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Process Equipment and Plant Design

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)?

Process Equipment and Plant Design /
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

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)? Read More »

Process Equipment and Plant Design

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?

Process Equipment and Plant Design /
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?

A. Same as that for fluid flow
B. Less than that for fluid flow
C. More than that for fluid flow
D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________? Read More »

Process Equipment and Plant Design

At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?

Process Equipment and Plant Design /
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease depending upon the solubility of the gas in the liquid

At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________? Read More »

Process Equipment and Plant Design

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

Process Equipment and Plant Design /
In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed ______________ of the column diameter?

A. 1/5th
B. 1/15th
C. 1/30th
D. 1/50th

In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed ______________ of the column diameter? Read More »

Process Equipment and Plant Design

In a shell and tube heat exchanger, the clearance of the tube is generally___________________?

Process Equipment and Plant Design /
In a shell and tube heat exchanger, the clearance of the tube is generally___________________?

A. Not less than one-fourth of the tube diameter or 3/16″
B. More than the tube diameter
C. Equal to the tube diameter
D. More in case of triangular pitch as compared to the square pitch tube layout

In a shell and tube heat exchanger, the clearance of the tube is generally___________________? Read More »

Process Equipment and Plant Design

The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?

Process Equipment and Plant Design /
The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?

A. 0.6-0.8 times
B. Equal to
C. Twice
D. 2 ft irrespective of (for column > 3 ft diameter)

The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ? Read More »

Process Equipment and Plant Design

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

Process Equipment and Plant Design /
The necessary wall thickness for a metallic storage vessel is a function of the ___________________?

A. Ultimate tensile strength (or yield point) of the material and operating temperature
B. Operating pressure and welding/joint efficiency
C. Diameter of the vessel
D. All A., B. and C.

The necessary wall thickness for a metallic storage vessel is a function of the ___________________? Read More »

Process Equipment and Plant Design