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Materials and Construction

Materials and Construction
__________ is a donor impurity for semi-conductors.

None of these
Antimony
Gallium
Boron

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Materials and Construction
Nickel made/clad equipments are suitable for handling

Nitric acid & hydrochloric acid (conc)
Ammonia (both aqueous & anhydrous)
Fruit juices, milk & its products and caustic soda solution
Sulphuric acid (conc)

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Materials and Construction
Which of the following is the easiest to bend?

Cast iron
Wrought iron
Stainless steel
Steel

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Materials and Construction
Mild steel storage vessels are suitable for the storage of

Anhydrous ammonia
Hydrochloric acid (95%)
Fatty acids
Sulphuric acid (25%)

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Materials and Construction
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel

Rubber
Nickel
Monel
Glass

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Materials and Construction
Nitriding of steel is done (in electric furnace) at __________ °C.

910
510
1720
2210

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