Chemical Engineering Basics

431. Neutrons are present in all atoms except that of

1. He
2. C
3. H
4. Ar

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432. Nickel and __________ are the alloying element added in steel to increase its toughness.

1. Molybdenum
2. Chromium
3. Vanadium
4. Silicon

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433. Nickel is a __________ material.

1. Ferromagnetic
2. Semi-conductor
3. Paramagnetic
4. Ferroelectric

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434. Nitriding of a steel part does not increase its

1. Grain size
2. Fatigue limit
3. Surface hardness
4. Wear resistance

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435. Non-ferrous alloys used for making cutting tools need not have high

1. Abrasion resistance
2. Toughness
3. Red hardness
4. Cutting speed

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436. Normalising does not __________ of a metal.

1. Improve machinability & tensile strength
2. Remove internal stresses
3. Refine the structure
4. Remove strains caused by cold working

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437. Normalising of a casting does not

1. Induce stresses in it
2. Refine its grain structure
3. Reduce segregation
4. Improve its mechanical properties

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438. Normalising of an object does not

1. Refine coarse grain structure obtained during hot working
2. Improve ductility
3. Improve yield strength
4. Improve mechanical properties

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439. Notched bar test is used for testing the __________ of a material.

1. Impact strength
2. Endurance limit
3. Machinability
4. Corrosion resistance

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440. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

1. 20
2. 200
3. 500
4. 2000

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