__________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.

Pressure drop due to pipe fittings can be estimated by the equation,
, where, L_e = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (dimensionless) forelbow andclose return bends would be respectively around

In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.

The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

Maximum allowable vapour velocity in a bubble cap tower is determined by the

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

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

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter.

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

A cylindrical storage tank can have a self supported conical roof,

The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.

Which of the following lengths of heat exchanger tubes are normally not used in practice ?

Oxygen carrying pipelines in chemical industries are coloured with __________ colour.

Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.

The normal range of velocity of water in pipes is __________ m/sec.

Seamless pipe is made

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.

Baffles may be eliminated for

For high pressure process equipments/vessels, the connected nozzle should be

In inclined long tube vertical evaporators, the tubes are inclined at an angle of

The safe distance of habitation from a hazardous chemical plant (TLV of its product <ppm) should be about __________ kms.

The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

The equivalent diameter for pressure drop is __________ that for heat transfer.

A pipe is generally made of circular cross-section, because a circular cross-section has the

Pick out the wrong statement about the design of seive plate column and the bubble cap column.

The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

In condenser, the cooling water is passed in the tube side in a pass arrangement, because

Bubble cap plate column is

Baffle spacing is generally __________ the I.D. of the shell.

Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

The thickness of segmental baffles (-cut truncated plates usually) is generally __________ the tube wall thickness.

__________ of water makes it a widely used coolant in heat exchangers.

Pick out the wrong statement pertaining to a shell and tube heat exchanger.

Joint efficiency (J) for a seamless pipe is

The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder

In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (h_i) vanishes after a Reynold number of

Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ?

In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

In seive plate column, holes are drilled or punched in sizes ranging from 2.5 tomm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?