241. The metal suitable for bearings subjected to light loads, is
silicon bronze
white metal
monel metal
phosphor bronze
✅ The correct answer is option D.
Engineering Materials MCQs
242. The aluminium alloy, mainly used, for anodized utensil manufacture, is
duralumin
Y-alloy
magnalium
hindalium
✅ The correct answer is option D.
243. Babbit metal is a
lead-base alloy
copper-base alloy
tin-base alloy
cadmium-base alloy
✅ The correct answer is option C.
244. A fine grained steel
is less tough and has a greater tendency to distort during heat treatment
is more ductile and has a less tendency to distort during heat treatment
is less tough and has a less tendency to distort during heat treatment
is more ductile and ha
✅ The correct answer is option B.
245. In process annealing, the hypo-eutectoid steel is
heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
heated below or close
✅ The correct answer is option D.
246. The alloying element which can replace tungsten in high speed steels is
nickel
vanadium
cobalt
molybdenum
✅ The correct answer is option D.
247. When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
white cast iron
nodular cast iron
malleable cast iron
alloy cast iron
✅ The correct answer is option D.
248. Nodular cast iron is produced by adding __________ to the molten cast iron.
nickel
chromium
copper
magnesium
✅ The correct answer is option D.
249. The percentage of carbon in cast iron varies from
0.1 to 0.5
0.5 to 1
1 to 1.7
1.7 to 4.5
✅ The correct answer is option D.
250. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
eutectic cast irons
hypo-eutectic cast irons
hyper-eutectic cast irons
none of these
✅ The correct answer is option B.