Exercise: Engineering Materials

Questions for: Engineering Materials

The temperature point at which the change starts on heating the steel is called
A:
lower critical point
B:
upper critical point
C:
point of recalescence
D:
point of decalescence
Answer: A
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The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.
A:
equal to
B:
less than
C:
more than
D:
Answer: B
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In the middle part of the blast furnace (zone of absorption), the temperature is
A:
400° to 700°C
B:
800°C to 1000°C
C:
1200°C to 1300°C
D:
1500°C to 1700°C
Answer: B
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When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of
A:
mainly pearlite
B:
mainly ferrite
C:
ferrite and pearlite
D:
pearlite and cementite
Answer: D
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A steel with 0.8% carbon is known as
A:
eutectoid steel
B:
hyper-eutectoid steel
C:
hypo-eutectiod steel
D:
none of these
Answer: A
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