Materials and Construction

271. Nickel base alloys with _________ are known as monel metal.

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

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272. Nickel is a constituent of

1. Bronze
2. Solder
3. Duralumin
4. Monel metal

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273. Nickel made/clad equipments are suitable for handling

1. Ammonia (both aqueous & anhydrous)
2. Fruit juices, milk & its products and caustic soda solution
3. Nitric acid & hydrochloric acid (concentrated)
4. Sulphuric acid (concentrated)

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274. Nitriding of steel is a process for

1. Case hardening
2. Spheroidising
3. Normalising
4. Annealing

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275. Nitriding of steel is done (in electric furnace) at _________ °C.

1. 510
2. 1720
3. 2210
4. 910

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276. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the _________ stress.

1. Ultimate
2. Yield point
3. Proof
4. None of these

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277. Out of the following, copper vessels are the most suitable for the storage of

1. Bromine
2. Dry chlorine & dry fluorine
3. Nitric acid (95% and fuming)
4. Phosphoric acid (95%) & sulphuric acid (95% and fuming)

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278. Percentage elongation of a material is a measure of its

1. Ductility
2. Brittleness
3. Toughness
4. Malleability

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279. Percentage of silver in German silver is

1. 5
2. 10
3. 20
4. 0

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280. Perspex is nothing but

1. Acrylic sheet
2. An elastomer
3. An alloy of lead and tin
4. Aluminium foil clad with Bakelite

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