Metallurgical Engineering
GATE MT year:2018 PYQs
Build your understanding with focused practice from past exam papers.
Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.
Question 51
Open questionMTNAT2 marksNeeds review
For the reaction: 4Ag(s, pure) + O
(g) → 2Ag
O(s, pure), the standard enthalpy change,
, and the standard entropy change,
, in the temperature range from 298 K to 500 K. The temperature above which Ag
O decomposes in an atmosphere containing oxygen at a partial pressure
is ______ (in K to one decimal place). Given: Gas constant R = 8.314 J K
mol
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Open questionMTNAT2 marksNeeds review
In a powder diffraction experiment on BCC iron, the first peak occurs at
. The wavelength of X-rays is ______ (in nm to three decimal places). Given: The lattice parameter of iron = 0.287 nmLog in to check the answer
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Open questionMTNAT2 marksNeeds review
A 1 mol piece of copper at 400 K is brought in contact with another 1 mol piece of copper at 300 K, and allowed to reach thermal equilibrium. The entropy change for this process is ______ (in J K
to three decimal places) Given: Specific heat capacity of copper (between 250 K and 500 K) is 22.6 J K
mol
. Assume that the system containing the two pieces of copper remains isolated during this process.Log in to check the answer
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Open questionMTNAT2 marksNeeds review
Using the trapezoidal rule with two equal intervals (n = 2, Δx = 1), the definite integral
______________ (to two decimal places).Log in to check the answer
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Open questionMTNAT2 marksNeeds review
The ideal plastic work involved in extruding a cylindrical billet of length 100 mm, from an initial diameter of 20 mm to a final diameter of 16 mm is ______ (in J to one decimal place). The flow stress in compression is 40 MPa, and remains constant throughout the process.
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