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.
A. Nozzle or rim
B. Flared out
C. Fluid in
D. Ring plate
Select an option to see the answer and solution.
In the design of a bag filter, the gas temperature is an important consideration, as it affects the
A. Gas density
B. Gas viscosity
C. Fibre selection
D. All of the above
Select an option to see the answer and solution.
For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used?
A. 0.8
B. 0.9
C. 1.0
D. (0.8)0.5
Select an option to see the answer and solution.
Excessive liquid gradient on a tray may result in the
A. Maldistribution of gas
B. Back trapping
C. Gas blowing beneath cap skit
D. All of the above
Select an option to see the answer and solution.
The maximum liquid gradient over a tray must not exceed
A. 0.5" -1.25"
B. 2"-3.5"
C. 5"
D. Half the tray spacing
Select an option to see the answer and solution.
Safety valves are provided in chemical equipments to guard against excessive
A. Temperature
B. Pressure/pressure fluctuation
C. Turbulence
D. Noise
Select an option to see the answer and solution.
The stress developed in a material without any permanent set is called the
A. Ultimate stress
B. Yield stress
C. Elastic limit
D. Breaking stress
Select an option to see the answer and solution.
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).
Select an option to see the answer and solution.
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
A. 0.5 to 1.5
B. 2.5 to 4.0
C. 5 to 10
D. 10 to 15
Select an option to see the answer and solution.
A claming section before the liquid flows into the downcomer is privided to
A. Permit release of entrained vapour in the liquid
B. Reduce the discharge fluctuation
C. Ensure better vapour-liquid contact
D. Cool the liquid before it flows down
Select an option to see the answer and solution.
The function of manholes provided in the shell of a distillation column is to
A. Keep a check on the liquid gradient over the plate by direct visual observation
B. Give access to the individual trays for cleaning, maintenance and installation
C. Guard against foaming & entrainment by dumping antifoaming agent through it
D. All of the above
Select an option to see the answer and solution.
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
Select an option to see the answer and solution.
Pick out the wrong statement.
A. If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour
B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding
C. The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps
D. None of these
Select an option to see the answer and solution.
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
A. More
B. Same
C. Less
D. Twice
Select an option to see the answer and solution.
Fresh water carrying pipelines in chemical industries are coloured with __________ color.
A. Sea green
B. Brown
C. Yellow
D. Red
Select an option to see the answer and solution.
Pressure drop per tray in the atmospheric distillation column is about __________ psi.
A. 0.01 - 0.5
B. 0.07 - 0.12
C. 0.5 - 1.0
D. 1 - 3
Select an option to see the answer and solution.
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
What is the slope of the operating line in the rectifying section of a distillation coloumn?
Select an option to see the answer and solution.
Nominal size of a pipe is an indication of its __________ diameter.
A. Inner
B. Outer
C. Approximate
D. None of these
Select an option to see the answer and solution.
