Closed cycle system uses the fluid havinga.low viscosityb.low boiling pointc.high boiling pointd.high viscosity

1. Break Down the Problem

To determine the appropriate fluid for a closed cycle system, we need to assess the key properties of the fluid in relation to the requirements of such systems.

2. Relevant Concepts

In closed cycle systems, the fluid is typically used for heat transfer. The ideal properties of the fluid include:

• Viscosity: Affects the fluid's flow and pumping efficiency.
• Boiling Point: Must be high enough to prevent vaporization under operating conditions, but low boiling points can lead to faster heat dissipation.

3. Analysis and Detail

Let's consider each option:

1. Low Viscosity: While lower viscosity can improve flow efficiency, it may not be ideal under high pressure.
2. Low Boiling Point: This could be problematic because the fluid might evaporate, disrupting the cycle.
3. High Boiling Point: A fluid with a high boiling point remains a liquid under high temperatures encountered in many applications.
4. High Viscosity: Fluids with high viscosity can create resistance and require more energy to pump.

Hence, a high boiling point is preferable to maintain the liquid state under high temperatures, and viscosity must be moderated.

4. Verify and Summarize

In most closed cycle systems, the use of fluids with high boiling points is preferred to ensure that the fluid remains in liquid form during operation, thus maintaining the efficiency of the cycle. Low viscosity can be beneficial, but it should not compromise the ability to maintain the desired system pressure.

Final Answer

The fluid suitable for a closed cycle system is c. high boiling point.