Mechanical Engineering MCQs

Page No. 35

The presence of sulphur in pig iron makes__________________?


ait easily machinable

✖


bit brittle

✖


cit hard

✖


dthe casting unsound

✓


View Answer the casting unsound

Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?


a3- 5

✖


b5-7

✓


c7-10

✖


d10-15

✖


View Answer 5-7

Cupola produces following material__________________?


acast iron

✓


bpig iron

✖


cwrought iron

✖


dmalleable iron

✖


View Answer cast iron

The following element can’t impart high strength at elevated temperature__________________?


amanganese

✖


bmagnesium

✓


cnickel

✖


dsilicon

✖


View Answer magnesium

White cast iron__________________?


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

✖


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

✓


cis produced by annealing process. It is soft, tough and easily machined metal

✖


dis 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

✖



Pipes for bicycle frames are made of___________________?


acold rolled steel

✓


bhot rolled steel

✖


cforged steel

✖


dcast steel

✖


View Answer cold rolled steel

Heavy duty leaf and coil spring* contain carbon of the following order ________________?


a0.2%

✖


b0.5%

✖


c0.8%

✖


d1.0%

✓


View Answer 1.0%

Drop forging dies contain carbon of the order of_________________?


a0.1 to 0.2%

✖


b0.25 to 0.5%

✖


c0.6 to 0.7%

✓


d0.7 to 0.9%

✖


View Answer 0.6 to 0.7%

The tensile strength of wrought iron is maximum _________________?


aalong the lines of slag distribution

✓


bperpendicular to lines of slag distribution

✖


cuniform in all directions

✖


dunpredictable

✖



Preheating is essential in welding ___________________?


acast iron

✓


bhigh speed steel

✖


call non-ferrous materials

✖


dall of the above

✖


View Answer cast iron

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