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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 buckling load for a given material depends on___________________?
A slenderness ratio and area of cross-section
B Poisson’s ratio and modulus of elasticity
C slenderness ratio and modulus of elasticity
D slenderness ratio, area of cross-section and modulus of elasticity
Correct Answer: slenderness ratio, area of cross-section and modulus of elasticity
The value of modulus of elasticity for mild steel is of the order of________________?
A 2.1xl05 kg/cm2
B 2.1 X 106 kg/cm2
C 2.1 x 107 kg/cm2
D 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2
Correct Answer: 2.1 X 106 kg/cm2
If a part is constrained to move and heated, it will develop ____________________?
A principal stress
B tensile stress
C compressive stress
D shear stress
Correct Answer: compressive stress
Which is the false statement about true stress-strain method______________?
A It does not exist
B It is more sensitive to changes in both metallurgical and mechanical conditions
C It gives, a more accurate picture of the ductility
D It can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.
Correct Answer: It does not exist
For steel, the ultimate strength in shear as compared to in tension is nearly _________________?
A same
B half
C one-third
D two-third
Correct Answer: half
True stress-strain curve for materials is plotted between__________________?
A load/original cross-sectional area and change in length/original length
B load/instantaneous cross-sectional area original area and log
C load/instantaneous cross-sectional area and change in length/original length
D load/instantaneous area and instantaneous area/original area
Correct Answer: load/instantaneous cross-sectional area original area and log
Percentage reduction of area in performing tensile test on cast iron may be of the order of__________________?
A 50%
B 25%
C 0%
D 15%
Correct Answer: 0%
The impact strength of a material is an index of its ___________________?
A toughness
B tensile strength
C capability of being cold worked
D hardness
Correct Answer: toughness
Strain is defined as the ratio of__________________?
A change in volume to original volume
B change in length to original length
C change in cross-sectional area to original cross-sectional area
D any one of the above
Correct Answer: any one of the above
The materials having same elastic properties in all directions are called________________?
A ideal materials
B uniform materials
C isotropic materials
D paractical materials
Correct Answer: isotropic materials
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