Related Questions
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Which of the following does not have a sharp melting point?
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Minimum thermal efficiency of a steam boiler may be around __________ percent
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Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
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For grinding of softer materials, the grinding wheel should have __________ grain size.
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A material subjected __________ must have high resilience.
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Fahrenheit and Centigrade scales have the same readings at
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Consumable electrodes are used in the __________ welding.
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Exposure to __________ accelerates the degradation of plastics.
B. High atmospheric temperature
C. High ambient temperature
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The most important consideration in value engineering is the
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Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
A. Pressure falls below the vapour pressure
B. Pressure becomes very high
C. Temperature becomes low
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Hot working of lead is carried out at
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Silicon in steel
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
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Which of the following materials has the poorest electrical conductivity?
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Auto collimator is used to check
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'Dikes' are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel)
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Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
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Which of the following metals is not subjected to electrolytic refining/purification?
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The product of a commercial direct reduction process is
D. Iron saturated with carbon
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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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The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1)
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Good design of the casing of a centrifugal pump aims at minimising the
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In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
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Powder metallurgy is used to produce
A. High precision components with complex cavities and sharp features
B. Components of large size
C. Porosity free components
D. Components of such alloys whose constituents do not form alloys readily
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The specific gravity of coal depends mainly on its __________ content.
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Aluminium is extracted from
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A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
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The noble metals
A. Are exemplified by Na, K and Li
B. Do not resist corrosion very strongly
C. Are the lowermost in the electro-chemical series of metals
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Ceramic compounds as compared to metallic compounds
B. Resist greater tensile stress at room temperature
C. Have higher melting temperature
D. Are better conductor of electricity at higher temperature
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Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
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Which of the following phenomenon/ phenomena is/are diffusion controlled?