Chemical Engineering Basics

261. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

1. Linearly
2. Exponentially
3. Logarithmically
4. Inversely

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262. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

1. 250
2. 500
3. 1000
4. 3000

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263. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

1. Increases
2. Decreases
3. Remain constant
4. Increases to a maximum before decreasing

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264. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?

1. Temperature - entropy
2. Temperature - pressure
3. Enthalpy - entropy
4. Enthalpy-pressure

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265. For an ideal gas, C_o - C_vis

1. R
2. -R
3. 0
4. (3/2) R

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266. For dynamic strain measurement, the Wheatstone bridge used is of __________ type.

1. Voltage sensitive null
2. Voltage sensitive deflected
3. Current sensitive deflected
4. None of these

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267. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be

1. 100% indirect reduction
2. 100% direct reduction
3. 50-60% indirect reduction
4. 30-40% indirect reduction

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268. For grinding of softer materials, the grinding wheel should have __________ grain size.

1. Finer
2. Coarser
3. Medium
4. Any type of

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269. For infinite parallel planes having emissivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1. (ε1 + ε2)/ε1.ε2
2. ε1.ε2/(ε1 + ε2 - ε1.ε2)
3. ε1.ε2
4. ε1 + ε2

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270. For preparation of porous bearings by powder metallurgy, preferred particle shape is

1. Spherical
2. Nodular
3. Irregular
4. No preferred shape

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