Chemical Engineering Basics

341. In chemical dehumidification of air

1. Both specific humidity & dry bulb temperature increases
2. Both specific humidity & dry bulb temperature decreases
3. Specific humidity decreases & dry bulb temperature increases
4. Specific humidity increases & dry bulb temperature decreases

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342. In chemical dehumidification process

1. Wet bulb temperature increases
2. Dry bulb temperature remains constant
3. Dew point temperature increases
4. Dry bulb temperature increases

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343. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

1. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
2. Maintaining vacuum on tube side is more difficult than that on the shell side
3. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
4. Condenser can act as a storage unit for condensed steam

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344. In connection with corrosion of metals, passivation is the process that

1. Intensifies deterioration
2. Changes the composition of the metal
3. Inhibits further deterioration
4. None of these

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345. In electrical resistance welding, distortion results from the use of improper

1. Clamping methods
2. Electrodes
3. Current
4. Filler material

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346. In extrusion of metals, which of the following statement is true?

1. Speed of the extruded material is same as that of ram speed
2. Redundant work is a function of the die angle
3. Relative motion between the billet surface and the container wall is always present
4. Hollow ram is used for indirect extrusion

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347. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (σ) and thermal diffusivity (α). The units of these quantities are.

1. μ , α and θ all have units of m/s
2. μ , α and θ all have units of m^2/s
3. α and θ have units of m^2/s, while μ has unit of m/s
4. α and θ have units of m/s, while μ has unit of m^2/s

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348. In inventory control theory, the economic order quantity (EOQ) is the

1. Lot size corresponding to break even analysis
2. Average level of inventory
3. Optimum lot size
4. None of these

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349. In multipass welds, shot peening is done after each pass to

1. Close the surface porosity
2. Break the continuity of columnar grains
3. Flatten the weldment
4. Introduce texture in the weld

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350. In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient).

1. V²
2. 1/V²
3. 1/V_g
4. V_g

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