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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 pipes is least corrosion resistant__________________?
A brass
B mild steel
C cast iron
D wrought iron
Correct Answer: wrought iron
High carbon steel carries carbon %age c_________________?
A 0.1 to 0.3%
B 0.3 to 0.6%
C 0.6 to 0.8%
D 0.8 to 1.5%
Correct Answer: 0.8 to 1.5%
The percentage of carbon in low carbon steel is__________________?
A 0.05%
B 0.15%
C 0.3%
D 0.5%
Correct Answer: 0.15%
Grey cast iron_____________________?
A contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
C is produced by annealing process. I is soft, tough and easily machinec metal
D is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
Correct Answer: contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
Nickel in steel___________________?
A improves wear resistance, cutting ability and toughness
B refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
C improves cutting ability and reduces hardenability
D gives ductility, toughness, tensile strength and anticorrosion properties
Correct Answer: gives ductility, toughness, tensile strength and anticorrosion properties
The presence of sulphur in pig iron makes__________________?
A it easily machinable
B it brittle
C it hard
D the casting unsound
Correct Answer: the casting unsound
Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
A 3- 5
B 5-7
C 7-10
D 10-15
Correct Answer: 5-7
Cupola produces following material__________________?
A cast iron
B pig iron
C wrought iron
D malleable iron
Correct Answer: cast iron
The following element can’t impart high strength at elevated temperature__________________?
A manganese
B magnesium
C nickel
D silicon
Correct Answer: magnesium
White cast iron__________________?
A contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C is produced by annealing process. It is soft, tough and easily machined metal
D is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Correct Answer: is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
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