Q. Vanadium addition to steel improves its

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Q. Tin is not present as an alloying element in

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Q. Thermit welding uses the following energy source.

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Q. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the

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Q. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.

A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater

Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ?

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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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