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Chemical Engineering Basics

Chemical Engineering Basics
Boiler draught of 10 mm water column is equivalent to

10 kgf/mm²
1 kgf/m²
1 kgf/mm²
10 kgf/m²

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Chemical Engineering Basics
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

Cheaper
Lighter
Reduced preferentially
Oxidised preferentially

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Chemical Engineering Basics
Out of the following, the most ductile material is

Aluminium
Nickel
Copper
Mild steel

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Chemical Engineering Basics
In a casting, cold shut defect is caused by

Very low mould permeability
Low pounhg temperature
Faulty gating system
Melt-mould reactions

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Chemical Engineering Basics
On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is

Fatigue
Toughness
Tensile strength
Creep

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Chemical Engineering Basics
Frost formation on the evaporator tubes in the domestic refrigerators

Decreased compressor power
Is immaterial
Can be prevented by proper design
Causes heat loss due to poor heat transfer

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