Q. Yield strength of a polycrystalline metal with an average grain size, d, is proportional to

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Q. Pick out the wrong statement:

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Q. The tensile strength of plastics ranges from __________ kg/mm².

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Q. Grain hardness is measured by the __________ hardness testing method.

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Q. The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent.

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Q. During brazing, if the fluxes are entrapped, it results in the

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Q. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm.

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Q. All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

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Q. The standard instrument used for calibrating the load applied by universal testing machine is called

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Q. The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is

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Q. With increase in pressure, the saturation temperature of steam

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Q. 'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.

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Q. Pick out the wrong statement. Termination of polymerisation reaction occurs, if the

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Q. A thin, flat & square plate measuring 2 m x 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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Q. The maximum value, which the residual stress in a material can reach is the __________ of the material.

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Q. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

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Q. Which set of materials is used as a moderator in nuclear reactor ?

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Q. Malleabilisation heat treatment is performed on

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Q. For hardening high alloy steel, it is to be heated slowly and uniformly to avoid

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Q. Disposable patterns are made of

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