Chemical Engineering MCQs

Page No. 454

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


aDecreases


bIncreases


cRemain constant


dFirst decreases upto certain temperature and then increases


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


bConvective heat transfer co-efficient


cEffective tube surface area for convective heat transfer


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


b2


c10


d100


View Answer 2

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


aTemperature gradient


bMechanical strength of the equipment


cHeat transfer area


dHeat transfer co-efficient


View Answer Heat transfer area

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


aPool


bPool


cTransition


dFilm


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


b71.2


c63.8


d48.7


View Answer 48.7

Agitated film evaporator is suitable for concentrating _____________ liquids?


aFoaming


bViscous


cVery thin


dCorrosive


View Answer Viscous

Kirchoff’s law is applicable to________________?


aMonochromatic radiation only


bTotal radiation only


cBoth A. and B.


dOnly volumes and not to surfaces


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


bVery low Grashoff number


cMolten metals


dAll A., B. and C.


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


b12.0 kW/m2


c14.6 kW/m2


d16.5 kW/m2


View Answer 16.5 kW/m2

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