Chemical Engineering Mcqs

Crystallisation of solids from a homogeneous solution is a/an ______________ process?

(A) Exothermic
(B) Mildly endothermic
(C) Highly endothermic
(D) None of these

Submitted By :Ali Uppal

Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________?

(A) Hardness
(B) Dissolved solids content
(C) Suspended solids content
(D) All

Submitted By :Ali Uppal

_______________ paint has the maximum absorption coefficient ?

(A) Black
(B) Yellow
(C) White
(D) Grey

Submitted By :Ali Uppal

Baffles are provided in heat exchangers to increase the________________?

(A) Fouling factor
(B) Heat transfer area
(C) Heat transfer co-efficient
(D) Heat transfer rate

Submitted By :Ali Uppal

The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?

(A) q = [2π k (Ti + T0)/2]/ln (ri/r0)
(B) q = 2π ri k (Ti – T0)/(r0/ri)
(C) q = 2π k (Ti – T0)/(r0/ri)
(D) q = 2π k (Ti – T0)/[(r0 + ri)/2]

Submitted By :Ali Uppal

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

(A) Increase by 1.8 times
(B) Decrease by 22
(C) Increase by 216
(D) Remain unchanged

Submitted By :Ali Uppal

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?

(A) Condensation
(B) Grashoff
(C) Stanton
(D) Brinkman

Submitted By :Ali Uppal

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

(A) Forced convection
(B) Natural convection
(C) Transient conduction
(D) Steady state conduction

Submitted By :Ali Uppal

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?

(A) Cube
(B) Cylinder
(C) Sphere
(D) Equal for all the three

Submitted By :Ali Uppal

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

(A) Dittus-Boelter equation
(B) Sieder-Tate equation
(C) Nusselt equation
(D) None of these

Submitted By :Ali Uppal

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