PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

A/P

√A

4 A/P

4 P/A

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

HG = 0.0176G0.37

0.0176G1.37

1.004G0.8

HG = 1.004G0.37

TRUE ANSWER : ?
YOUR ANSWER : ?

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

More

Same

Twice

Less

TRUE ANSWER : ?
YOUR ANSWER : ?

The minimum baffle height should be

Twice the tank diameter

Twice the impeller diameter

Equal to the impeller diameter

3/4 of the tank height

TRUE ANSWER : ?
YOUR ANSWER : ?

In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Can accomodate less number of tubes for a given shell diameter

Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid

Results in higher shell side pressure drop

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the wrong statement pertaining to the design of the distillation column.

Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up

None of these

If sufficient slot area is not provided, the gas may pass through the skirt clearance

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

TRUE ANSWER : ?
YOUR ANSWER : ?

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

(ph - dh)/dh

(ph - dh . dt/2)/ph

(ph - dh)/ph

(ph - dt)/ph

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of a continuous distillation column, increase in reflux ratio may result in the

All of these

Greater cost for the reboiler heat supply

Lower fixed charges for the column

Greater cost for the condenser coolant

TRUE ANSWER : ?
YOUR ANSWER : ?

A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Corner torus section and central dished section

Central dished section and straight flange section

Central dished section and corner torus section

Straight flange section and corner torus section

TRUE ANSWER : ?
YOUR ANSWER : ?

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.

SO₂

NH₃

CO₂

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?