Pegasystems Interview Questions and Answers

Equal relative volatility means no separation is possible in distillation.

• Relative volatility is the ratio of vapor pressures of two components in a mixture.

• When it is equal to 1, the vapor pressures of both components are equal.

• This means they will boil and condense at the same temperature, making separation impossible.

• Distillation relies on the difference in boiling points of components to separate them.

• Therefore, distillation is not possible when relative volatility is equ...read more

To increase NPSHr when NPSHa is more, reduce the impeller diameter or increase the speed of the pump.

• Reduce impeller diameter

• Increase pump speed

Relative volatility is a measure of the difference in vapor pressures of two components in a mixture.

• It is used in distillation processes to determine the separation efficiency of a mixture.

• Higher relative volatility indicates easier separation of components.

• It is calculated as the ratio of vapor pressures of the two components.

• For example, in the separation of ethanol and water, ethanol has a higher relative volatility than water.

Distillation is a process of separating components of a mixture based on their boiling points.

• It involves heating the mixture to vaporize the component with the lowest boiling point.

• The vapor is then condensed and collected as a separate liquid.

• This process is commonly used in the production of alcoholic beverages, fuels, and essential oils.

• Fractional distillation is a variation of distillation that is used to separate components with closer boiling points.

• Distillation is als...read more

Types of NPSH and their differences

• Net Positive Suction Head (NPSH) is the difference between the absolute pressure at the pump suction and the vapor pressure of the liquid being pumped.

• Types of NPSH are available NPSH (NPSHa) and required NPSH (NPSHr).

• NPSHa is the amount of NPSH available at the pump suction, while NPSHr is the amount of NPSH required by the pump.

• The difference between NPSHa and NPSHr determines whether the pump will operate properly or experience cavitation...read more