Chemical Engineering Basics

21. __________ is not a case hardening process.

1. Carburising
2. Nitriding
3. Cyaniding
4. Annealing

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22. __________ is not a heat treatment process.

1. Cyaniding
2. Parkerizing
3. Austempering
4. Martempering

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23. __________ is not used as a material of construction in thermocouples.

1. Alumel
2. Rhodium
3. Constantan
4. Duralumin

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24. __________ is not used as the control rod material in a nuclear reactor.

1. Cobalt
2. Hafnium
3. Cadmium
4. Boron

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25. __________ is the hardest material out of the following.

1. Boron carbide
2. Tungsten carbide
3. Hardened steel
4. Silicon carbide

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26. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

1. Beryllium
2. Zirconia
3. Alumina
4. Magnesia

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27. __________ is the most important element, which controls the physical properties of steel.

1. Manganese
2. Silicon
3. Carbon
4. Vanadium

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28. __________ is the most suitable lubricant for drawing mild steel wires?

1. Kerosene
2. Water
3. Sodium stearate
4. Lime water

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29. __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

1. Veneering
2. Galvanising
3. Electroplating
4. Calorising

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30. __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

1. Lancing
2. Shot peening
3. Slugging
4. Spinning

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