Chemical Engineering MCQs

Page No. 467

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?


aDecrease


bIncrease


cRemain unchanged


dMay increase or decrease; depends on the pressure


View Answer Decrease

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?


a2


b20.8


c20.2


d20.5


View Answer 20.8

It is not preferable to use superheated steam in evaporators, because of its very_________________?


aHigh temperature


bHigh pressure


cLow film co-efficient


dNone of these


View Answer Low film co-efficient

_____________ heat exchanger is used for chilling oil to be dewaxed?


aU-tube


bDouble pipe


cFixed tube


dFloating head


View Answer Double pipe

If heat transfer rate varies with the time, it is termed as__________________?


aForced convection


bSteady state conduction


cMonochromatic radiation


dNone of these


View Answer None of these

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?


a165.4


b167.5


c172.5


d175


View Answer 165.4

The absorptivity of a body is equal to its emissivity _________________?


aAt a particular temperature


bFor circular bodies


cUnder thermal equilibrium


dNone of these



A perfect black body is a perfect _____________ of radiation?


aAbsorber


bEmitter


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

jH factor for heat transfer depends upon the ____________ number?


aBiot


bNusselt


cReynolds


dPrandtl


View Answer Reynolds

The actual temperature drop across the heating surface of an evaporator depends on the_______________?


aLiquid depth over the heating surface


bSolution being evaporated


cPressure difference between the steam chest and the vapor space above the boiling liquid


dAll A., B. and C.


View Answer All A., B. and C.

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