Materials and Construction Questions

• Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
• Babbit metal used for bearings is a____base alloy.
• Nickel (56%) and molybdenum (17%) alloys are called
• 18-4-1 high speed steel contains 18%, 4% and 1% respectively of
• German silver in an alloy of
• Which of the following stainless steels is non-magnetic?
• Invar used in thermocouples is an alloy of nickel and
• White cast iron is not
• Heavy duty bearings are usually made of
• Ceramic recuperators are generally made of
• The metals occuring at the lower most position in the electromotive series
• Constantan is an alloy of
• The main purpose of galvanising iron sheets is to
• Sulphur melting pit in the sulphuric acid plant is made of
• Presence of nickel in steel improves its
• Shock resisting steels should possess high
• Acetylene gas holder is made of
• Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
• Aluminium as a material of construction suffers from the disadvantage of
• The addition of antimony in tin-based alloys improves its