Metallurgical Engineering
2018 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE MT 2018 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 34–36 of 65. Imported answers require review unless explicitly marked reviewed.
Question 24
Open questionMTNAT1 markNeeds review
A plate of thickness h = 120 mm is cold rolled in a mill with a roll diameter of 200 mm. If the coefficient of friction
is 0.1, the maximum possible reduction
in a single pass is ______ (in mm to one decimal place)Log in to check the answer
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Open questionMTNAT1 markNeeds review
A copper-aluminium diffusion couple develops a certain concentration profile after an isothermal treatment at 600°C for 10 hours. The time required to achieve the same concentration profile at 500°C is ________ (in hours to 1 decimal place)
Given: The interdiffusion coefficient for copper in aluminium at 500°C and 600°C are
and
.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 26
Open questionMTMCQ2 marksNeeds review
The molar free energy (J mol
) of a liquid solution of a binary A-B alloy as a function of temperature (
) and composition (
, the mole fraction of B) is given by:
where
and
are the molar free energies of pure liquid A and pure liquid B. What is the excess molar free energy,
, for an alloy with
at
?Given: Gas constant R = 8.314 J K
mol
Your answerChoose one option.
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