Chemical Engineering Basics

251. Ferromagnetic materials owe their properties to __________ inner sub-shells.

1. Completely filled
2. Partially filled
3. Equally filled
4. Vacant

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252. Lead is poured into the joint between two __________ pipes.

1. Mild steel
2. Concrete
3. Cast iron
4. Asbestos cement

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253. Fibre reinforced plastic (FRP) are

1. Made of glass fibre and thermoplastic resins
2. Anisotropic
3. Made of thermosetting resin and glass fibre
4. Both 'b' & 'c'

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254. Fibrous fracture is normally encountered in the __________ materials.

1. Hard
2. Elastic
3. Ductile
4. Brittle

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255. Filler material used in welding should have _________ as compared to the parent metal to be welded.

1. Lower melting temperature
2. Same melting temperature
3. Same composition
4. Both 'b' & 'c'

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256. Fine grained steels have

1. High brittleness
2. Higher tendency to distort
3. High ductility
4. None of these

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257. Fire in fuel gas pipelines is extinguished most effectively by

1. Spraying water
2. Blanketting the area with nitrogen atmosphere
3. Fire fighting foam
4. None of these

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258. Fire refining process is employed in case of

1. Tin
2. Copper
3. Zinc
4. Aluminium

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259. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater
Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?

1. A, C, B, D
2. D, B, C, A
3. D, C, B, A
4. D, A, B, C

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260. Fog is an example of colloidal system of

1. Solid dispersed in gas
2. Solid dispersed in liquid
3. Liquid dispersed in gas
4. Gas dispersed in liquid

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