Engineering Sciences
GATE XE exam:gate PYQs
Build your understanding with focused practice from past exam papers.
Questions 1641–1650 of 1772. Imported answers require independent review unless marked reviewed.
Question 44
Open questionXE-CNAT2 marksNeeds review
A continuous, aligned carbon fibre (CF) reinforced polymer composite with 30 vol% of CF and rest resin was designed for a specific application. The modulus of elasticity of CF is 17 GPa and that of the resin is 3.0 GPa. The modulus of elasticity for this composite in the direction of fibre alignment is ............GPa.
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Match the composites in Column I with the most suitable application in Column II
Column I
(P) Exfoliated silicates filled butyl rubber
(Q) Fiber reinforced aluminium alloy
(R) Silicon carbide whiskers reinforced alumina
(S) Carbon particles reinforced plastic composites
Column II
(1) Automobile pistons
(2) Contact lenses
(3) Ski boards
(4) Tennis balls
(5) Cutting tool inserts for machining
Your answerChoose one option.
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Match the processes in Column I with products in Column II
Column I
(P) Slip casting
(Q) Zone refining
(R) Sputtering
(S) Atomization
Column II
(1) Metal powders
(2) Thin films
(3) Ceramic parts
(4) Single crystal
(5) Metal sheets
Your answerChoose one option.
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The value of diffusivity (D) for the diffusion of carbon (C) in
-iron at 727 °C is............
m
/s
(Given D
= 2
m
/s; activation energy, Q = 142 kJ/mol; R = 8.314 J/mol. K)Log in to check the answer
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Refer to the figure below:
If the alloy contains 47 wt. % of A and 53 wt. % of B at 1300 °C, the wt. % of liquid present in the alloy at this temperature will be ........
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Which of the following statement(s) is/are true
(i) All piezoelectric materials are necessarily ferroelectric
(ii) All ferroelectric materials are necessarily piezoelectric
(iii) All pyroelectric materials are necessarily piezoelectric
(iv) All pyroelectric materials are necessarily ferroelectric
Your answerChoose one option.
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If the energy of formation of vacancies in pure copper is 0.9 eV, the fraction of vacancies in pure copper at 27 °C will be ..........
(Boltzmann’s constant is 8.62
eV/K)Log in to check the answer
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A ceramic material with a critical flaw size of 30
m has fracture stress of 300 MPa. For the same material the fracture stress for a critical flaw size of 90
m will be ..............MPa.Log in to check the answer
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An inorganic material that is transparent under solar light appears coloured when doped with transition metal ions. The possible reason(s) for the colour is/are
(i) The electronic energy levels of the host material changes significantly by doping
(ii) The doped element selectively absorbs certain wavelength of light other than the perceived color
(iii) The doped element emits radiation of specific wavelength
Which of the above statement(s) is/are true?
Your answerChoose one option.
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Copper is an FCC metal with lattice parameter of 3.62 Å. Hall effect measurement shows electron mobility to be 3.2
m
V
s
. Electrical resistivity of copper is 1.7
Ωm. The average number of free electrons per atom in copper is ....................(Charge of an electron: 1.6
C)Log in to check the answer
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