Related Questions
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Fibrous fracture is normally encountered in the __________ materials.
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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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In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
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Metal shots used in shot blasting are made of
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Hot extrusion of aluminium is done in the temperature range of __________ °C.
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Preheating before welding is done to
B. Burn oil & grease sticking to plate surfaces
C. Avoid plate distortion
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Maximum consumption of limestone is in the __________ industry.
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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 friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
A. Pipe roughness & pipe diameter
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A material being tested for endurance strength is subjected to the __________ load.
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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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In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
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Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
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Normalising of a casting does not
B. Refine its grain structure
D. Improve its mechanical properties
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A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
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4
Percentage of argon (by volume) in dry atmospheric air is about
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Pick out the correct statement.
A. Hot worked materials are subjected to annealing to remove internal stresses
B. Annealing of steel hardens it slightly
C. Normalising of a material induces stresses
D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
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The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
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A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C.
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__________ rubber is generally used for making 'O' rings used for vacuum sealings.
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Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is
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The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
D. Either (A), (B) or (C); depends on the size of atom
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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 the diving apparatus, helium is used along with oxygen, because it is
B. Not soluble in blood at high pressure
D. Completely miscible with oxygen
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Upto the critical radius of insulation, added insulation, will
A. Increase the heat loss
B. Decrease heat loss and will have no effect beyond that
D. Reduce convection heat loss compared to conduction heat less
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In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
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In __________ process, there is an increase in entropy with no degradation of energy.
B. Isochoric heat addition
D. Isobaric heat addition
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The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
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Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
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Sudden fall of atmospheric pressure by a large amount is an indication of the