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Materials and Construction

Materials and Construction
Locomotive boiler tubes are made of __________ alloys.

Magnesium
Nickel
Arsenic copper
Aluminium

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Materials and Construction
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

Low thermal conductivity
High co-efficient of thermal expansion
All of these
High corrosion resistance

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Materials and Construction
The electrical conductivity of a __________ decreases with rise in temperature.

Metal/alloy
Dielectric
None of these
Semi-conductor

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Materials and Construction
Carbon is present in the uncombined (graphitic) form in case of

None of these
Steel
Ferroalloy
Cast iron

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Materials and Construction
Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

One third
Half
One twelfth
One fifth

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Materials and Construction
The specific gravity of coal depends mainly on its __________ content.

Carbon
Moisture
Ash
Volatile matter

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