Materials and Construction

261. Most of the common metals have _________ crystal structure.

1. Cubic
2. Hexagonal
3. Orthorhombic
4. None of these

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262. Most suitable material for high pressure vessel operating at 500 atm. and 500° C is

1. Molybdenum stainless steel
2. 18/8 stainless steel
3. Mild steel
4. High silicon iron (14% Si)

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263. Most suitable material of construction for the storage of concentrated nitric acid is

1. Cast iron
2. Monel
3. Karbate
4. Aluminium or chromium alloys (Cr > 18% for cold acid)

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264. Muntz metal is a/an alloys of

1. Magnesium & tin
2. Ferrous material
3. Lead & tin
4. Copper & zinc

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265. Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of

1. Aluminium
2. Stainless steel
3. High silicon (14%) iron
4. Copper

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266. Nickel (56%) and molybdenum (17%) alloys are called

1. Monel
2. Hastelloy C
3. Inconel
4. Bronzes

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267. Nickel (76%) and chromium (15%) alloys are termed as

1. Inconel
2. Monel
3. Aluminium bronzes
4. Brass

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268. Nickel and copper are the basic constituents of

1. Hastelloy
2. Monel metal
3. German silver
4. Inconel

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269. Nickel and molybdenum are the basic constituents of

1. Hastelloy
2. German silver
3. Inconel
4. Solder

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270. Nickel as a material of construction

1. Is used as an alloying element for both ferrous & non-ferrous alloys
2. Is paramagnetic below 415° C (its Curie temperature)
3. Diamagnetic
4. Has a body centred cubic (bcc) crystal lattice structure

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