Q. Case hardening of a material is

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Q. Titanium is added to molten aluminium alloys before casting for the purpose of

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Q. Cemented carbide tools are not suitable for cutting

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Q. The difference between gross & net calorific values of fuel is due to the

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Q. Which of the following is preferred for rivetting ?

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Q. Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

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Q. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.

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Q. Steel balls are manufactured by

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Q. __________ temperature remains constant during adiabatic saturation process of unsaturated air.

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Q. The best lubricants for a machine working at high temperature & load is

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Q. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m⁻¹ . k⁻¹ and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

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Q. Which of the following is not a principal alloying element for the structural steel?

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Q. Metalloids

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Q. Pick out the wrong statement

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Q. Lead is poured into the joints between two __________ pipes.

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Q. 'Ice point' is designated on Farenhite temperature scale by

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Q. The phenomenon occurring during explosion of a hydrogen bomb is

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Q. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

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Q. Nitriding of a steel part does not increase its

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Q. __________ of grey cast iron produces white cast iron.

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