ENGINEERING MATERIAL OBJECTIVE QUESTIONS/MCQ
Q51. When a material is subjected to fluctuating or repeated stresses, fracture takes place under a stress whose maximum value is less than the tensile strength of the material. This phenomenon is known as
Q52. When a material sustains steady loads for long periods of time, the material may continue to deform until they may tend to fracture under the same load. This phenomenon is known as
Q53. The melting point of mild steel is approximately
Q54. The capacity of a material to absorb energy in the elastic range is known as
Q55. The property of a material to resist penetration by another material is known as
Q56. The capacity of a metal to exhibit considerable elastic recovery upon release of load, is known as
Q57. Stellite is used for machining
(b) cast steel
(c) cast iron
(d) all of the above.
Q58. Which tool material is the hardest?
(a) ceremic tool
(b) steel tool
(c) diamond tools
(d) cemented carbide tools.
Q59. Choose the wrong statement
(a) Ceramic tools are brittle and tend to chip easily.
(b) Carbon steel is less wear resistant as compared to high speed steel.
(c) Diamond is the costly but hardest known material.
(d) Cemented carbide tools are manufactured primarily from aluminium oxide.
Q60. Choose the correct statement
(a) The ultimate strength, yield strength and elastic modulus of steel decreases with the increase of temperature.
(b) The ductile properties of steel increases with the increase of temperature.
(c) The steel used, for low temperature use, should have resistance to brittle fracture.
(d) All of the above.
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