Amorphous material is one___________________?
(A) in which atoms align themselves in a geometric pattern upon solidification
(B) in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
(C) which is not attacked by phosphorous
(D) which emits fumes on melting
(D) none of the above
Which is false statement about case hardening. Case hardening is done by_______________?
(A) electroplating
(B) cyaniding
(C) induction hardening
(D) nitriding
(D) flame hardening
Chromium in steel_________________?
(A) improves wear resistance, cutting ability and toughness
(B) refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
(C) improves cutting ability and reduces hardenability
(D) gives ductility, toughness, tensile strength and anticorrosion properties
(D) makes steel hard
Cemented carbide tools are not found to be suitable for cutting_______________?
(A) brass
(B) cast iron
(C) aluminium
(D) steel
(D) non-ferrous alloys.
Railway rails are normally made of_______________?
(A) mild steel
(B) alloy steel
(C) high carbon
(D) tungsten steel
(D) cast iron steel
Pick up the wrong statement Nickel and chromium in steel help in _________________?
(A) providing corrosion resistance
(B) improving machining properties
(C) providing high strength at elevated temperatures
(D) raising the elastic limit
(D) improving the resilience and ductility
Eutectoid steel contains following percentage of carbon_______________?
(A) 0.02%
(B) 0.3%
(C) 0.63%
(D) 0.8%
(D) 1.2%.
Basic constituents of Monel metal are _________________?
(A) nickel, copper
(B) nickel, molybdenum
(C) zinc, tin, lead
(D) nickel, lead and tin
(D) none of the above
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________?
(A) silver metal
(B) duralumin
(C) Hastelloy
(D) monel metal
(D) invar