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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

Malleable cast iron _________________?

A contains l.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 cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Correct Answer: is produced by annealing process. It is soft, tough, and easily machined metal

Tungsten 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 properties
C improves cutting ability and reduces hardenability
D gives ductility, toughness, tensile strength and anticorrosion properties
Correct Answer: refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Which of the following is not the correct method of increasing fatigue limit __________________?

A shot peening
B nitriding of surface
C cold working
D surface decarburisation
Correct Answer: surface decarburisation

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
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