Related Questions

Eutectoid reaction occurs at
A 600°C
B 727°C
C 1147°C
D 1493°C
Eutectoid composition of carbon steel at room temperature is
A Cementite
B Pearlite
C Martensite
D Ferrite
Steel with __________ carbon is known as hypo-eutectoid steel.
A 0.8%
B Below 0.8%
C Above 0.8%
D None of these
In process annealing, the hypo eutectoid steel is
A Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D Heated below or closes to the lower critical temperature and then cooled slowly
In a hardening process, the hypo-eutectoid steel is
A Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D Heated below or closes to the lower critical temperature and then cooled slowly
An eutectoid steel consists of
A Wholly pearlite
B Wholly austenite
C Pearlite and ferrite
D Pearlite and cementite
Eutectoid steel contains following percentage of carbon
A 0.02%
B 0.3%
C 0.63%
D 0.8%
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
A 723
B 959
C 1147
D 1493
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
A Less than
B Equal to
C More than
D Equal to or more than
A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.
A Less than
B Equal to
C More than
D Equal to or more than

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