Vessels made of _____________ can be used to store dry chlorine?
(A) Thermoplastic materials
(B) Nickel
(C) Steel or iron
(D) None of these
Electronic structure of a material is generally studied by__________________?
(A) Metallurgical microscope
(B) Electron diffraction
(C) Spectroscopic techniques
(D) X-ray
Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of_________________?
(A) Brass
(B) Copper
(C) High carbon steel
(D) Aluminium
Gunmetal and bronze are not corroded by the action of__________________?
(A) Wet chlorine
(B) Synthetic detergent solution
(C) Hydrochloric acid (10%)
(D) Nitric acid (< 25%)
Hydrochloric acid is _______________ corrosive to common metals?
(A) Least
(B) Not
(C) Mildly
(D) Highly
Invar used in thermocouples is an alloy of nickel and________________?
(A) Iron
(B) Copper
(C) Chromium
(D) Lead
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making________________?
(A) Shafts
(B) Flanges
(C) Gears
(D) Shear blades
Softness of silver can be converted into hardness by alloying it with small quantity of_________________?
(A) Copper & nickel
(B) Zinc
(C) Aluminium
(D) Tin
Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its___________________?
(A) High strength to weight ratio
(B) Low temperature strength properties
(C) Its ability to be cast, rolled, forged & stamped
(D) High strength and corrosion & oxidation-resistance at elevated temperature
Cast iron has____________________?
(A) High ductility
(B) High malleability
(C) Very high tensile strength
(D) Its elastic limit very close to ultimate breaking strength