Concepts of Material Balances Relating to Chemical Processes

This quiz contains problems on material balances.

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The material balance equation can be applied to

The total mass

A component’s mass

A component’s moles

All of the above

The material balance equation cannot be applied to

The total number of moles

An atomic species’s mass

An atomic species’s moles

All of the above

We do not use volume balance in a chemical process because

Mass is not conserved in a process

Volume is not conserved in a process

All of the above

Neither of the above

In a given tank, there are two feeds and one output. Consider a two-hour operation; the feed rates are 4000 kg/hr and 6000 kg/hr. The accumulated material inside the tank is 2000 kg. What is the output rate kg/hr of the material?

9000

8000

7000

6000

Based on the number of degrees of freedom, find the incorrect statement, considering
NU = Number of unknowns
NE = Number of unknown equations

NU = NE; for that a solution

NU > NE > 0; for that more independent equation required

NU< NE < 0; for that no solution exists unless some constraints are eliminated

None of the above

Any arbitrary portion of the process or the whole process considered for analysis is called

Surroundings

Boundary

System

None of the above

In a process, two feed streams are there and one output stream. The feed streams have feed rates of 500 kg/s and 600 kg/s. If the output stream rate is 800 kg/s, what is the mass stored in the chamber in five seconds?

300 kg

500 kg

1000 kg

1500 kg

__ is the line that encloses the process portion you want to analyse.

System

Surrounding

System boundary

None of the above

A system that does not have any material crossing the system boundary is called

Closed system

Open system