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.Management Sciences
Category: Engineering Materials
The usual composition of a soldering alloy is__________________?
A. tin, lead and small percentage of antimony
B. tin and lead
C. tin, lead and silver
D. tin and copper
E. tin, copper and lead
Stress relaxation is- the phenomenon ___________________?
A. in which parts are not loaded
B. in which stress remains constant on in-creasing load
C. in which deformation tends to loosen the joint and produces a stress reduced
D. stress reduces on increasing load
E. none of the above
Recrystallisation temperature can belowered by_________________?
A. purification of metal
B. grain refinement
C. working at lower temperature
D. all of the above
E. 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
E. flame hardening
The hardness of steel primarily depends on _____________________?
A. %age of carbon
B. %age of alloying elements
C. heat treatment employed
D. method of manufacture
E. shape of carbides and their distribution in iron
DuraJomin contains___________________?
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 94% aluminium and 6% tin
Machining properties of steel are improved by adding___________________?
A. sulphur, lead, phosphorous
B. silicon, aluminium, titanium
C. vanadium, aluminium
D. chromium, nickel
E. lubricants
Lead is poured into the joint between two pipes. These pipes may be made of____________________?
A. cast iron
B. vitrified clay
C. asbestos cement
D. concrete
E. mild steel
Weld decay is the phenomenon found with _________________?
A. cast iron
B. mild steel
C. non-ferrous materials
D. wrought iron
E. stainless steel
Which of the following pipes is least corrosion resistant__________________?
A. brass
B. mild steel
C. cast iron
D. wrought iron
E. copper
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