Introduction to material balance

A batch process is a process in which:

• no mass enters or leaves the system boundary during the process

• mass either enters or leaves the system boundary continuously during the process

• mass enters and leaves the system boundary continuously during the process

• none of these

A semi-batch process is a process in which:

• no mass enters or leaves the system boundary during the process

• mass either enters or leaves the system boundary continuously during the process

• mass enters and leaves the system boundary continuously during the process

• none of these

A continuous process is a process in which:

• no mass enters or leaves the system boundary during the process

• mass either enters or leaves the system boundary continuously during the process

• mass enters and leaves the system boundary continuously during the process

• none of these

An example of a batch process is:

• an AC which is running

• filling petrol in a car

• making juice in a blender

• water leaking from a tank

An example of a semi-batch process is:

• an AC which is running

• filling petrol in a car

• making juice in a blender

• baking a cake

An example of a continuous process is:

• a car engine while it is running

• filling petrol in a car

• emptying a filled water tank

• making coffee

Which of these could be a steady-state process

• batch process

• semi-batch process

• continuous process

• all of these

Which of these could be an unsteady-state process

• batch process

• semi-batch process

• continuous process

• all of these

When writing a balance for the total mass, which of these terms can be set as zero in the general balance equation?

• generation

• input

• output

• accumulation

When writing a balance for a steady-state process, which of these terms can be set as zero in the general balance equation?

• generation

• input

• output

• accumulation