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March 2019

Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________?

Process Equipment and Plant Design /
Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________?

A. hG = 1.004G0.37
B. 1.004G0.8
C. hG = 0.0176G0.37
D. 0.0176G1.37

Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________? Read More »

Process Equipment and Plant Design

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

Process Equipment and Plant Design /
The most common standard size of bubble caps used in industrial operation is___________________?

A. 1″ dia cap with 0.5″ dia riser
B. 6″ dia cap with 4″ dia riser
C. 8″ dia cap with 1″ dia riser
D. 4″ dia cap with 8″ dia riser

The most common standard size of bubble caps used in industrial operation is___________________? Read More »

Process Equipment and Plant Design

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?

Process Equipment and Plant Design /
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?

A. CO2
B. SO2
C. NH3
D. None of these

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ? Read More »

Process Equipment and Plant Design

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

Process Equipment and Plant Design /
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?

A. 0
B. ∞
C. 1
D. Minimum

The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________? Read More »

Process Equipment and Plant Design

Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?

Process Equipment and Plant Design /
Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?

A. 4-8
B. 17-34
C. 52-68
D. 88-105

Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height? Read More »

Process Equipment and Plant Design

The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?

Process Equipment and Plant Design /
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?

A. Equal sized reactors are the best
B. Smaller reactor should come first
C. Larger reactor should come first
D. None of these

The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________? Read More »

Process Equipment and Plant Design

The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?

Process Equipment and Plant Design /
The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?

A. 0.3 to 0.8
B. 1.25 to 3.125
C. 3.5 to 7.0
D. 8 to12

The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations? Read More »

Process Equipment and Plant Design

The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?

Process Equipment and Plant Design /
The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?

A. 0.5 to 1
B. 1 to 1.5
C. 1.5 to 2
D. 2 to 2.5

The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________? Read More »

Process Equipment and Plant Design

A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?

Process Equipment and Plant Design /
A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?

A. 5 mm
B. 6 mm
C. 8 mm
D. 10 mm

A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________? Read More »

Process Equipment and Plant Design