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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 machinability of steel is increased by___________________?
A silicon and sulphur
B phosphorous, lead and sulphur
C sulphur, graphite and aluminium
D phosphorous and aluminium
Correct Answer: phosphorous, lead and sulphur
Blast furnace produces following by reduction of iron ore_______________?
A cast iron
B pig iron
C wrought iron
D malleable iron
Correct Answer: pig iron
Melting point of iron is__________________?
A 1539°C
B 1601°C
C 1489°C
D 1712°C
Correct Answer: 1539°C
Which of the following elements does not impart hardness to steel__________________?
A copper
B chromium
C nickel
D silicon
Correct Answer: copper
The hardness of steel increases if it contains____________________?
A austenite
B martensite
C pearlite
D cementite
Correct Answer: martensite
Cobalt in steel __________________?
A improves wear resistance, cuttinability and toughness
B refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
C improves cutting ability and reduce hardenability
D gives ductility, toughness, tensile strength and anti corrosion property:
Correct Answer: improves cutting ability and reduce hardenability
Tensile strength of steel can be safely in-creased by________________?
A adding carbon up to 2.8%
B adding carbon up to 6.3%
C adding carbon up to 0.83%
D adding small quantities of copper
Correct Answer: adding carbon up to 0.83%
Connecting rod is usually made of_________________?
A aluminium
B low carbon steel
C medium carbon steel
D high carbon steel
Correct Answer: medium carbon steel
Tungsten in high speed steel provides________________?
A hot hardness
B toughness
C wear resistance
D sharp cutting edge
Correct Answer: hot hardness
Sulphur in steel________________?
A acts as deoxidiser
B reduces the grain size
C decreases tensile strength and hardness
D lowers the toughness and transverse ductility
Correct Answer: lowers the toughness and transverse ductility
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