engineering materials MCQs – Page 7

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

engineering materials Mcqs
121. Drop forging dies contain carbon of the order of_________________?
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A. 0.6 to 0.7%

B. 0.25 to 0.5%

C. 0.7 to 0.9%

D. 0.1 to 0.2%

E. 1.0 to 1.2%.

122. Delta iron occurs at temperature of_______________?
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A. above melting point

B. between 1400C and 1539C

C. between 910C and 1400C

D. room temperature

E. none of the above

123. The machinability of steel is increased by___________________?
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A. silicon and sulphur

B. none of the above

C. phosphorous, lead and sulphur

D. sulphur, graphite and aluminium

E. phosphorous and aluminium

124. If a refractory contains high content of silicon, it means refractory is__________________?
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A. basic

B. neutral

C. acidic

D. none of the above

E. brittle

125. Corrosion resistance of steel is increased by addition of________________?
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A. zinc

B. sulphur, phosphorus, lead

C. chromium and nickel

D. vanadium, aluminium

E. tungsten, molybdenum, vanadium, chromium

126. Tungsten in steel________________?
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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

E. raises its melting point

127. White cast iron__________________?
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A. is produced by annealing process. It is soft, tough and easily machined metal

B. none of the above

C. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

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

E. 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

128. The transistor is made of___________________?
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A. germanium

B. german silver

C. copper

D. silver

E. gold

129. Tungsten in high speed steel provides________________?
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A. cold hardness

B. toughness

C. wear resistance

D. hot hardness

E. sharp cutting edge

130. The tensile strength of wrought iron is maximum _________________?
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A. along the lines of slag distribution

B. uniform in all directions

C. none of the above

D. perpendicular to lines of slag distribution

E. unpredictable

131. Austenite rs a combination of_________________?
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A. ferrite and iron graphite

B. pearlite and ferrite

C. ferrite and austenite

D. ferrite and cementite

E. cementite and gamma iron
132. Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?
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A. 60:40:00

B. 30 : 70

C. 50:50:00

D. 40 : 60

E. 70:30:00

133. Nodular iron has____________________?
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A. all of the above

B. high maehinability

C. low melting point

D. good fluidity

E. high tensile strength

134. Structural steel contains following principal alloying elements__________________?
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A. zinc, sulphur, and chromium

B. nickel, chromium and manganese

C. none of the above

D. tungsten, molybdenum and phosphorous

E. lead, tin, aluminium

135. Free cutting steels_____________________?
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A. contain carbon in free form

B. require least cutting force

C. are used where ease in machining is the criterion

D. can be cut freely even under adverse conditions

E. do not exist

136. Which is false statement about annealing. Annealing is done to________________?
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A. harden steel slightly

B. permit further cold working

C. soften material

D. relieve stresses

E. improve machining characteristic

137. The usual composition of a soldering alloy is__________________?
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A. tin and lead

B. tin, lead and silver

C. tin, copper and lead

D. tin, lead and small percentage of antimony

E. tin and copper

138. Gun metal contains__________________?
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A. 85-92% copper and rest tin with little lead and nickel

B. 85-92% copper and rest zinc

C. 90% copper and 10% tin

D. 70-78% copper and rest tin

E. 70% copper and 30% zinc

139. A specimen of aluminium metal when observed under microscope shows __________________?
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A. a complex cubic structure

B. F.C.C. crystal structure

C. B.C.C. crystalline structure

D. H.C.P. structure

E. orthorhombic crystalline structure

140. Pig iron is the name given to________________?
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A. product of blast furnace made by reduction of iron ore

B. iron scrap

C. raw material for blast furnace

D. iron in molten form in the ladles

E. iron containing huge quantities of carbon