Related Questions
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Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by
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Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
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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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In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
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4
The most serious manufacturing defect from fracture toughness point of view is
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__________ iron is produced by the annealing of white cast iron.
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The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability?
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4
Quartz is a __________ material.
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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
Dephosphorization of molten pig iron is favoured by
A. Oxidising and basic slag
B. Reducing and basic slag
C. High activity co-efficient of phosphorous in metal
D. Oxidising and neutral slag
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4
The hardenability of steel decreases with
A. Decrease in dislocation density
B. Increase in solutionising temperature
D. Decrease in grain size
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4
Colour comparator is used to measure the
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4
Cemented carbide tools are not suitable for cutting
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Nickel is a __________ material.
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4
Pick out the correct statement.
A. Materials exhibiting high elasticity obey Hooke's law
B. The elastic behaviour of rubber under compression is the same as its behaviour under tension
C. The damping capacity of a material is due to its plastic deformation
D. The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations
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4
The unit of gc is
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A compact estimate about the amount of materials handling between various work stations is obtained from the
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4
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
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Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
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4
For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be
A. 100% indirect reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction
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4
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
A. Reynolds number (based on sphere diameter) should be < 1
B. Flow around the sphere should be in turbulent region
C. Sphere must be metallic
D. Fluid density should be constant
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The normal stress is the same in all directions at a point in a fluid, only when the fluid
A. Is at rest & has zero viscosity
C. Fluid layer has no motion relative to an adjacent layer of fluid
D. is incompressible & frictionless
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4
Which of the, following is not associated with the functioning of a petrol engine?
A. Compression ignition system
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In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be
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4
Fire refining process is employed in case of
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A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
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What is the range of tempering temperature (°C) for most of the materials?
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The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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Minimum thermal efficiency of a steam boiler may be around __________ percent
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Function of gear box is to