Related Questions
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Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
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4
What is the value of included angle of a triangular notch for maximum discharge?
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Metalloids
A. Are good conductor of heat & electricity
B. Act as electron donors with metals & as electron acceptor with non-metals
C. Are not necessarily solids at room temperature
D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
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4
The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
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Pick out the wrong statement.
A. Lead can creep under its own weight at room temperature
B. The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement
C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal
D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase
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Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
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With increase in steam pressure, its specific volume decreases
A. Rapidly first and then slowly
C. Slowly first and then rapidly
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Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
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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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Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
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The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection
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Globular form of cementite is formed during the __________ process.
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Often earing defects are found during deep drawing operation, because the
A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anisotropy due to its texture
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What is the percentage of chromium in 18-4-1 high speed steel?
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Most important property of steels for use in automobile bodies is the
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Increase in temperature, in general results in the
A. Decrease in the viscosities of both liquids & gases
B. Increase in the viscosities of both liquids & gases
C. Increase in the viscosity of liquids and decrease in that of gases
D. Decrease in the viscosity of liquids and increase in that of gases
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For grinding of softer materials, the grinding wheel should have __________ grain size.
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Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
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Thermit welding uses the following energy source.
C. Energy of high velocity electrons
D. Heat generated by friction
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Annealing of cast iron
A. Softens it to facilitate machining
B. Decreases the free carbon
C. Increases the strength
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Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
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In the acid Bessemer process, the hot metal should have the following composition.
A. S < 0.05% and P < 0.05%
B. S < 0.05% and P < 1.5%
C. S < 0.05% and P > 1.5%
D. S > 1.5% and P < 0.05%
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Laser welding is widely employed in the __________ industries.
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Which of the following materials does not form adherent oxide film on surface?
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Heating of ferromagnetic materials to a temperature above Curie temperature makes it
A. Insulator for heat & electricity transmission
C. Behave like paramagnetic materials
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Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid?
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4
Transformer cores are normally made from
C. Grain oriented Fe-Si alloy
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The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.
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Viscoelastic behaviour is observed in __________ materials.
A. Non-crystalline organic polymeric
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Leakage in a cooking gas cylinder is detected by
B. Pouring soap solution on the surface and locating the gas bubbles
D. Pungent smell of mercaptans present in the gas