Unit Operasi dan Fluida

What is a unit operation?

• A stage in an industrial process that only involves physical changes without chemical reactions

• A stage in an industrial process that plays a role in the separation process

• A stage in an industrial process that plays a role in purifying products

• A stage in an industrial process that involves chemical reactions or chemical changes to convert raw materials into new products

What are the classifications of unit operations?

• Physical, mechanical, chemical changes

• Fluid momentum transfer, heat transfer, mass transfer, mechanical operations

• Fluid transportation, heat transfer, liquid-liquid separation

• Fluid flow, separation, chemical product purification

A gas resulting from combustion consists of CO2, NO2, and SO2 with partial pressures of 100 mmHg, 50 mmHg, and 610 mmHg respectively. Calculate the mole fraction of CO2 in the exhaust gas mixture!

• 0.1538

• 0.0657

• 0.8026

• 0.1315

What is the correct statement about the following image?

• Hydrostatic pressure at each hole is the same, so the water flow speed is the same.

• Deeper holes have higher hydrostatic pressure, so the water flow is stronger.

• Water exits at the same speed from all holes because the volume of water in the vessel remains constant.

• Hydrostatic pressure above the vessel is greater, so the flow is weak.

What is the incorrect statement about the following image?

• Pressure of gas A is greater than atmospheric pressure

• Pressure at point 2 is the same as pressure at point 3

• Pressure at point 3 is influenced by atmospheric pressure and hydrostatic pressure of the fluid

• Pressure at point 2 is influenced by the pressure of gas A

What is a Newtonian fluid?

• A fluid that has a low viscosity

• A fluid that depends on the rate of shear stress

• A fluid that behaves linearly following Newton's law

• A fluid that has shear stress proportional to the rate of shear strain

What is the relationship between viscosity and the Reynolds number?

• The larger the viscosity of the fluid, the more turbulent the fluid flow will be

• The smaller the viscosity of the fluid, the more laminar the fluid flow will be

• Viscosity will be directly proportional to the Reynolds number

• The larger the viscosity of the fluid, the more laminar the fluid flow will be

Determine the flow of pure milk with a density of 1030 kg/m³ and viscosity of 10x10-3 Pa.s flowing at a speed of 2 m/s in a pipe.

Determine the flow of pure milk with a density of 1030 kg/m³ and a viscosity of 10x10-3 Pa.s flowing at a speed of 2 m/s in a pipe with a diameter of 0.05 m.

• Laminar with Reynolds number 10,300

• Laminar with Reynolds number 404.27

• Turbulent with Reynolds number 10,300

• Laminar with Reynolds number 1,030

When the velocity is low, the flow pattern will be stable and follow Newton's viscosity law, called flow

• Laminar

• Viscous

• Transition

• Turbulent