Heat Transfer, Refrigeration and Air Conditioning Questions

• The radiation emitted by a black body is known as
• In case of liquids and gases, the heat transfer takes place according to
• The minimum temperature to which water can be cooled in a cooling tower is
• The specific humidity during heating and humidification process.
• The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.
• The boiling point of __________ is -10.5°C.
• The operating pressure for refrigerating units using R-12 as a refrigerant is
• The super-heating in a refrigeration cycle
• The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
• The thermostatic expansion valve operates on the changes in the
• According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.
• The superheated vapour region, in a pressure enthalpy chart, is represented by the space
• In a saturated air-water vapour mixture, the
• The freezing point of R-12 is
• The capillary tube is not used in large capacity refrigeration systems because
• The thermal diffusivity for gases is generally __________ those for liquids.
• The alignment circle is marked on the psychrometric chart at
• One tonne of refrigeration (1TR) means that the heat removing capacity is
• The freezing point of carbon dioxide is equal to boiling point of R-12.
• According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the