61. Admirality gun metal contains
60% copper, 35% zinc and 5% manganese
76% copper, 20% silicon and 4% zinc
82% copper, 12% zinc and 6% manganese
88% copper, 10% tin an
✅ The correct answer is option D.
Engineering Materials MCQs
62. The malleability is the property of a material by virtue of which a material
regains its shape and size after the removal of external forces
retains the deformation produced under load permanently
can be drawn into wires with the application of a tensile force
can be rolled or hamme
✅ The correct answer is option D.
63. An alloy of copper, tin and zinc is known as
brass
bronze
gun metal
muntz metal
✅ The correct answer is option C.
64. Sulphur in cast iron
makes the iron soft and easily machinable
increases hardness and brittleness
makes the iron white and hard
aids fusibility and fl
✅ The correct answer is option B.
65. Babbit metal contains
50% tin and 50% antimony
66% tin, 30% copper and 4% antimony
88% tin, 4% copper and 8% antimony
92% tin, 6% copper and
✅ The correct answer is option C.
66. The machinability of steel is improved by adding
nickel
chromium
nickel and chromium
sulphur, lead and phos
✅ The correct answer is option D.
67. In a unit cell of a body centred cubic space lattice, there are __________ atoms.
six
nine
fourteen
seventeen
✅ The correct answer is option B.
68. A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
100 N/mm2
200 N/mm2
350 N/mm2
1000 N/mm2
✅ The correct answer is option C.
69. Cast iron has
high compressive strength
excellent machinability
good casting characteristic
all of these
✅ The correct answer is option D.
70. Which of the following metal is used for nuclear energy?
Uranium
Thorium
Niobium
all of these
✅ The correct answer is option D.