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

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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

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cInertial

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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

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bParabolic

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cLinear

✓


dLogarithmic

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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

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View Answer 1/V̅ -0.8

Viscosity of gases ______________ with increase in temperature?


aIncrease very rapidly

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bIncrease slowly

✓


cDecrease slowly

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dRemain unaffected

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View Answer Increase slowly

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


aSaturated

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bSupersaturated

✓


cUnder-saturated

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dAll A., B. and C.

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View Answer Supersaturated

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