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For a good quality brazing, the molten filler alloy should have
low contact angle with the base metal
high surface tension
In the Ellingham diagram for oxides, C-CO line cuts the M-MO line at temperature T1 and the M′-M′O line at a higher temperature T2. At a temperature greater than T1 and less than T2, carbon can reduce
both MO and M′O
neither MO nor M′O
The professor ordered to the students to go out of theclass.
I II III IV Which of the above underlined parts of the sentence is grammatically incorrect
An edge dislocation is present in α-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70GPa.
Energy (in J/m) of the dislocation is
1.1 * 10-9
0.5 * 10-9
4.4 * 10-9
2.2 * 10-9
Determine the correctness or otherwise of the following Assertion
(a) and Reason (r). Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure isused.
Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values
both a and r are true, and r is the reason for a
A is false but R is true
both a and r are true, but r is not the reason for a
A is true but R is false
How many boundary conditions are required to solve the following equation
Three in r-direction and one for time
Two in r-direction
One in r-direction and one for time
Two in r-direction and one for time
A steel ball
(density ρsteel = 7200 kg/m3) is placed in an upward moving liquid Al
(density ρAl = 2360 kg/m3, viscosity μAl = 1 * 10–3 Pa.s and Reynolds number = 5 * 105). The force (F) exerted on the steel ball is expressed as F = f π R2(ρAl v2/2)where, f is friction factor (=0.2), v is the velocity of liquid Al and R is the radius of steelball.
The force exerted on the steel ball is
A fluid is flowing with a velocity of 0.5 m/s on a plate moving with a velocity of 0.01 m/s in the samedirection.
The velocity at the interface of the fluid and plate is
Match the processes in Group I with the objectives in Group IIGroup I GroupIIP.
Vacuum Arc Degassing (VAD) 1. Primary ironmakingQ.
LD 2. Secondary steelmakingR.
COREX 3. DirectsmeltingS.
Blast Furnace 4. Primary steel making
P-3, Q-4, R-2, S-1
P-4, Q-3, R-1, S-2
P-2, Q-4, R-3, S-1
P-3, Q-2, R-1, S-4
Ladle deoxidation of liquid steel is done at 1600°C by adding ferro-aluminium.
By assuming Stokes law behaviour, time (in s) required for alumina particles of 50 μm diameter to float to the surface from a depth of 2 m would be__________ [Given: density of steel = 7000 kg/m3, density of alumina = 3650 kg/m3, viscosity of steel = 6 * 10-3 kg/m/s]
1212 to 1218
6767 to 6783
8989 to 8995
2626 to 2632
A unit cell of an element has maximum linear density along the direction.
The packing density of its
(100) plane is
Identify the correct combination of the following statements P. Hydrogen electrode is a standard used to measure redox potentials Q. Activation polarization refers to electrochemical processes controlled by reaction sequence at metal-solution interface R. Potential-pH diagrams can be used to predict corrosion rates of metals S. Cathodic protection can use sacrificial anodes such as magnesium
P, R and S
P, Q and R
Q, R and S
P, Q and S
The aperture size (in μm) of a 200 mesh sieve having a wire diameter of 53 μm is __________
23 to 25
73 to 75
45 to 47
88 to 90
A material with grain size of ASTM No. 6 has a lattice frictional stress 100 MN/m2 and locking parameter (Hall-Petch constant) 0.10 MN/m3/2 Yield strength of the material is approximately
and B arefriends.
They decide to meet between 1 PM and 2 PM on a givenday.
There is a condition that whoever arrives first will not wait for the other for more than 15minutes.
The probability that they will meet on that day is
Which one of the following methods is NOT used for numerical integration
Floatation beneficiation is based on the principle of
Mineral surface hydrophobicity
Particle size difference
In a production facility, iron rods are made with a mean diameter of 6 cm and standard deviation of 02 cm. If a large number of rods are tested, the approximate percentage of rods whose sizes fall in the range of 5.98 cm to 6.02 cm is
Hot metal at 1700 K is poured in a sand mould that is open at thetop.
Heat loss from the liquid metal takes place by
Radiation and conduction only
Radiation, conduction and convection
Radiation and convection only
The permeability of burden in an ironmaking blast furnace can be improved by using
oxygen enriched air blast
pulverized coal injection through the tuyeres
The yield strength of a polycrystalline metal increases from 100 MPa to 145 MPa on decreasing the grain size from 64 μm to 25 μm. The yield strength of this metal (in MPa) having a grain size of 36 μm is
Which one of the following elements is an austenite stabilizer
The flow stress of an alloy varies with strain rate MPa.
When the alloy is hot extruded from 10 cm diameter to 5 cm diameter at a speed of 2 cm/s, the flow stress is
The sulphide capacity
(CS) of liquid slag of composition 55 wt.% CaO, 20 wt.% SiO2, 5 wt.% Al2O3, and 10 wt.% MgO is given by the following equationlog CS = 3.44 (XCaO + 0.1 XMgO - 0.8 XAl2O3 - XSiO2) -
(9894/T) + 2.05 where, X is mole fraction of the respectivecomponents.
Atomic weights of Ca, Mg, Si, Al and O are 40, 24, 28, 27 and 16respectively.
The value of CS at 1900 K is
At equilibrium spacing in a crystalline solid, which of the following is true for net inter-atomic force (F) and potential energy (U)
F is zero and U is minimum
F is minimum and U is zero
F is zero and U is zero
F is minimum and U is minimum
With respect to the matrix of Al-Cu alloys, G-P zones are
The data given in the following table summarizes the monthly budget of an averagehousehold.
The approximate percentage of the monthly budget NOT spent on savings is
Saturation magnetization of an FCC metal with lattice parameter 0.2 nm is 600 kA/m. The net magnetic moment per atom is given by (in Bohr magneton)
2.02 * 1057
8.08 * 1057
Arrange the following in terms of increasing severity of quench P. Oil quenching Q. Water quenching R. Water quenching with agitation S. Brine quenching
P < Q < R < S
Q < P < R < S
Q < R < P < S
P < Q < S < R
In a brittle material, the maximum internal crack length is 8 μm. If Young’s modulus is 400 GPa and surface energy is 3.14 J/m2, the estimated theoretical fracture strength (in MPa) is