Chemical Engineering Basics

301. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.

1. 5 to 10
2. 15 to 25
3. 45 to 50
4. 75 to 80

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302. High speed steel tools retain their hardness upto a temperature of __________ °C.

1. 500
2. 750
3. 900
4. 1100

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303. Highest cutting speed is achieved by the __________ tool material.

1. High speed steel
2. Carbide
3. Cast alloy
4. Plain carbon steel

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304. Holes for riveting purposes should be preferably made by

1. Cutting torch
2. Drilling
3. Punching
4. None of these

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305. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

1. Forging
2. Cold rolling
3. Hot rolling
4. Casting

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306. Hooke's law

1. Applies to elastic deformation
2. Applies beyond limit of proportionality in stress-strain curve
3. States that stress is inversely proportional to strain upto elastic limit
4. None of these

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307. Hot & cold working of material causes its __________ deformation.

1. Visco-elastic
2. Isotropic
3. Elastic
4. Plastic

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308. Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?

1. Galvanising
2. Tinning
3. Sherardizing
4. None of these

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309. Hot extrusion of aluminium is done in the temperature range of __________ °C.

1. 550-600
2. 450-500
3. 350-400
4. 250-300

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310. Hot extrusion process is not used for making

1. Cast iron pipe for domestic water supply
2. Aluminium curtain rods
3. Stainless steel tubes used in furnitures
4. Any of these

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