61. __________ does not contain tin as an alloying material.
Brass
Pewter
Solder
Babbit metal
✅ The correct answer is option A.
Materials and Construction MCQs
62. High degree of toughness is a must for
High speed steel
Shock resisting steel
Cold work tool steel
None of these
✅ The correct answer is option B.
63. The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability?
Lead
Copper
Aluminium
Wrought iron
✅ The correct answer is option A.
64. Which of the following alloying elements is present in maximum percentage in high speed steel.
Molybdenum
Chromium
Tungsten
Vanadium
✅ The correct answer is option C.
65. A measure of toughness of a material is its
Percentage elongation
Yield strength
Ultimate strength
Area under stress-strain diagram
✅ The correct answer is option B.
66. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.
Ultimate
Yield point
Proof
None of these
✅ The correct answer is option C.
67. Which one contains the least percentage of carbon?
Wrought iron
High speed steel
Cast iron
Pig iron
✅ The correct answer is option A.
68. Nitriding of steel is done (in electric furnace) at __________ °C.
510
1720
2210
910
✅ The correct answer is option A.
69. Spark plugs are made of
High alumina ceramic
Metallic carbides
Corundum
Carborundum
✅ The correct answer is option A.
70. Telfon (PTFE) is corroded by
Hydrochloric acid (10%)
Hydrochloric acid (95%)
Sulphuric acid
None of these
✅ The correct answer is option D.