Q. The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained

View solution

Q. During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.

View solution

Q. The casting ability of aluminium increases when __________ is added to aluminium.

View solution

Q. Manganese bronze has

View solution

Q. A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as

View solution

Q. Silicon bronze contains

View solution

Q. In acidic bessemer process, the furnace is lined with

View solution

Q. Micro-structure of a material is, generally, examined by

View solution

Q. The addition of magnesium to cast iron increases its

View solution

Q. Killed steels

View solution

Q. The slow cooling of steel from the __________ results in a coarse grained structure.

View solution

Q. Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?

View solution

Q. The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.

View solution

Q. Muntz metal (Yellow brass) contains

View solution

Q. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

View solution

Q. The slag from the blast furnace

View solution

Q. Which of the following is a mesomorphous material?

View solution

Q. In the middle part of the blast furnace (zone of absorption), the temperature is

View solution

Q. The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.

View solution

Q. The temperature point at which the change starts on heating the steel is called

View solution