Chemical Engineering Basics

491. Powder metallurgy technique is used in the production of __________ tools.

1. Tungsten carbide
2. High carbon steel
3. High speed steel
4. Drilling

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492. Preheating before welding is done to

1. Make the plate softer
2. Burn oil & grease sticking to plate surfaces
3. Avoid plate distortion
4. Prevent cold cracks

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493. Presence of nickel & chromium in steel does not raise its

1. Elastic limit
2. Machining properties
3. Ductility
4. Resilience

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494. Pressure exerted by a liquid depends upon its

1. Surface tension
2. Density
3. Viscosity
4. Buoyancy

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495. Pressure required to increase the density of water by about 1% is __________ atmosphere.

1. 10
2. 50
3. 200
4. 1000

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496. Primary designation of steel is based on its

1. Hardness & tensile strength
2. Carbon content
3. Iron content
4. Alloying elements content

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497. Principal alloying element in Elinvar (used for making hair springs for watches) is

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

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498. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

1. Cobalt, chromium & tungsten
2. Cobalt, chromium & nickel
3. Molybdenum, tungsten & chromium
4. Cobalt, zirconium & molybdenum

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499. Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

1. Pressure falls below the vapour pressure
2. Pressure becomes very high
3. Temperature becomes low
4. All 'a', 'b' & 'c'

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500. Production of a hollow product by inflation of a tube or parison is called the __________ process.

1. Blow moulding
2. Calendaring
3. Extrusion
4. Injection

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