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17969. The hardness of steel increases if it contains

September 14, 2025 by Admin

pearlite

ferrite

cementite

martensite

✅ The correct answer is option C.

Categories Engineering, Engineering Materials MCQs, Mechanical Engineering Tags Engineering Materials MCQs, Engineering MCQs, Mechanical Engineering MCQs

17968. The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

17970. The fire tubes in a Cochran boiler are

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