Related Questions
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Notched bar test is used for testing the __________ of a material.
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Which of the following metals cannot be hot worked at room temperature?
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__________ wire is never used for making the heating element.
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Which of the following metals is the most prone to work hardening?
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Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
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4
Which of the following is resistant to the action of both heat & chemicals?
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In a good rimming steel
A. Carbon and silicon should be low
B. Silicon should be low but carbon should be high
C. Both silicon & carbon should be high
D. Silicon should be high but carbon should be low
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4
Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
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A jet engine turbine blade is normally manufactured by
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Dies for wire drawing are generally made of
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Load cells used for the measurement of weight has
A. Compact & rugged construction with an accuracy of 0.1 to 1%
B. No moving parts and incurs negligible deflection under load
C. Provision of thermal compensation and is hermetically sealed
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__________ is used for tying the steel columns to concrete foundation.
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Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.
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Which of the following rays has the least wavelength?
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The Al2O3 content of cryolite in Hall- Heroult cell is maintained between __________ percent.
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__________ property of a material is determined by the Herbert Pendulum device.
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The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.
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Which of the following materials has the maximum shrinkage allowance?
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The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
D. More but less than the diameter of bolt
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Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
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The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
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4
Work study deals with the __________ study.
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A solar cell converts the sunlight directly into __________ energy.
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Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
D. Tungsten steel and alnico are not hard magnetic materials
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Brazing is the joining of metals
A. Without melting the base metal
B. With a non-ferrous filler
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In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
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4
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
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The order of a chemical reaction
A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
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A material being tested for endurance strength is subjected to the __________ load.
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The two elements required to form substitutional solid solution should not have
A. Same crystalline structure
C. Widely differing electronegativity