Related Questions

The cold working of metals is carried out
A At the recrystallisation temperature
B Below the recrystallisation temperature
C Above the recrystallisation temperature
D At any temperature
Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
A Slip
B Fracture
C Winning
D Dislocation
The hot working of metals is carried out
A At the recrystallisation temperature
B Below the recrystallisation temperature
C Above the recrystallisation temperature
D At any temperature
Recrystallization temperature is one
A At which crystals first start forming from molten metal when it is cooled
B At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C At which change of allotropic form takes place
D At which crystals grow bigger in size
Recrystallization temperature can be lowered by
A Purification of metal
B Grain refinement
C Working at lower temperature
D All of the above
Cold working of steel is defined as working
A At its recrystallisation temperature
B Above its recrystallisation temperature
C Below its recrystallisation temperature
D At two thirds of the melting temperature of the metal
In cold working of metal as compared to its hot working
A Cracks and blow holes are eliminated
B Ductility and impact strength improves
C Appreciable strain hardening is produced
D Yield stress, hardness and fatigue strength is not at all affected
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
A Higher
B Much higher
C Lower
D Much lower
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
A Equal to
B More than
C Less than
D Either more or less than (depending upon the fluid)

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