Chemical Engineering Basics

201. Current employed in resistance welding ranges from __________ kVA/cm².

1. 1.2 to 2.5
2. 4.5 to 6.2
3. 7.5 to 8.5
4. 10.5 to 15.5

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202. Damage to metal surface by mechanical action is called

1. Pitting
2. Corrosion
3. Erosion
4. None of these

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203. Density in the solid state is slightly less than that in its liquid state, in case of

1. Carbon dioxide
2. Water
3. Mercury
4. None of these

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204. Dephosphorization of molten pig iron is favoured by

1. Oxidising and basic slag
2. Reducing and basic slag
3. High activity co-efficient of phosphorous in metal
4. Oxidising and neutral slag

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205. Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.

1. Diminishing balance
2. Sinking fund
3. Multiple straight line
4. Sum of the years digit

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206. Desalination of water

1. Makes it potable
2. Makes it non-potable
3. Means distillation of water
4. None of these

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207. Dew point temperature always gives an indication of the __________ of the moist air.

1. Dryness
2. Moisture content
3. Coolness
4. Latent heat

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208. Diamagnetic materials

1. Are magnetised by eddy currents only
2. Are non-magnetic and cannot be magnetised
3. Are magnetised in direction opposite to the magnetic field
4. Can be magnetised in one direction only

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209. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

1. 10
2. 20
3. 30
4. 40

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210. Dielectric

1. Is an electrical insulating material
2. Of low resistivity is preferred
3. Should have high thermal conductivity
4. Need not defy the corrosive action of chemicals

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