Q1: The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

ANS:C - some

When non-condensing gases are present in the vapor, they can affect the film coefficient of both saturated and superheated vapor. However, the impact on the film coefficient can vary depending on several factors such as the type and concentration of the non-condensing gases, the temperature and pressure conditions, and the specific properties of the vapor. In some cases, the presence of non-condensing gases may slightly decrease the film coefficient of saturated vapor due to the interference of these gases with the condensation process, which can reduce the effectiveness of heat transfer. Conversely, for superheated vapor, the effect of non-condensing gases on the film coefficient can be more significant. The presence of these gases in superheated vapor can disrupt the thermal boundary layer and hinder heat transfer, leading to a reduction in the film coefficient. However, it's worth noting that the impact of non-condensing gases on the film coefficient can vary depending on the specific conditions and properties involved. In certain scenarios, the presence of non-condensing gases may not have a significant effect on the film coefficient of either saturated or superheated vapor, hence the possibility of the answer "some". Nonetheless, in most practical cases, the film coefficient of superheated vapor tends to be less than that of saturated vapor when non-condensing gases are present, due to the reasons mentioned earlier.