Aluminium as a material of construction suffers from the disadvantage of__________________?
(A) Very high cost
(B) Rather low tensile strength
(C) Very low strength to weight ratio
(D) Scarce availability
Which metal is protected by the layer of its own oxide ?
(A) Iron
(B) Silver
(C) Calcium
(D) Aluminium
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of_____________________?
(A) Stainless steel
(B) Cast iron
(C) Lead lined steel
(D) Rubber lined steel
White cast iron is not__________________?
(A) Malleable
(B) Whitish in color
(C) Brittle
(D) Strong and hard
Lead is_____________________?
(A) Not resistant to corrosion
(B) Used as a cathodic material
(C) Not used as pigment (in its compound forms) for paints
(D) Used as a shock absorber (in mattress form) between the foundation and steel framework of skyscraper buildings
Which one is remelted and poured into moulds to get cast iron ?
(A) Wrought iron
(B) Pig iron
(C) Low carbon steel
(D) Mild steel
The addition of antimony in tin-based alloys improves its________________?
(A) Rupture strength and hot hardness
(B) Impact strength and bonding strength
(C) Deformation resistance
(D) Wear resistance
All materials obey Hooke’s law within elastic limit. When elastic limit is reached, the tensile strain__________________?
(A) Increases very quickly
(B) Decreases very quickly
(C) Increases in proportion to stress
(D) Decreases in proportion to stress
Which of the following has the least carbon percentage ?
(A) Low carbon steel
(B) Mild steel
(C) Wrought iron
(D) White cast iron
Locomotive boiler tubes are made of _____________ alloys?
(A) Arsenic copper
(B) Magnesium
(C) Aluminium
(D) Nickel