Coke oven regenerators are made of ______________ bricks?
(A) Fire clay
(B) Silica
(C) Low thermal conductivity
(D) High electrical conductivity
Addition of _____________ in steel can help in increasing the depth of hardness?
(A) Nickel
(B) Chromium
(C) Vanadium
(D) Tungsten
Fermenter used in the production of penicillin by deep fermentation process is a ______________ lined steel vessel ?
(A) Rubber
(B) Monel
(C) Glass
(D) Nickel
Which of the following is an alloy of nickel and copper ?
(A) Hastelloy
(B) Duriron
(C) Monel
(D) Inconel
Which of the following is not a nickel based alloy ?
(A) Inconel
(B) Hastelloys
(C) Nimonics
(D) Babbitt metal
Presence of silicon in steel_____________________?
(A) Is in the form of free Si
(B) Indicates that steel is not deoxidised properly
(C) Decreases the blow holes formation tendency in castings
(D) None of these
H2SO4 (< 50% concentration) is corrosive to_________________?
(A) Aluminium, mild steel, stainless steel, concrete & tin
(B) Copper, cast iron & high silicon iron (14% Si)
(C) Rubber (butyl and hard), silicone rubber & Teflon
(D) Glass, graphite, porcelain & stoneware
The purpose of nitriding the steel is to___________________?
(A) Harden its surface
(B) Soften its surface
(C) Improve its reliability
(D) None of these
Maximum consumption of zinc is in____________________?
(A) Alloying
(B) Galvanising
(C) Utensil manufacture
(D) Electrical industry