Chemical Engineering Mcqs

Pick out the wrong statement ?

(A) In a flanged and standard dished head, the crown radius is ≤ shell outside diameter
(B) In a flanged and shallow dished head, the crown radius is > shell outside diameter
(C) Flat head covers are most suitable for larger vessels operating at very high pressure
(D) Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

Submitted By :Ali Uppal

Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?

(A) 1.5-2.5
(B) 3.5-5.5
(C) 7.5-10.0
(D) 10-15

Submitted By :Ali Uppal

Filtration rate is affected by the________________?

(A) Pressure drop across the cake & filter medium
(B) Cake & filter medium resistance
(C) Area of filtering surface & the viscosity of filtrate
(D) All

Submitted By :Ali Uppal

_____________ shaped roof is the most commonly used roof for cylindrical storage tanks?

(A) Conical
(B) Flat
(C) Dome
(D) Umbrella

Submitted By :Ali Uppal

The minimum shell thickness for tank ≤ 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?

(A) 2
(B) 5
(C) 10
(D) 15

Submitted By :Ali Uppal

A ‘rupture disc’ is provided in chemical equipments as an accessory meant for ___________________?

(A) Relieving excess pressure
(B) Creating turbulence
(C) Enhancing mixing rate
(D) Avoiding vortex formation

Submitted By :Ali Uppal

Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity) ?

(A) E
(B) ζ
(C) ζ/E
(D) E/ζ

Submitted By :Ali Uppal

Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?

(A) 250
(B) 450
(C) 650
(D) 750

Submitted By :Ali Uppal

A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by_______________?

(A) (ph – dh)/ph
(B) (ph – dh . dt/2)/ph
(C) (ph – dt)/ph
(D) (ph – dh)/dh

Submitted By :Ali Uppal

The ratio of linear stress to linear strain is termed as the ____________________?

(A) Modulus of elasticity
(B) Modulus of rigidity
(C) Bulk modulus
(D) None of these

Submitted By :Ali Uppal

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