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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

Which is false statement about normalizing. Normalizing is done to _________________?
A refine grain structure
B reduce segregation in casting
C improve mechanical properties
D induce stresses-
Correct Answer: induce stresses-
Amorphous material is one___________________?
A in which atoms align themselves in a geometric pattern upon solidification
B in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C which is not attacked by phosphorous
D which emits fumes on melting
Correct Answer: in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
An example of amorphous material is____________?
A zinc
B lead
C silver
D glass
Correct Answer: glass
Which is false statement about case hardening. Case hardening is done by_______________?
A electroplating
B cyaniding
C induction hardening
D nitriding
Correct Answer: electroplating
Chromium in steel_________________?
A improves wear resistance, cutting ability and toughness
B refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C improves cutting ability and reduces hardenability
D gives ductility, toughness, tensile strength and anticorrosion properties
Correct Answer: improves wear resistance, cutting ability and toughness
Cemented carbide tools are not found to be suitable for cutting_______________?
A brass
B cast iron
C aluminium
D steel
Correct Answer: steel
Which of the following is the binding material in cemented carbides___________________?
A cobalt
B nickel
C vanadium
D iron
Correct Answer: cobalt
Which is false statement about tempering. Tempering is done to_______________?
A improve machinability
B improve ductility
C improve toughness
D release stresses
Correct Answer: improve machinability
Vanadium in high speed steels__________________?
A promotes decarburisation
B provides high hot hardness
C forms very hard carbides and thus in-creases wear resistance
D promotes retention of austenite
Correct Answer: forms very hard carbides and thus in-creases wear resistance
Hardness of lower bainite (tempered martensite) is about________________?
A RC 65
B RC 48
C RC 57
D RC 80
Correct Answer: RC 57
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