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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

Cold working________________?
A increases the fatigue strength
B decreases the fatigue strength
C has no influence on fatigue strength
D alone has no influence on fatigue strength
Correct Answer: increases the fatigue strength
Which process will increase the fatigue duration of parts ?
A finishing and polishing
B shot-peening
C decarburisation
D electroplating
Correct Answer: shot-peening
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
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