Plasticisers are added to polymers to improve their____________________?
(A) Tensile strength
(B) Softness & flexibility
(C) Acid resistance
(D) Alkali resistance
Titanium metal_________________?
(A) Exists in three allotropic forms
(B) Cannot be welded
(C) Is used in oceanographic and space exploration applications
(D) None of these
Graphite is corroded by_________________?
(A) Sulphuric acid (10%)
(B) Sea water
(C) Hydrochloric acid
(D) None of these
Creep is not exhibited at low temperature by _____________________?
(A) Rubber
(B) Acrylics
(C) Lead
(D) Plastics
Which of the following exercises most powerful influence on the mechanical properties of steel ?
(A) Manganese
(B) Carbon
(C) Phosphorous
(D) Silicon
Babbitt metal (used for making bearings) comprises of__________________?
(A) Mainly tin (85%) and lead
(B) Saw dust and iron dust mixture
(C) Zinc and aluminium
(D) Copper and aluminium
Acid proof stoneware_________________?
(A) Has very low strength
(B) Cannot be heated
(C) Is broken by small temperature changes
(D) All
Light weight metallic alloy used in aircraft industry is________________?
(A) Aluminium
(B) High silicon (14%) iron
(C) Duralumin
(D) Phosphor bronze
Chromel (Nichrome) is an alloy of_____________________?
(A) Chromium and molybdenum
(B) Nickel and chromium
(C) Molybdenum and nickel
(D) Chromium and aluminium
Babbitt metal used for making bearings should have_____________________?
(A) High co-efficient of friction between journal and bearing
(B) Ability to retain lubricant on its surface
(C) Low co-efficient of friction between journal and bearing
(D) Both