Chemical Engineering Basics

401. Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

1. Conductor
2. Insulator
3. Semi-conductor
4. None of these

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402. Matte smelting is used in the extraction of

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

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403. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

1. Grey
2. Black
3. Opaque
4. White

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404. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.

1. 0.01 to 0.10
2. 0.2 to 0.4
3. 0.5 to 0.7
4. 0.8 to 1.0

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405. Maximum consumption of limestone is in the __________ industry.

1. Iron and steel
2. Cement
3. Glass
4. Fertiliser

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406. Maximum hardenability of steel depends upon its

1. Chemical composition
2. Carbon content
3. Grain size
4. Alloying elements content

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407. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm.

1. 15
2. 25
3. 10
4. 30

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408. Maximum permissible air velocity in pipelines is about __________ metre/second.

1. 5
2. 10
3. 20
4. 40

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409. Maximum permissible sulphur content in steel is __________ percent.

1. 0.015
2. 0.055
3. 0.505
4. 0.805

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410. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

1. °C
2. °F
3. °K
4. °R

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