In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?
A. 2.5
B. 5
C. 12.5
D. 17.5
Month: March 2019
Flanges are connected to pipes by _______________________?
Flanges are connected to pipes by _______________________?
A. Screwing
B. Welding
C. Brazing
D. All A., B. and C.
Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower ?
Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower ?
A. Plate tower is preferred, if interstage cooling is required to remove heats of reaction or
solution
B. Plate tower is preferred over packed tower, if the operation involves liquids containing
dispersed solids
C. The total weight of a dry plate tower is usually much more than that of a dry packed tower
designed for the same duty
D. In operations involving large temperature changes. (e.g. distillation), plate towers are
preferred over packed towers as the packing may be crushed due to large temperature changes
Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?
Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?
A. Lug
B. Skirt
C. Saddle
D. Guy wire
In case of design of a shell and tube heat exchanger___________________?
In case of design of a shell and tube heat exchanger___________________?
A. Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
B. Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto
15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than
tube diameter
C. O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
D. All A., B. & C.
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___________________?
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___________________?
A. Increases
B. Decreases
C. Remain unaffected
D. None of these
The equivalent diameter for pressure drop is _______________ that for heat transfer?
The equivalent diameter for pressure drop is _______________ that for heat transfer?
A. Smaller than
B. Greater than
C. Equal to
D. Not related with
________________ liquor is best handled in a long tube vertical evaporator ?
________________ liquor is best handled in a long tube vertical evaporator ?
A. Foamy
B. Scaling
C. Viscous
D. Salting
In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?
In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?
A. Long tube vertical evaporator
B. Short tube vertical evaporator
C. Horizontal tube evaporator
D. None of these
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around______________________?
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around______________________?
A. 5 and 10
B. 45 and 75
C. 180 and 300
D. 300 and 500