4A Power Engineering - Unit 2 - Elementary Physical, Chemical, and Thermodynamic Principles Latest Version Graded A+

4A Power Engineering - Unit 2 - Elementary Physical, Chemical, and Thermodynamic Principles Latest Version Graded A+ The second law of Thermodynamics states: In order to transfer heat from a colder substance to a hotter substance,________________ must be supplied. External work To assure that air is properly vented from a heating or cooling coil: Supply water connection should be at the bottom of the coil. Saturated steam is: Steam at saturation temperature. In the steam tables, the unit used for pressure is: KPa Absolute. In the steam tables Hg is: Hf+Hfg The information found in column 8 of the steam tables (Hf) is the: Sensible Heat. The information found in column 9 of the steam tables (Hfg) is the: Latent heat of evaporation. Which type of heating coil circuiting is designed to produce a high heat capacity with limited water supply? Half serpentine. When the tempertature of an object is increased, it's change in length is proportional to its: Initial length and temperature increase. A bimetal thermometer consists of: Two dissimilar metals welded together. An example of a homogenous mixture is: Boiler flue gas. An example of a homogenous mixture is: Metal alloy. Radiators and convectors should be placed: Against outside walls and preferably under windows. With counterflow arrangement of air and water in a cooling or heating coil: The water supply connection is on the same side as the air leaving the coil. Heat that brings about a change of state is: Latent heat. Condensation losses in steam can be avoided by: Using super heated steam. One of the main considerations is the construction of radiators suitable for steam heating systems is: A large heating surface. In fin coil type heaters, individual room temperature is controlled by: Dampers. The fin surface area of a heating or cooling coil is called: Secondary surface area. Radiators were traditionally made of: Cast iron. Modern radiators are usually made of: Steel. What is a method used to ensure uniform steam distribution in steam coils: Installation of distibuting plates within the steam header. Unit heaters differ from convectors in that they use ______________ to increase heat transfer. Blowers. Steam containing water particles in suspension is defined as: Wet steam. Any material made up of distinct elements, compounds or both, that are not chemically combined with one another is a: Mixture. Any substance composed of two or more chemically combined elements is a: Compound. Fin spacing of 1.814 to 6.35 mm is most normally used for: Steam and hot water heating coils. An example of a physical change in mater is: The boiling of a refrigerant, melting point of ice. An example of chemical change is: