The GATE Grind

GATE 2021 MT – Question 20

Physical Metallurgy · Heat treatment and recrystallization · 1 mark · Multiple choice

Which is the correct decreasing sequence of quenching power for steel heat treatment?

  1. Oil > Water > Brine > Air
  2. Brine > Oil > Water > Air
  3. Brine > Water > Oil > Air
  4. Water > Brine > Oil > Air

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Correct answer: (C) Brine > Water > Oil > Air

Explanation

Brine disrupts vapor blanketing more effectively than water, water extracts heat faster than oil, and air is slowest under the conventional comparison.

Thus **brine>water>oil>air, C**.