The most common standard size of bubble caps used in industrial operation is

Cooling water fouling factors vary in the range of 0.to 0.003

Needle valves are generally not used for

Which of the following types of reactors is the safest from operation point of view ?

Value of Peclet number = ∞, is the representative of

per cent cut segmental baffle means that the baffle

Saddle supports are used for supporting __________ vessels.

__________ strain is measured using a 'strain rosetter'.

Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )

Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the

In a bag filter, the pressure drop increases directly as the

For a given fluid, as the pipe diameter increases, the pumping cost

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

Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.

Low pressure steam (with saturation temperature betweento 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to amm mercury barometer).

The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normallytometres/minute.

Thin spherical shells subjected to internal pressure, develop __________ stresses.

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

The maximum liquid gradient over a tray must not exceed

Pick out the wrong statement.

The LMTD correction factor (F_T) is applied in __________ heat exchangers.

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

Maximum acceptable total liquid gradient over a tray is about __________ mm.

Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

Which of the following is the best tube material from thermal conductivity point of view alone?

In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.

With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

An underdesigned steam trap will

With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter

Accidents in chemical plants are mostly due to

Movement of pipeline caused by thermal expansion is taken care by providing

Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.

In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is

The necessary wall thickness for a metallic storage vessel is a function of the

Normal screwed fittings are used for pipes upto a diameter of __________ inches.

Optimum reflux ratio in a continuous distillation column is determined by the

The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is

The slope of the feed line in distillation opeartion is given by (where, q = fraction of the feed stream that is liquid.)

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

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.

Flanges are connected to pipes by

For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Weep holes provided in the plates of a distillation column

In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 towith the numbersandbeing more commonly used. Outside diameter of tubes varies from abouttomm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.