Question 1

dispersion hardening materials can be produced with the help of &#8230;&#8230;process&#10;A)forging&#10;B)rolling&#10;C)powder metallurgy&#10;D)none of the above

Accepted Answer

Dispersion hardening materials are typically produced using the powder metallurgy process, which involves mixing fine powders of the base metal and the dispersoid, compacting them, and then sintering the compact to produce a solid material. This process allows for uniform distribution of the hardening particles throughout the metal matrix, enhancing its strength and other mechanical properties.

Question 2

out of the following methods ,one is method used flame hardening process?&#10;A)stationary method&#10;B)circular and progressive method&#10;C)spiral and progressive method&#10;D)all of the above

Accepted Answer

All of the methods listed (stationary, circular and progressive, spiral and progressive) are used in the flame hardening process, each suitable for different types of workpieces and desired hardness patterns.

Question 3

for induction hardening process,the heat source is a &#8230;..&#10;A)induction coil carrying current&#10;B)heating coil carrying current&#10;C)metallic probes carrying current&#10;D)none of the above

Accepted Answer

Induction hardening utilizes an induction coil carrying current to generate an alternating magnetic field, which in turn induces eddy currents in the workpiece, heating it rapidly for hardening.

Question 4

one of the following is main disadvantage of flame hardeing process of nsurface hardeing?&#10;A)possibility of over heating and grain growth&#10;B)close control over case depth is not possible&#10;C)mostly suitable or symmetri components only&#10;D)all of the above

Accepted Answer

Flame hardening can lead to overheating and grain growth, controlling the case depth precisely can be challenging, and it is generally more suitable for symmetric components, making all of the options correct disadvantages of the process.

Question 5

Due to one of the reason given below,give rise to quench cracking?&#10;A)improper quenching medium&#10;B)improper selection of steel&#10;C)improper design of component&#10;D)all of the above

Accepted Answer

Quench cracking can occur due to various factors including the use of an improper quenching medium, the selection of steel that is not suitable for the quenching process, and the design of the component that does not take into account the stresses and structural changes that occur during quenching. All these factors can contribute to the development of cracks during the quenching process.

Question 6

the pearlitic microstructure which is obtain after patenting process is suitable to which manufacturing process&#10;A)casting of cylindrical block&#10;B)forging of cam shaft&#10;C)drawing of wires&#10;D)all of the above

Accepted Answer

The pearlitic microstructure obtained after the patenting process is particularly suitable for the drawing of wires. This process involves heating the steel to a temperature above the transformation range and then cooling it in air or molten salt to obtain a fine pearlitic structure, which enhances the ductility and strength of the steel, making it ideal for being drawn into wires.

Deck 4: Hardening Processes and Materials