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Materials and Construction

Materials and Construction
Age hardening is concerned with

Silver
Brass
Duralumin
Copper

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Materials and Construction
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.

Antimony
Arsenic
Bismuth
Both B and C

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Materials and Construction
Diamagnetic materials are magnetised

Strongly
In a direction opposite to that of the applied field
Only slightly
With eddy currents only

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Materials and Construction
Purity of electrical grade aluminium should be ≥ __________ percent.

85
90
99.5
95

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Materials and Construction
Electronic structure of a material is generally studied by

X-ray
Electron diffraction
Metallurgical microscope
Spectroscopic techniques

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Materials and Construction
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

Molybdenum steel
Silicon steel
Chromium steel
None of these

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