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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

A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
A molecular change
B physical change
C allotropic change
D solidus change
Correct Answer: allotropic change
Ferromagnetic alpha iron exists in temperature range of________________?
A below 723°C
B 770 – 910°C
C 910-1440°C
D 1400-1539°C
Correct Answer: below 723°C
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
A 770°C
B 910°C
C 1050°C
D below recrystallisation temperature
Correct Answer: 770°C
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
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