Bissoy.com
Doctors Medicines MCQs Q&A

Related Questions

Arrange the following in terms of increasing severity of quench.
P. Oil quenching
Q. Water quenching
R. Water quenching with agitation
S. Brine quenching
Consider the following statements: 1. The quenching of steel results in an increase in wear resistance, strength and hardness. 2. By the process of case hardening, hard wearing resistant surface is produced on mild steel. This is an effective method for low carbon steels because they cannot be hardened by the process of quenching. 3. When a metal is mixed with small atoms of non-metallic element in such a manner that invading atoms occupy interstitial positions in the metal lattice, an interstitial alloy results. What of the above statements are correct?
Statement (I): Salts like sodium chloride, sodium hydroxide when added to water to use as quenching media, cooling rate of quenching media will be increased. Statement (II): When salts are added to water, during quenching, distortion and crack appearance in the quenched steel components reduces.
Statement (I): Piston temperature profiles near full load are flattened in case of liquid cooled engines whereas for air cooled engines temperature profiles are steeper. Statement (II): The piston temperature profiles are different in nature for liquid cooled and air cooled engines because of the different values of heat capacities.
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
The cooling rate must be _________ the critical cooling rate for hardening of steel by quenching.
Assertion: a : During hardening of steel, the component to be heat treated is strongly agitated in the quenching medium.
Reason : r : The agitation breaks down the vapour barrier allowing the quench to proceed at a more rapid rate.
Which quenching medium is used for quenching of carbon and low alloy steels?
Which of the following quenching medium is used for quenching of P/M parts?
Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?