engineering materials MCQs – Page 6

Practise focused engineering materials questions with marked answers for exam preparation and subject revision.

engineering materials Mcqs
101. Foundry crucible is made of_________________?
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A. mild steel

B. graphite

C. cast iron

D. lead

E. german silver

102. Argentite is the principal ore or raw material for _________________?
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A. silver

B. tin

C. aluminium

D. zinc

E. lead

103. Neutral solution is one which has pH value__________________?
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A. none of the above

B. greater than 7

C. pH value has nothing to do with neutral solution

D. less than 7

E. equal to 7
104. Pick up the wrong statement?
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A. manganese in steel induces hardness

B. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility

C. sulphur, phosphorous and lead improve machining properties of steel

D. tungsten in steels improves magnetic properties and hardenability

E. aluminium in steel results in excessive grain growth
105. Nickel in steel___________________?
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A. improves wear resistance, cutting ability and toughness

B. improves cutting ability and reduces hardenability

C. gives ductility, toughness, tensile strength and anticorrosion properties

D. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

E. none of the above

106. The metallic structure of mild steel is_________________?
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A. orthorhombic crystal

B. face centred cubic

C. body centred cubic

D. hexagonal close packed

E. cubic structure

107. Maximum percentage of carbon in ferrite is___________________?
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A. 0.25%

B. 0.06%

C. 0.10%

D. 0.8%.

E. 0.025%
108. Hardness of lower bainite (tempered martensite) is about________________?
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A. RC 57

B. RC 48

C. RC 32

D. RC 65

E. RC 80

109. Annealing of white cast iron results in production of_________________?
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A. grey iron

B. spheroidal iron

C. none of the above

D. nodular iron

E. malleable iron
110. Which of the following elements does not impart hardness to steel__________________?
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A. copper

B. chromium

C. silicon

D. none of the above

E. nickel

111. Heavy duty leaf and coil spring* contain carbon of the following order ________________?
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A. 1.0%

B. 0.50%

C. 1.5%.

D. 0.20%

E. 0.80%

112. Which of the following has highest specific strength of all structural materials__________________?
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A. chromium alloys

B. none of the above

C. titanium alloys

D. magnesium alloys

E. magnetic steel alloys

113. An engineers hammer is made of___________________?
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A. forged steel

B. high carbon steel

C. cast iron

D. mild steel

E. H.S.S

114. Pearlite is a combination of___________________?
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A. ferrite and cementite

B. cementite and gamma iron

C. pearlite and ferrite

D. ferrite and iron graphite

E. ferrite and austenite

115. Malleable cast iron _________________?
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A. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

B. none of the above

C. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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

E. is produced by annealing process. It is soft, tough, and easily machined metal
116. In mottled cast iron, carbon is available in__________________?
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A. nodular form

B. flat form

C. combined form

D. free form

E. partly in free and partly in combined state
117. Weld decay is the phenomenon found with _________________?
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A. wrought iron

B. non-ferrous materials

C. mild steel

D. cast iron

E. stainless steel
118. The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?
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A. increase

B. decrease

C. first decrease and then increase

D. first increase and then decrease

E. remain constant

119. Addition of lead and bismuth to aluminium results in_________________?
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A. improvement of casting characteristics

B. none of the above

C. improving machinability

D. improvement of corrosion resistance

E. one of the best known age and precipitation-hardening systems

120. Cast iron is characterised by minimum of following %age of carbon_________________?
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A. 2%

B. 1.30%

C. 6.3%.

D. 0.20%

E. 0.80%