Chemical Engineering MCQs

Page No. 451

The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)?


aαT


bα × 1/T


cα T4


dIndependent of T


View Answer α × 1/T

The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is ______________ compared to the same size pipes without fins?


aMore


bLess


cSame


dUnpredictable


View Answer Less

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?


aTotal heat transfer area of all the effects is -less than that in a single effect evaporator system


bTotal amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect


cBoiling point elevation in a single effect system is much higher than that in any effect in a multi-effect system


dHeat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system



In a 1-1 concurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is_________________?


a


b0


cEqual to the difference between hot fluid inlet temperature and cold fluid outlet temperature


dEqual to the difference between hot and cold fluids inlet temperature


View Answer 0

Grashoff number, which is defined as g . β (Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to ____________ force?


aViscous


bElastic


cInertial


dNone of these


View Answer Viscous

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows ____________ law?


aHyperbolic


bParabolic


cLinear


dLogarithmic


View Answer Linear

Viscous & heat sensitive liquids are concentrated in _____________ evaporators?


aOpen pan


bLong tube


cAgitated film


dNone of these


View Answer Agitated film

In case of surface condensers, a straight line is obtained on plotting 1/U vs. ____________ on an ordinary graph paper?


a1/V̅ -0.8


bV̅ -0.8


cV̅ -2


d1/ V̅ -2


View Answer 1/V̅ -0.8

Viscosity of gases ______________ with increase in temperature?


aIncrease very rapidly


bIncrease slowly


cDecrease slowly


dRemain unaffected


View Answer Increase slowly

During crystallisation, formation of crystal can occur in ______________ solution only?


aSaturated


bSupersaturated


cUnder-saturated


dAll A., B. and C.


View Answer Supersaturated

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