace made by reduction of iron ore
Iron containing huge quantities of carbon
Iron in molten form in the ladles
Blast furnace is used to produce
Pig iron
Cast iron
Wrought iron
Steel
The percentage of carbon in low carbon steel is
0.05 %
0.15 %
0.3 %
0.5 %
Compressive strength of grey cast iron in tonnes/cm is of the order of
35
57
710
1015
Sulphur in cast iron
Makes the iron soft and easily machinable
Increases hardness and brittleness
Make the iron white and hard
Aids fusibility and fluidity
Which of the following elements does not impart hardness to steel?
Copper
Chromium
Nickel
Silicon
Materials after cold working are subjected to following process to relieve stresses
Hot working
Tempering
Normalising
Annealing
Nodular cast iron is produced by adding ________ to the molten cast iron.
Nickel
Chromium
Copper
Magnesium
The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
Duralumin
Y-alloy
Magnalium
Hindalium
Nickel when added to copper improves
Machinability
Hardness
Hardness and strength
Strength and ductility
Induction hardening is basically a
Carburising process
Surface hardening process
Core hardening process
None of these
Steel contains
80% or more iron
50% or more iron
Alloying elements like chromium, tungsten nickel and copper
Elements like phosphorus, sulphur and silicon in varying quantities
The property of a material due to which it breaks with little permanent distortion, is called
Brittleness
Ductility
Malleability
Plasticity
Pick up the wrong statement Nickel and chromium in steel help in
Providing corrosion resistance
Improving machining properties
Providing high strength at elevated temperatures
Raising the elastic limit
Crystal structure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques
The temperature required for full annealing in hypereutectoid steel is
30°C to 50°C above upper critical temperature
30°C to 50°C below upper critical temperature
30°C to 50°C above lower critical temperature
30°C to 50°C below lower critical temperature
Iron is
Paramagnetic
Ferromagnetic
Ferroelectric
Dielectric
The following element can't impart high strength at elevated temperature
Manganese
Magnesium
Nickel
Silicon
The coke in the charge of blast furnace
Controls the grade of pig iron
Acts as an iron bearing mineral
Supplies heat to reduce ore and melt the iron
Forms a slag by combining with impurities
Induction hardening is the process of
Hardening surface of work-piece to obtain hard and wear resistant surface
Heating and cooling rapidly
Increasing hardness throughout
Inducing hardness by continuous process
In low carbon steels, presence of small quantities of sulphur improves
Weldability
Formability
Machinability
Hardenability
Structural steel contains following principal alloying elements
Nickel, chromium and manganese
Tungsten, molybdenum and phosphorous
Lead, tin, aluminium
Zinc, sulphur, and chromium
1841 high speed steel contains
Vanadium 4%, chromium 18% and tungsten 1%
Vanadium 1%, chromium 4% and tungsten 18%
Vanadium 18%, chromium 1% and tungsten 4%
None of the above
The percentage carbon content in wrought iron is about
0.02
0.1
02
0.4
In high speed steels, manganese is used to tougher the metal and to increase its
Yield point
Critical temperature
Melting point
Hardness
In which of the following cases, consideration of creep is important
Flywheel of steam engine
Cast iron pipes
Cycle chains
Gas turbine blades
Eutectoid reaction occurs at
600°C
723°C
1147°C
1493°C
Macrostructure of a material is, generally, examined by
Naked eye
Optical microscope
Metallurgical microscope
X-ray techniques