Trainee Chemical Engineer Interview Questions and Answers

Logarithmic temperature difference is used to analyze heat exchangers in counter current and co current flow. Graph shows efficiency vs temperature difference.

• Logarithmic temperature difference is a method to analyze heat exchangers in counter current and co current flow

• In counter current flow, the temperature difference decreases along the length of the exchanger, resulting in a steeper curve on the graph

• In co current flow, the temperature difference remains constant along t...read more

Surging and choking are phenomena that occur in pumps. Surging is the unstable flow condition where the flow rate fluctuates, while choking is the condition where the flow is restricted.

• Surging occurs when the flow rate through the pump exceeds the pump's capacity, causing the flow to become unstable.

• Choking happens when the flow rate is restricted due to a blockage or narrowing in the pump or piping system.

• Surging can be controlled by adjusting the pump speed or using surge ...read more

Burrets in urea production can be controlled by optimizing the process parameters and using anti-burret agents.

• Maintain proper temperature and pressure conditions in the reactor

• Ensure uniform distribution of reactants and catalyst

• Use anti-burret agents such as methanol or ammonia

• Regularly clean the reactor to prevent buildup of impurities

• Monitor the process closely to detect any deviations from the optimal conditions

Pump flowrate calculation involves using the formula Q= ha

• Calculate the flow rate (Q) by multiplying the head (h) by the area of the pipe (a)

• Ensure units are consistent (e.g. meters for head and square meters for area)

• Consider factors like friction loss and pump efficiency in the calculation

A reboiler is a heat exchanger used in a distillation column to generate vapor from the liquid feed at the bottom of the column.

• Reboilers can be classified into different types such as kettle reboilers, thermosiphon reboilers, and forced circulation reboilers.

• The type of reboiler used depends on factors like the properties of the feed, desired product purity, and energy efficiency.

• For example, a kettle reboiler is commonly used for simple distillation processes, while a force...read more