Annealing of white cast iron produces __________ iron.
Grey
Nodular
Malleable
Spheroidal
Correct Answer :
C. Malleable
Related Questions
Which of the following rays has the least wavelength?
Ultraviolet rays
Infrared rays
Cosmic rays
X-rays
Super conduction in metals is observed at a temperature of __________ °K.
<100
>100
About 273
About 373
One of the methods of purification of leach liquor is ion exchange, which involves
Exchange between two liquid phases
Exchange between a gaseous phase and a liquid phase
Exchange between a liquid phase and an organic resin phase
Exchange between a solid phase and a gas phase
__________ is the most important element, which controls the physical properties of steel.
Manganese
Silicon
Carbon
Vanadium
Notched bar test is used for testing the __________ of a material.
Impact strength
Endurance limit
Machinability
Corrosion resistance
When an isolated thermodynamic system executes a process,
Work is done
Heat transfer takes place
Mass flow occurs across the boundary of the system
No chemical reaction takes place within the system
Pick out the wrong statement.
The equivalent stiffness of two springs (of equal stiffness 'S') in series is S/2 while in parallel is 2S
For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire diameter)
Crushing load or columns is less than the buckling load
Modulus of resilience is proportional to (stress at elastic limit)2
Neutrons are present in all atoms except that of
He
C
H
Ar
Drills are usually made of
Cermets
High speed steel
Alloy steel
Tungsten carbide
Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.
Diminishing balance
Sinking fund
Multiple straight line
Sum of the years digit
Carbon supply in pack carburising process is in the form of
Charcoal
Calcium carbide
Hydrocarbon oil
Graphite
Internal energy of a gas obeying Van-Der- Waals equation of state, [p + (a/v2)] (V - b) = RT, depends upon its
Pressure & temperature
Pressure & specific volume
Temperature & specific volume
Temperature only
Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxyacetylene welding is __________ Nm3.
0.5
1
1/3
2.5
Earing is a defect found in steels after the following metal working operation.
Extrusion
Rolling
Deep drawing
Wire drawing
Coarse grained steels have
Low toughness
No tendency to distort
High density
Very high toughness
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
Conduction
Convection
Radiation
Both 'a' & 'b'
Normalising does not __________ of a metal.
Improve machinability & tensile strength
Remove internal stresses
Refine the structure
Remove strains caused by cold working
Fibre glass is a composite material of
Glass fibre in a polymer matrix
Glass fibre in a metallic matrix
Polymer fibre in a glassy matrix
Both 'b' & 'c'
The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
Refrigerant cooling
Evaporator
Condenser
Throttling
__________ of grey cast iron produces white cast iron.
Tempering
Rapid heating
Rapid cooling
Slow cooling
Lead is poured into the joints between two __________ pipes.
Cast iron
Steel
Concrete
Plastic
At absolute zero temperature, for any reaction involving condensed phases
Δ G° = 0 , Δ H° = 0
Δ H° = 0 , Δ S° = 0
Δ S° = 0 , Δ E° = 0
Δ S° = 0 , Δ Cp° = 0
Out of the following, the most malleable material is
Copper
Aluminium
Wrought iron
Lead
__________ stress cannot be sustained by a fluid in equilibrium.
Shear
Tensile
Compressive
None of these
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
T
1/T
T2
1/T2
The ratio of the shear stress to the principal stress on a principal plane is
0
1
1/2
1/3
The surface tension of a liquid, at critical temperature is
Indeterminate
Zero
Infinity
Same as that at any other temperature
Basicity 
of the slag in Indian blast furnace is in the range of
0.7-1.0
1.1-1.4
1.5 - 1.8
2.0 - 2.5
Alloy powder manufactured by the following process have spherical shapes.
Electrochemical deposition
Gaseous reduction
Atomisation
Mechanical attrition
Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
80-120
200-300
600-800
1000-1100