Which one of the following represents open thermodynamic system?

Explanation:

In thermodynamics, we can classify the system into three types. They are as follows:

Closed System:

• There is no mass transfer across the system boundary but energy transfer takes place into or out of the system.
• The contents of a pressure cooker on a stove with its lid tightly closed and the whistle in position is a closed system as no mass can enter or leave the pressure cooker, but heat can be transferred to it. 
• A bomb calorimeter only allows heat to be exchanged. Such a system is called closed.

Open System:

• In this type of system both mass and energy, the transfer takes place across the boundary of the system. Examples include pumps, compressors, reactors, distillation columns, heat exchangers, etc.
• Centrifugal pump is an open system.

Isolated System:

• In this type of system, neither mass nor energy crosses the boundary of the system. So it is a system with fixed mass and fixed energy.
• A manual ice cream freezer is an isolated system.