Chemical Engineering MCQs

Page No. 454

With increase in temperature, the thermal conductivity of non-metallic amorphous solids_________________?


aDecreases

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bIncreases

✓


cRemain constant

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dFirst decreases upto certain temperature and then increases

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View Answer Increases

Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?


aTube side pressure drop and the heat transfer rate

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bConvective heat transfer co-efficient

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cEffective tube surface area for convective heat transfer

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dAll A. B. and C.

✓


View Answer All A. B. and C.

Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?


a0.5

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b2

✓


c10

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d100

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View Answer 2

The main purpose of providing fins on heat transfer surface is to increase the_________________?


aTemperature gradient

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bMechanical strength of the equipment

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cHeat transfer area

✓


dHeat transfer co-efficient

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View Answer Heat transfer area

When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as ___________________ boiling?


aPool

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bPool

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cTransition

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dFilm

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View Answer Film

The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in °C is____________________?


a77.2

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b71.2

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c63.8

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d48.7

✓


View Answer 48.7

Agitated film evaporator is suitable for concentrating _____________ liquids?


aFoaming

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bViscous

✓


cVery thin

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dCorrosive

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View Answer Viscous

Kirchoff’s law is applicable to________________?


aMonochromatic radiation only

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bTotal radiation only

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cBoth A. and B.

✓


dOnly volumes and not to surfaces

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View Answer Both A. and B.

The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?


aLow Reynold’s number

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bVery low Grashoff number

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cMolten metals

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dAll A., B. and C.

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View Answer All A., B. and C.

The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is_____________________?


a11.2 kW/m2

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b12.0 kW/m2

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c14.6 kW/m2

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d16.5 kW/m2

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View Answer 16.5 kW/m2

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