Which one of the following heat treatment processes produces a scale free surface on the component? Mark as favorite Copy Link flame hardening case hardening induction hardening nitriding Check Answer
The process of heating steel to about 40°c above the upper critical temperature and cooling it in still air to room temperature is known as? Mark as favorite Copy Link normalising tempering hardening annealing Check Answer
Which of the following quenching diameter is used for hardening high speed steel tool? Mark as favorite Copy Link water brine solution oil soda water Check Answer
Which one of the following processes is adapted to improve the internal structure of steel. Which has been subject to severe hammering? Mark as favorite Copy Link hardening tempering annealing normalising Check Answer
After hearing up to required hardening temperature, why must tool steels be quenched? Mark as favorite Copy Link to induce internal stresses to build up hardening structure to fall off the scale to return it to its original structure Check Answer
The process of inducing carbon to low carbon Steels to get a hard surface is called? Mark as favorite Copy Link annealing case hardening carburizing normalising Check Answer
liquid carbonising is done in a heated salt bath. Which one of the following is not a carbonising salt? Mark as favorite Copy Link sodium carbonate sodium sulfate sodium cyanide barium chloride Check Answer
Why line stone is added to the ore in the blast furnace? Mark as favorite Copy Link To burnt the carbon in coke To form molten slag To increase the melting point of ore To supply the oxygen Check Answer
Which one of the following Which one of the following is not a case hardening process? Mark as favorite Copy Link carburizing tempering cyaniding nitriding Check Answer
Which one of the following process is used for hardening the surface of tool steel? Mark as favorite Copy Link carbonising cyaniding induction hardening hardening Check Answer