Chemical Engineering Basics

211. Dies for wire drawing are generally made of

1. Mild steel
2. Stainless steel
3. Carbides
4. High carbon steel

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212. Difference at any instant between the value of the controlled variable and the set point is called the

1. Deviation
2. Derivative time
3. Error ratio
4. Differential gap

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213. Diffusion co-efficient of a metal in a solid solution depends upon its

1. Composition
2. Temperature
3. Both (A) & (B)
4. Neither (A) nor (B)

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214. Direct conversion of thermal energy to electrical energy is facilitated by the

1. Fuel cells
2. Photo voltaic cell
3. Magneto hydrodynamic generator
4. None of these

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215. Dislocation cross-slip is difficult in those materials, which have

1. Large number of slip systems
2. High work hardening rate
3. Coarse grain size
4. Low stacking fault energy

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216. Dislocations are __________ defects.

1. Point
2. Line
3. Volume
4. None of these

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217. Dowtherm is a

1. High temperature heating medium (a petroleum product)
2. Product of coal tar distillation
3. Very heat sensitive material
4. None of these

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218. Drills are usually made of

1. Cermets
2. High speed steel
3. Alloy steel
4. Tungsten carbide

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219. Drossing is a __________ operation.

1. Smelting
2. Dressing
3. Roasting
4. Dressing

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220. Dry saturated steam can be converted into superheated steam by

1. Increasing its cross-sectional area of flow
2. Passing it through a pressure reducing valve
3. Forcing it downwards through a vertical tube
4. None of these

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