M C Q s D r i v e

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.

The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?
A best method
B extremely hazardous
C has no effect as regards fatigue strength
D cheapest method
Correct Answer: best method
Yield point in fatigue loading as compared to static loading is__________________?
A same
B higher
C lower
D depends on other factors
Correct Answer: lower
The fatigue limit of a material____________________?
A is greatly decreased by poor surface conditions
B remains same irrespective of surface conditions
C depends mainly on core composition
D is dependent upon yield strength of material
Correct Answer: is greatly decreased by poor surface conditions
The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
A 1 : l
B 2:1
C 3 : 2
D 2 : 3
Correct Answer: 3 : 2
The permissible stress for carbon steel under static loading is generally taken as__________________?
A 2000-3000 kg/pm2
B 3000-4000 kg/cm2
C 4000-4500 kg/cm2
D 7500-10,000 kg/cm2
Correct Answer: 4000-4500 kg/cm2
A hot short metal is_________________?
A brittle when cold
B brittle when hot
C brittle under all conditions
D ductile at high temperature
Correct Answer: brittle when hot
Rankine’s theory of failure is applicable for following type of materials___________________?
A brittle
B ductile
C elastic
D plastic
Correct Answer: brittle
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________?
A Brinell
B Rockwell
C Vicker
D Shore’s sceleroscope
Correct Answer: Brinell
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?
A decreasing the cross-section area of’ bar
B increasing the cross-section area of bar
C remain unaffected with cross-section area
D would depend upon other factors
Correct Answer: decreasing the cross-section area of’ bar
If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?
A be independent of ratio of mass of load W to mass of bar (y)
B increase with increase in y
C decrease with decrease in y
D depend on other considerations
Correct Answer: be independent of ratio of mass of load W to mass of bar (y)