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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 usual composition of a soldering alloy is__________________?
A tin, lead and small percentage of antimony
B tin and lead
C tin, lead and silver
D tin and copper
Correct Answer: tin, lead and small percentage of antimony
The crystal structure of brass is_________________?
A F.C.C.
B B.C.C.
C H.C.P.
D Orthorhombic crystalline structure
Correct Answer: F.C.C.
A specimen of aluminium metal when observed under microscope shows __________________?
A B.C.C. crystalline structure
B F.C.C. crystal structure
C H.C.P. structure
D a complex cubic structure
Correct Answer: F.C.C. crystal structure
Brass contains___________________?
A 70% copper and 30% zinc
B 90% copper and 10% tin
C 85-92% copper and rest tin with little lead and nickel
D 70-75% copper and rest tin
Correct Answer: 70% copper and 30% zinc
Steel made from phosphatic iron is_________________?
A brittle
B hard
C ductile
D tough
Correct Answer: brittle
Which one of the following metals would work-harden more quickly than the others__________________?
A copper
B brass
C lead
D silver
Correct Answer: brass
The composition of silver solder is ___________________?
A silver, copper, zinc
B silver, tin, nickel
C silver, lead, zinc
D silver, copper, aluminium
Correct Answer: silver, copper, zinc
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
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