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Materials and Construction

Materials and Construction
Gas holder of a gobar (cowdung) gas plant is made of

Molybdenum stainless steel
Tin
Aluminium
Mild steel

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Materials and Construction
Which one has the maximum tensile strength out of the following?

Pig iron
Nodular cast iron
White cast iron
Grey cast iron

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Materials and Construction
Cast iron vessels are not suitable for the storage of

Freon
H₂SO₄ (fuming)
Wet SO₂
H₂SO₄ (95%) at room temperature

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Materials and Construction
Atmospheric corrosion of metals result from their

Fast hydration
Fast oxidation
Slow dehydration
Slow oxidation

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Materials and Construction
For platinum thermocouples, lead wires are made of

Copper & copper-nickel alloys
Iron & nickel
Tin & nickel
Copper & iron

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Materials and Construction
With increase in carbide/graphite ratio in cast iron, its

Both A & B
Neither A nor B
Ductility decreases
Hardness & brittleness increases

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