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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

The percentage of carbon in pig iron varies from___________________?
A 0.1 to 1.2%
B 1.5 to 2.5%
C 2.5 to 4%
D 4 to 4.5%
Correct Answer: 4 to 4.5%
Pig iron is the name given to________________?
A raw material for blast furnace
B product of blast furnace made by reduction of iron ore
C iron containing huge quantities of carbon
D iron in molten form in the ladles
Correct Answer: product of blast furnace made by reduction of iron ore
In nodular iron, graphite is in the form of_____________________?
A cementite
B free carbon
C flakes
D spheroids
Correct Answer: spheroids
Wrought iron is________________?
A hard
B high in strength
C highly resistant to corrosion
D heat treated to change its properties
Correct Answer: highly resistant to corrosion
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
A allotropic change
B recrystallisation
C heat treatment
D precipitation
Correct Answer: allotropic change
Cast iron has_________________?
A high tensile strength
B its elastic limit close to the ultimate breaking strength
C high ductility
D all of the above
Correct Answer: its elastic limit close to the ultimate breaking strength
An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
A compressive strength
B ductility
C carbon content
D hardness
Correct Answer: ductility
Carbon steel is_______________?
A made by adding carbon in steel
B refined from cast iron
C an alloy of iron and carbon with varying quantities of phosphorus and sulphur
D extensively used for making cutting tools
Correct Answer: an alloy of iron and carbon with varying quantities of phosphorus and sulphur
‘Killed steels’ are those steels__________________?
A which are destroyed by burning
B which after their destruction are recycled to produce fresh steel
C which are deoxidised in the ladle with silicon and aluminium
D in which carbon is completely burnt
Correct Answer: which are deoxidised in the ladle with silicon and aluminium
The most effective inhibitor of grain growth, when added in small quantities is__________________?
A carbon
B vanadium
C manganese
D cobalt
Correct Answer: vanadium
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