Related Questions
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4
Temperature attained in soldering of metals is about __________ °C.
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4
Stainless steel is welded with difficulty because of
A. Its high melting temperature
D. Chromium carbide formation
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4
The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by
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4
Increase in the entropy of a system represents the
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature
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4
A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
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Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is
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4
Chromium molybdenum steel cannot be welded using __________ welding.
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Screws are specified by their __________ diameters.
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4
Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
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4
Rain drops falling through atmospheric air attain limited terminal velocity, because of
A. Upward thrust due to air
B. Viscous force exerted by air
C. Surface tension effects of water
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4
Auto collimator is used to check
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4
The most abundant metal present in the earth's crust is;
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A fluid is termed as the Newtonian fluid, when the shear stress is __________ the velocity gradient.
B. Inversely proportional to
C. Directly proportional to
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4
Addition of silicon to cast iron
A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal
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4
The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their
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M10 index of coke indicates its
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4
Suitability of steel for its use in cable is judged by its strength in
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4
Broaching tools are usually made of
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4
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
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4
Dowtherm is a
A. High temperature heating medium (a petroleum product)
B. Product of coal tar distillation
C. Very heat sensitive material
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4
Silicon crystal can be converted to p-type semiconductor by doping with
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4
Tempering of a material does not improve its
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Highest cutting speed is achieved by the __________ tool material.
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Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
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4
Silicon percentage in acid resistant cast iron is about
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Which of the following has the least value of ultimate tensile strength (UTS)?
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Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
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4
Steel balls are manufactured by
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4
Change in volume of metals from absolute zero temperature to their melting points is
A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals
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4
Which of the following pairs is not correctly matched?
A. Uranium - 233 : Fertile material
B. Binding energy : Mass defect
C. Scattering: Absorption cross-section
D. Number of nucleons : Mass number