Adhesives
Cant be used in the form of pressure sensitive tapes
Cant join two dissimilar metals
Cure instantaneously after application on a surface
None of these
Correct Answer :
D. None of these
Related Questions
Current employed in resistance welding ranges from __________ kVA/
.
1.2 to 2.5
4.5 to 6.2
7.5 to 8.5
10.5 to 15.5
Batch process is preferred over continuous process, when the
Product yields and quality cannot be achieved in continuous process, because of long residence time
Sales demand of product is not steady
Same equipment cannot be used for several processes of the same nature
All (A), (B) & (C)
The trace metal present in insulin is
Cu
Zn
Fe
Ni
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
Bomb
Throttling
Junker's
Boy's
Tempering of a material does not improve its
Machinability
Toughness
Internal stress level
Softness
Broaching tools are usually made of
Cermets
High speed steel
Tungsten carbide
Stellite
Plants produce carbohydrates from the CO2 present in the atmosphere by
Polymerisation
Photochemical reaction
Oxidation
None of these
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
Fracture
Dislocation
Slip
Twinning
Colour comparator is used to measure the
pH value
Electrode potential
Colour intensity
None of these
With increase in annealing temperature, the following defect density decreases.
Vacancy
Dislocation
Grain boundary
All of these
In chemical dehumidification of air
Both specific humidity & dry bulb temperature increases
Both specific humidity & dry bulb temperature decreases
Specific humidity decreases & dry bulb temperature increases
Specific humidity increases & dry bulb temperature decreases
Which of the following is an example of cathodic protection of metals against corrosion?
Painted steel
Galvanised iron
Case hardened steel
Lead lined reactor
Consideration of the creep is the most important in case of the
Blades of gas turbine
Piston of an I. C. engine
Flywheel of steam engine
Cycle chain
What is the percentage of chromium in 18-4-1 high speed steel?
1
4
18
23
Pick out the correct statement about the condensation.
Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
Suitable coating or vapour additive is used to promote film wise condensation
If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it
Reynolds number of condensing liquid is based on its mass flow rate
In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
Stainless steel
Mild steel
High speed steel
High carbon steel
Matte smelting is used in the extraction of
Lead
Zinc
Aluminium
Copper
Cold chisel & hammers are made of
High speed steel
High carbon steel
Forged steel
Mild steel
__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.
Tensile
Fatigue
Impact
None of these
Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is
R ln 2
-R ln 2
3 R ln 2
-3R ln 2
Pick out the wrong statement.
Seam welding, projection welding & spot welding are the classification of electrical resistance welding
Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
In spot welding, two pieces to be joined are overlapped and placed between two electrodes
Mild steel sheet cannot be spot welded
Neutrons are present in all atoms except that of
He
C
H
Ar
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
Alumina
Platinum
Vanadium pentoxide
Iron oxide
In multipass welds, shot peening is done after each pass to
Close the surface porosity
Break the continuity of columnar grains
Flatten the weldment
Introduce texture in the weld
Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
Creep
Fatigue
Endurance
Tensile
__________ of test specimens is not involved in any hardness testing method.
Fracture
Indentation
Wear
Scratch
Particle nature of cathode rays is proved due to the fact that they
Travel in a straight line
Get deflected by magnetic electric field
Produce fluorescence
Heat the exposed material
Bad odour in sanitary latrines is reduced by periodically sprinkling
Bleaching powder
Lime powder
Aluminium sulphate
None of these
Recrystallisation temperature of steel is __________ °C.
50
300
500
800
Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron