Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?()
In the process of (), liquid changes into gas.
Increasing the number of slack liquid tanks has effect of raising the().
The difference between a liquid and a gas is obvious (1)____ the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(describe) the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be “dissolved” in a vapor without losing its identity, and another theory held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.
The (7)____(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other (8)____, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.
Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its ().
Which of the following terms is used to identify the pressure of the liquid entering a pump?()
What type of liquid is used in the liquid P/V breaker().
() is not usually used in liquid cargo systems.
The interface between the liquid seal (water) and the oil should be positioned () possible to the bowl periphery.
A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the ().