Presence of nickel & chromium in steel does not raise its
Elastic limit
Machining properties
Ductility
Resilience
Correct Answer :
A. Elastic limit
Related Questions
With increase in annealing temperature, the following defect density decreases.
Vacancy
Dislocation
Grain boundary
All of these
The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
Wet bulb temperature=dry bulb temperature
Wet bulb temperature=dew point temperature
Saturation temperature=dew point temperature
All 'a', 'b' & 'c'
Starting friction is low in case of the __________ lubrication.
Boundary
Hydrodynamic
Hydrostatic
Mixed/semi-fluid
Coating provided on the electrodes used in the arc welding is not expected to
Add alloying elements
Prevent electrode from contamination
Stabilise the arc
Provide protective atmosphere to weld
Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
E = 2G (1 + v)
E = G (1 + v)
E = G (1 + v)/2
E = 2G (1 + 2v)
Suitability of steel for its use in cable is judged by its strength in
Tension
Compression
Torsion
Shear
Electrometallurgical methods of metal extraction is normally used for those metals
Whose oxide/ore is not reduced by carbon
Which fall in the category of alkali & alkaline earth metals
Which stands higher in the electrochemical series of the metal
All (A), (B) & (C)
Which of the following is not used as a bearing material?
Copper-lead alloys
Babbitts
Bronzes
Cermets
Thermit welding is categorised as the __________ welding.
Forge
Fusion
Resistance
Arc
'Flare tower' used in industry is meant for
Venting off (after burning) the excess inflammable/toxic gases at high pressure
Absorbing the pollutant gases from the furnace exhaust
Cooling of furnace exhaust gases
None of these
Pick out the wrong statement.
A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
Tungsten steel and alnico are not hard magnetic materials
Air-petrol ratio in an automotive petrol engine is around
14 : 1
22 : 1
25 : 1
4 : 1
Dew point temperature always gives an indication of the __________ of the moist air.
Dryness
Moisture content
Coolness
Latent heat
Increasing the carbon content of steel
Reduces the upper shelf energy
Increasing the ductility transition temperature
Decreases brittleness
Decreases hardness
__________ test is the appropriate test to determine whether a material is ductile or brittle.
Impact
Cupping
Hardness
Tensile
Pressure exerted by a liquid depends upon its
Surface tension
Density
Viscosity
Buoyancy
Brazing is the joining of metals
Without melting the base metal
With a non-ferrous filler
Both (A) & (B)
Neither (A) nor (B)
What is the value of included angle of a triangular notch for maximum discharge?
30°
60°
90°
120°
Machinability of hard alloys and tool steels is improved by
Spheroidising
Annealing
Tempering
Normalising
The material used for coating the welding electrode is termed as the
Flux
Slag
Protective layer
Binder
On being hit with a hammer, __________ will readily fracture.
Brass
Mild steel
Cast iron
Lead
Which of the following are considered applications of ultrasonic testing?
Determination of elastic constant
Detection of defects in metal
Measurement of material thickness
None of the above
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
10-3
103
10-15
1015
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
300
800
1400
2000
The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
Runner
Cylinder
Mold
None of these
Which of the following materials does not form adherent oxide film on surface?
Copper
Nickel
Aluminium
Gold & silver
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
Very low which prevents their ignition by compression
Very high which prevents their ignition by compression
Zero
None of these
Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of
Paper
Cloth
Lead
Aluminium
Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805
In the Bayer's process, bauxite is digested under pressure using
H2SO4
NaOH
NH3
HCl