An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called____________________?
(A) Constantan
(B) Kanthal
(C) Chromel
(D) German silver
Constantan is an alloy of____________________?
(A) Cu (55%) & Sn (45%)
(B) Cu (55%) & Ni (45%)
(C) Pt (95%) & Rh (10%)
(D) Fe (80%) & Ni (20%)
Which of the following has the highest compressive strength ?
(A) Wrought iron
(B) Cast iron
(C) Mild steel
(D) High carbon steel
Purity of electrical grade aluminium should be ≥ _____________ percent?
(A) 95
(B) 99.5
(C) 85
(D) 90
The metals occuring at the lower most position in the electromotive series____________________?
(A) Do not resist corrosion
(B) Resist corrosion very strongly
(C) Are very brittle
(D) Are heat insulators
Ability of a material to absorb energy in deformation in the plastic range is characterised as its____________________?
(A) Ductility
(B) Toughness
(C) Creep
(D) Resilience
Austenitic manganese steel used for making jaws of crushing machines contains about ______________ percent manganese?
(A) 1.5-2
(B) 3.5-4.5
(C) 7-9
(D) 12-14
High degree of toughness is a must for__________________?
(A) High speed steel
(B) Shock resisting steel
(C) Cold work tool steel
(D) None of these
Which of the following is the easiest to bend ?
(A) Steel
(B) Stainless steel
(C) Cast iron
(D) Wrought iron