81. Beryllium bronze contains
60% copper and 40% beryllium
80% copper and 20% beryllium
97.75% copper and 2.25% beryllium
99% copper and 1% bery
✅ The correct answer is option C.
Engineering Materials MCQs
82. Duplex process of steel making is a combination of
basic bessemer and acid open hearth processes
acid bessemer and basic open hearth processes
acid bessemer and acid open hearth processes
basic bessemer and bas
✅ The correct answer is option B.
83. Wrought iron
is a ductile material
can be easily forged or welded
cannot stand sudden and excessive shocks
all of these
✅ The correct answer is option D.
85. Duralumin has better strength than Y-alloy at high temperature.
TRUE
FALSE
✅ The correct answer is option B.
86. The steel scrap added in the charge of cupola controls the grade of cast iron produced.
Correct
Incorrect
✅ The correct answer is option A.
87. Combined carbon in iron makes the metal
soft and gives coarse grained crystalline structure
soft and gives a fine grained crystalline structure
hard and gives a coarse grained crystalline structure
hard and gives a fine
✅ The correct answer is option D.
88. The slow cooling of steel from the __________ results in a coarse grained structure.
lower critical point
upper critical point
✅ The correct answer is option B.
89. Nickel when added to copper improves
machinability
hardness
hardness and strength
strength and ductility
✅ The correct answer is option B.
90. The addition of copper to aluminium possesses maximum strength after heat treatment and age-hardening
Correct
Incorrect
✅ The correct answer is option A.