Industrial Maintenance Final Exam Review 2025

Alternating - -____ current is current that reverses its direction of flow at regular intervals. Voltage - -____ is the amount of electrical pressure that causes electrons to move in a circuit. Amperes - -Current is measured in ____. OCPD - -A(n) ____ is a device that automatically opens a circuit to prevent damage from a high-current condition. Contact - -A(n) ____ is the conducting part of a switch that operates with another conducting part to complete (close) or break (open) a circuit. Relay - -A(n) ____ is an electrical switch that is actuated by a separate circuit. Open - -A(n) ____ circuit is a circuit having an incomplete path, which prevents current flow. Resistance - -____ is the opposition to the flow of electrons. Conductor - -A(n) ____ is a material that has little resistance and permits electrons to move through it easily. Arcing - -____ is the discharge of an electric current across a gap. Short - -A(n) ____ circuit is an undesirable, low-resistance path for current to leave the normal current-carrying path through a load. Series - -A(n) ____ circuit is a circuit that has two or more components connected such that there is only one path for current flow. Insulator - -____ is a material that has a high resistance. Closed - -A(n) ____ circuit is a circuit having a complete path for current flow. Ground - -A(n) ____ circuit is a conducting connection between electrical equipment and the earth. Industrial Industrial Evaporator - -A(n) ____ is a heat exchanger through which heat is transferred to the low-pressure refrigerant liquid. Thermostat - -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. Air-cooled - -____ condensers are the most common condensers used in refrigeration systems. Latent - -____ heat is heat energy that causes a change of state but no temperature change. Condenser - -A(n) ____ is a heat exchanger that removes heat from high-pressure refrigerant vapor. Recovery - -Refrigerant ____ is the process of removing refrigerant from a system and capturing it in a recovery cylinder, with no cleaning of refrigerant. 15 - -A low-pressure boiler is a boiler that has an MAWP of up to ____ psi. 34.5; 212 - -A boiler horsepower is the power available from the evaporation of ____lb of water per hour at a feedwater temperature of ____F. 100,000 - -A therm is a unit of heat energy equivalent to ____ Btu. True - -T or F: A package boiler is preassembled at the factory. Primary - -____ air is air in the combustion process that regulates the rate of combustion. Heat - -Grade is a coal classification related to size, ash, and ____. Sensible - -____ heat is heat that can be measured by a change in temperature. Field-erected - -A ____ boiler is a boiler that is constructed on-site. Scanner - -A flame ____ is a safety device that senses if the pilot light and/or main flame is lit. 10; 11.5 - -Boiler water ph should be between ____ and ____. Dry - -____ lay-up is storage of a boiler with all water drained. Lubricant - -A(n) ____ is a substance that separates moving (bearing) surfaces to reduce the friction and/or wear between them. Industrial Industrial Number - -The gear diameter determines the ____ of teeth on a gear. Follower - -A cam ____ is a machine part that contacts the cam and moves in a designated path. Coupling - -A(n) ____ is a device used to connect a mechanical drive to a prime mover. Belt - -A(n) ____ is a flexible loop that connects two or more pulleys for transferring rotational power. Linear - -A(n) ____ bearing is a bearing designed to provide low-friction movement of a mechanical device that moves in a straight line. Spread - -Pullers are sized by pressure, wear, and ____. Anti-friction - -A(n) ____ bearing is a bearing that contains moving elements, which provide a low-friction support surface for rotating on sliding surfaces. Mechanical - -A belt drive is a(n) ____ drive system that uses a belt and pulleys to transfer power between two surfaces. Rigid - -A(n) ____ coupling is a device that joins two shafts that are precisely signed within a common frame. V - -____-belts are the most frequently used for belt drive systems. Reservoir - -A(n) ____ is a container for storing fluid under little or no pressure. Displacement - -____ is the volume of a hydraulic oil moved during each revolution, stroke, or cycle of a pump. Unloading - -____ is allowing a pump to run against little or no pressure. Accumulator - -A(n) ____ is a container in which fluid is stored under pressure. Pneumatic - -A(n) ____ system is a fluid power system that transmits energy using a gas (typically compressed air). Bleed off - -A(n) ____ valve is a valve that allows the pressure against the discharge valves to be released at startup. Gravity - -Single-acting cylinders have a piston in the cylinder that is extended by applied hydraulic oil pressure and retracted by weight, spring, and ____. Force - -____ is anything that changes or tends to change the state of rest or motion of a body. Industrial Industrial Pump - -A(n) ____ is a mechanical device that causes fluid to flow. Cavitation - -____ is the process in which microscopic gas bubbles expand in a vacuum and suddenly implode when entering a pressurized area. Cushion - -A(n) ____ cylinder is a cylinder that slows piston movement to provide a gradual stop. Reciprocating - -A(n) ____ compressor is a compressor that uses pistons moving back and forth to increase fluid pressure. True - -Safety is the most important concern when performing maintenance and troubleshooting work. Troubleshooting - -____ is the systematic elimination of the cause of system problems in order to determine the best solutions. Report - -A troubleshooting ____ is a record of a specific problem that occurs in a particular piece of equipment. Heat - -____ is a form of energy identified by temperature difference or a change of state. BTU - -A(n) ____ is the quantity of heat required to raise the