Chemical Engineering Mcqs

In case of a ‘thin’ pressure vessel, the ratio of its diameter to wall thickness is_________________?

(A) < 10
(B) > 10
(C) > 20
(D) 30

Submitted By :Ali Uppal

Value of Peclet number = 0, is the representative of ____________________?

(A) Laminar flow
(B) Complete back mixing
(C) Plug flow
(D) Eddy diffusivity = 0

Submitted By :Ali Uppal

Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?

(A) Increases capacity
(B) Increases economy
(C) Does not affect the capacity
(D) Both

Submitted By :Ali Uppal

Value of Peclet number = ∞, is the representative of___________________?

(A) Laminar flow
(B) Complete back mixing
(C) Plug flow
(D) Eddy diffusivity = 0

Submitted By :Ali Uppal

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?

(A) Segmental baffle
(B) Flat plate extending across the wall
(C) Disk type baffle
(D) Helical type baffle

Submitted By :Ali Uppal

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?

(A) Working
(B) Damaging
(C) Allowable
(D) None of these

Submitted By :Ali Uppal

At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?

(A) Higher
(B) Lower
(C) Same
(D) Unpredictable

Submitted By :Ali Uppal

(Le/D) for a Tee (used as elbow, entering run) would be around _______________________?

(A) 5
(B) 60
(C) 160
(D) 200

Submitted By :Ali Uppal

Bubble cap tray is the most commonly used tray in large distillation column, because______________?

(A) Of its flexibility and nearly constant efficiency under varying conditions of operation
(B) It incurs less pressure drop as compared to any other try designed for the same duty
(C) It eliminates the foaming and entrainment tendency during operation
(D) None of these

Submitted By :Ali Uppal

Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always_________________?

(A) Less than arithmetic mean value
(B) More than arithmetic mean value
(C) More than geometric mean value
(D) Both

Submitted By :Ali Uppal

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