Engineering Sciences
GATE XE topic:properties-applications-materials PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–20 of 79. Imported answers require independent review unless marked reviewed.
Question 59
Open questionXE-CNAT2 marksNeeds review
On applying 10 V across the two ends of a 100 cm long copper wire, the average drift velocity (in cm s
) in the wire is (rounded off to two decimal places) __________Given: Electron density of copper =
cm
Copper resistivity =
cmElectron charge =
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Open questionXE-CNAT2 marksNeeds review
An aluminum transmission line of 7 km length is designed to carry 100 A current with no more than 2 MW power loss. The required minimum diameter (in mm) of the transmission line is (rounded to two decimal places) ____________
Given: Aluminum conductivity =
cm
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Open questionXE-CNAT2 marksNeeds review
An electric field is applied on a copper plate such that the electrons are displaced by
m relative to the nuclei. The electronic polarization (in
C m
) is (rounded off to two decimal places)_________Given: Atomic number of copper = 29
Copper has FCC crystal structure with lattice parameter = 0.362 nm
Element charge =
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Open questionXE-CMCQ1 markNeeds review
Mechanical behaviour of a crystalline ceramic material is best described as
Your answerChoose one option.
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Open questionXE-CMSQ1 markNeeds review
Which of the following types of materials exhibit(s) positive magnetic susceptibility?
Your answerSelect all correct options. You can choose more than one.
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Open questionXE-CMCQ2 marksNeeds review
Which one of the following figures corresponds to the density of states
of a typical intrinsic semiconductor? (
represents the energy level of a charge carrier)Your answerChoose one option.
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Open questionXE-CMCQ2 marksNeeds review
Which one of the following curves best represents the E vs.
behavior of the hot end of a metal rod demonstrating Seebeck Effect? (
is the probability of electron occupancy at an energy state
;
is the Fermi energy)Your answerChoose one option.
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Open questionXE-CMSQ2 marksNeeds review
In a typical light emitting diode (LED), which of the following type(s) of materials is/are used?
Your answerSelect all correct options. You can choose more than one.
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Open questionXE-CNAT2 marksNeeds review
At room temperature, the electrical conductivity and electron mobility for aluminium are 3.8 × 10^7 (Ω m)^−1 and 0.0012 m^2 (V s)^−1, respectively. Density of free electrons for aluminium at room temperature is (in units of m^−3) ______ × 10^27 (rounded off to nearest integer).
Given: Electrical charge on an electron is 1.6 × 10^−19 C.
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Open questionXE-CNAT2 marksNeeds review
Consider a unidirectionally aligned continuous glass fiber reinforced epoxy composite with 40 vol. % reinforcement. The elastic modulus of the composite along the fiber direction is (in units of GPa) ________ (rounded off to one decimal place).
Given: Elastic modulus of epoxy is 6.9 GPa and that of glass fibre is 69 GPa.
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