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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 of the following constituents of steels is softest and least strong ________________?
A austenite
B pearlite
C ferrite
D cementlte
Correct Answer: ferrite
A material is known as allotropic or polymorphic if it __________________?
A has a fixed structure under all conditions
B exists in several crystal forms at different temperatures
C responds to heat treatment
D has its atoms distributed in a random pattern
Correct Answer: exists in several crystal forms at different temperatures
Points of arrest for iron correspond to__________________?
A stages at which allotropic forms change
B stages at which further heating does not increase temperature for some time
C stages at which properties do not change with increase in temperature
D there is nothing like points of arrest
Correct Answer: stages at which allotropic forms change
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?
A increase
B decrease
C remain same
D first increase and then decrease
Correct Answer: increase
The ability of a material to resist softening at high temperature is known as____________________?
A creep
B hot tempering
C hot hardness
D fatigue
Correct Answer: hot hardness
Isotropic materials are those which have the same ____________________?
A elastic properties in all directions
B stresses induced in all directions
C thermal properties in all directions
D electric and magnetic properties in all directions
Correct Answer: elastic properties in all directions
Stress relaxation is- the phenomenon ___________________?
A in which parts are not loaded
B in which stress remains constant on in-creasing load
C in which deformation tends to loosen the joint and produces a stress reduced
D stress reduces on increasing load
Correct Answer: in which deformation tends to loosen the joint and produces a stress reduced
Mild steel belongs to the following category___________________?
A low carbon steel
B medium carbon steel
C high carbon steel
D alloy steel
Correct Answer: low carbon steel
Malleability of a material can be defined as ______________________?
A ability to undergo large permanent deformations in compression
B ability to recover its original form
C ability to undergo large permanent deformations in tension
D all of the above
Correct Answer: ability to undergo large permanent deformations in compression
Perminvar alloy having constant permeability is an alloy of________________?
A nickel, copper and iron
B nickel, copper and zinc
C copper, nickel and antimony
D iron, zinc and bismuth
Correct Answer: nickel, copper and iron
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