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March 2019

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?

Process Equipment and Plant Design /
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?

A. 2
B. 20.8
C. 20.2
D. None of these

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________? Read More »

Process Equipment and Plant Design

Optimum reflux ratio in a continuous distillation column is determined by the__________________?

Process Equipment and Plant Design /
Optimum reflux ratio in a continuous distillation column is determined by the__________________?

A. Maximum permissible vapour velocity
B. Flooding limit of the column
C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
D. None of these

Optimum reflux ratio in a continuous distillation column is determined by the__________________? Read More »

Process Equipment and Plant Design

In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?

Process Equipment and Plant Design /
In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?

A. Z.H.ρ/L
B. L/Z.H.ρ
C. H.ρ/L
D. Z.H/ρL

In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ? Read More »

Process Equipment and Plant Design

Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

Process Equipment and Plant Design /
Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

A. 0.01
B. 0.3
C. 0.75
D. 0.95

Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________? Read More »

Process Equipment and Plant Design

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?

Process Equipment and Plant Design /
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?

A. d = 1.1 t
B. d = 1.6 √t
C. d = 1.5 t
D. d = 3 √t

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________? Read More »

Process Equipment and Plant Design