Hot dipping is a process of developing coating by

NCM Unit 6 Test

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Digambar Kashid
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20 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Dipping the substrate into an aqueous electrolyte at room temperature
Dipping the substrate in molten metal bath having low melting/fusion temperature
Dipping the substrate in a solution which reacts with the substrate surface to form a compound
Dipping the substrate in a aqueous electrolyte and passing electric current
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Galvanizing is the term used to indicate:
Zn coating
Fe coating
Al coating
Sn coating
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Aluminium is usually added while hot dip galvanizing of zinc for the following purpose:
Al reduces the melting point of zinc bath
Al suppresses the formation of Fe-Zn intermetallics
Al increases the oxidation of Zn bath
Al increases the strength of the coating
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Thin film coating by physical vapor deposition (PVD) is amenable to:
Only elemental metals
Only pure metals or metallic alloys
Only pure metals, alloys and intermetallic compounds
Pure metals, alloys, semi-conductors, intermetallic + non-metallic compounds, composites
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Identify the method from below which is not a typical PVD technique:
Direct current (DC)
Electro-plating
Ion plating
RF sputtering
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
PVD is most useful for:
All the below
Tribological application
Aesthetic coating
Semiconductor device fabrication
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
PVD is not effective to improve:
Wear resistance
Corrosion resistance
Oxidation resistance
Coefficient of friction
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