Industrial Maintenance Final Exam Review with Complete Solutions

Industrial Maintenance Final Exam Review with Complete Solutions ____ current is current that reverses its direction of flow at regular intervals. alternating ____ is the amount of electrical pressure that causes electrons to move in a circuit. voltage Current is measured in ____. amperes A(n) ____ is a device that automatically opens a circuit to prevent damage from a high-current condition. OCPD A(n) ____ is the conducting part of a switch that operates with another conducting part to complete (close) or break (open) a circuit. contact A(n) ____ is an electrical switch that is actuated by a separate circuit. relay A(n) ____ circuit is a circuit having an incomplete path, which prevents current flow. open ____ is the opposition to the flow of electrons. resistance A(n) ____ is a material that has little resistance and permits electrons to move through it easily. conductor ____ is the discharge of an electric current across a gap. arcing A(n) ____ circuit is an undesirable, low-resistance path for current to leave the normal current- carrying path through a load. short A(n) ____ circuit is a circuit that has two or more components connected such that there is only one path for current flow. series ____ is a material that has a high resistance. insulator A(n) ____ circuit is a circuit having a complete path for current flow. closed A(n) ____ circuit is a conducting connection between electrical equipment and the earth. ground A(n) ____ is a heat exchanger through which heat is transferred to the low-pressure refrigerant liquid. evaporator A(n) ____ is a temperature sensor inside a temperature-controlled space that sends signals to a control system in order to maintain a set temperature. thermostat ____ condensers are the most common condensers used in refrigeration systems. air-cooled ____ heat is heat energy that causes a change of state but no temperature change. latent A(n) ____ is a heat exchanger that removes heat from high-pressure refrigerant vapor. condenser Refrigerant ____ is the process of removing refrigerant from a system and capturing it in a recovery cylinder, with no cleaning of refrigerant. recovery A low-pressure boiler is a boiler that has an MAWP of up to ____ psi. 15 A boiler horsepower is the power available from the evaporation of ____lb of water per hour at a feedwater temperature of ____F. 34.5; 212 A therm is a unit of heat energy equivalent to ____ Btu. 100,000 T or F: A package boiler is preassembled at the factory. true ____ air is air in the combustion process that regulates the rate of combustion. primary Grade is a coal classification related to size, ash, and ____. heat ____ heat is heat that can be measured by a change in temperature. sensible A ____ boiler is a boiler that is constructed on-site. field-erected A flame ____ is a safety device that senses if the pilot light and/or main flame is lit. scanner