Chemical Engineering Basics

241. Evaporative cooling process employs a combination of cooling and humidification in which the

1. Sensible heat is added
2. Sensible heat is removed and the latent heat is added
3. Latent heat is removed
4. Sensible heat is added and latent heat is removed

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242. Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

1. Film
2. Nucleate
3. Transition
4. All modes of

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243. Exposure to __________ accelerates the degradation of plastics.

1. Ultraviolet radiation
2. High atmospheric temperature
3. High ambient temperature
4. Damp atmosphere

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244. F_eO (s) + CO (g) = Fe (s) + CO₂ (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of F₂O at 1173 K?

1. 1
2. 1.3
3. 2.3
4. 3.3

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245. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.

1. Working
2. Bearing
3. Yield
4. None of these

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246. Factor of safety is the ratio of the __________ stress to the working stress.

1. Tensile
2. Compressive
3. Yield
4. Bearing

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247. Fahrenheit and Centigrade scales have the same readings at

1. -55°
2. -40°
3. -33°
4. -58°

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248. Faraday's law of electrolysis is related to the

1. Cation speed
2. Atomic number of the cation
3. Equivalent mass of the electrolyte
4. None of these

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249. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails

1. Below the yield point
2. Above the yield point
3. Below the elastic limit
4. At the elastic limit

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250. Fatigue resistance of a material is measured by the

1. Elastic limit
2. Ultimate tensile strength
3. Young's modulus
4. Endurance limit

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