Related Questions
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The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the
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Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
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An alloy of Fe - 0.4 % C is
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What is the value of included angle of a triangular notch for maximum discharge?
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Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting)
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4
Oxygen cylinders used for autogenous (cutting/welding) purposes are
A. Seamless & made of steel
B. Heat treated before use
D. Welded steel cylinders
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Normalising does not __________ of a metal.
A. Improve machinability & tensile strength
B. Remove internal stresses
D. Remove strains caused by cold working
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Most of the phosphorous present in the blast furnace burden enters into
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What happens, when SO2 is passed through a solution of H2S in water?
A. Precipitation of sulphur takes place
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Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
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Routing in production, planning & control is concerned with the
A. Sequence of operation to be performed
B. Progress of work performed
C. Authorisation of work to be performed
D. Balancing of load on machines
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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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More than 95% of __________ is present in corundum.
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The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
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Silicon percentage in silicon steel used for electrical equipments is about
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Insulation of liquid surface can be achieved by __________ on top of its surface.
A. Floating hollow polypropylene spheres
B. Spraying alumina powder
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Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?
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At absolute zero temperature, for any reaction involving condensed phases
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Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
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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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High speed steel tools retain their hardness upto a temperature of __________ °C.
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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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__________ stress cannot be sustained by a fluid in equilibrium.
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Which of the following low melting alloy containing bismuth and lead is used for electric fuse?
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Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
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Oxyacetylene reducing flame is used while carrying out welding on
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In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
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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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Tesla metre per ampere (T. m/A) is the unit for the measurement of
A. Magnetic susceptibility
C. Permeability of free space
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Yield strength of a polycrystalline metal with an average grain size d, is proportional to