What is the correct answer?


Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

A. Tempering

B. Hardening

C. Annealing

D. Normalising

Correct Answer :

C. Annealing

Related Questions

Pick out the wrong statement. A solar cell converts the sunlight directly into __________ energy. For the Stoke's law to be valid in the case of a falling sphere in a fluid,… Which one can be directly solidified from gaseous state without entering… With increase in temperature, the electrical conductivity of semiconductors The most serious manufacturing defect from fracture toughness point of… Pipelines carrying various utilities in chemical industries are identified… Iron content in Indian iron ore is about __________ percent. __________ is a non volatile film forming constituent of a paint. The co-ordination number in simple cubic structure is Identify the correct statement. The trace metal present in insulin is Wohler test is a destructive test to find out the __________ strength… In a neutral solution Dislocation cross-slip is difficult in those materials, which have Which of the following if present in iron ore, enhances its value? X-rays are Dryness factor of steam is defined as the ratio of the mass of vapor in… Lead is poured into the joint between two __________ pipes. Electrostatic separation of minerals from each other is based on their… Yield strength of a polycrystalline metal with an average grain size d,… Out of the following the refractive index is the highest for Exposure to __________ accelerates the degradation of plastics. Square steel key is normally strong in failure by shear & crushing. Keys… Addition of __________ to steel does not help in improving its machinability. Between 230 and 370°C, blue brittleness is caused in mild steel because… Diameter of the rivet to be provided on a 20 mm. thick boiler plate will… The burnout heat flux in the nucleate boiling regime is not a function… The difference between gross & net calorific values of fuel is due to… The mechanism which changes the value of manipulated variable in response…