Stationary Engineer Exam Study Guide 2024, Exams of Engineering

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Correct Answers 2024

Cl2 - Correct Answer-Chlorine boiler - Correct Answer-equipment that provides hot water or steam for various uses PRV - Correct Answer-PRESSURE RELIEVE VALVE NOWL - Correct Answer-Normal operating water level BTU - Correct Answer-British Thermal Unit absolute pressure - Correct Answer-gauge pressure (psi) + atmospheric pressure (14.7 psi) at sea level air changes per hour - Correct Answer-The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation.

Air conditioner - Correct Answer-An appliance, system, or mechanism designed to dehumidify and extract heat from an area. Chiller - Correct Answer-A device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. This cooled liquid flows through pipes in a building and passes through coils in air handlers, fan-coil units, or other systems, cooling and usually dehumidifying the air in the building. Chillers are of two types; air-cooled or water-cooled. Air-cooled chillers are usually outside and consist of condenser coils cooled by fan-driven air. Water-cooled chillers are usually inside a building, and heat from these chillers is carried by recirculating water to a heat sink such as an outdoor cooling tower. Condenser - Correct Answer-A component in the basic refrigeration cycle that ejects or removes heat from the system. The condenser is the hot side of an air conditioner or heat pump. Controller - Correct Answer-A device that controls the operation of part or all of a system.

Dry Bulb Thermometer - Correct Answer-Dry bulb temperature is the temperature of air measured by a thermometer which is freely exposed to the air while it is shielded from radiation and moisture. It is usually thought of as air temperature, and it is the true thermodynamic temperature. It is a measurement of heat intensity independently of humidity and a dry bulb thermometer is used to measure it. Economizer - Correct Answer-An HVAC component that uses outside air, under suitable climate conditions, to reduce required mechanical cooling. When the outside air's enthalpy is less than the required supply air during a call for cooling, an economizer allows a building's mechanical ventilation system to use up to the maximum amount of outside Enthalpy - Correct Answer-For a given sample of air, a measure of the total heat content (the sum of the heat energy of the dry air and heat energy of the water vapor within it). It is typically used to determine the amount of fresh outside air that can be added to recirculated air for the lowest cooling cost.

psychrometric - Correct Answer-The study of the behavior of air-water vapor mixtures. Water vapor plays an important role in energy transfer and human comfort in HVAC design. Radiation - Correct Answer-The transfer of heat directly from one surface to another (without heating the intermediate air acting as a transfer mechanism) smoke damper - Correct Answer-A damper or adjustable louver designed to augment the ventilation of a space during a fire. subcooling - Correct Answer-A The condition where liquid refrigerant is colder than the minimum temperature required to keep it from boiling which would change it from a liquid to a gas phase. Subcooling is the difference between its saturation temperature and the actual liquid refrigerant temperature. VAV - Correct Answer-variable air volume An HVAC system that has a stable supply-air temperature, and varies the air flow rate to meet the temperature requirements. Compared to constant air volume systems, these systems conserve energy through lower fan speeds

during times of lower temperature control demand. Most new commercial buildings have VAV systems. VAVs may be bypass type or pressure dependent. Pressure dependent type VAVs save energy while both types help in maintaining temperature of the zone that it feeds. Abbreviated VAV. Absolute Humidity - Correct Answer-Absolute Humidity The weight of water vapor in a given amount of air space. Absolute humidity is measured by grains per cubic foot. Atmospheric Pressure - Correct Answer-Atmospheric Pressure The weight of a 1 square inch column of the earth's atmosphere. At sea level this pressure is 14.696 pounds per square inch. Chilled Water System - Correct Answer-Chilled Water System Type of air conditioning system that has no refrigerant in the unit itself. The refrigerant is contained in a chiller, which is located remotely. The chiller cools water, which is piped to the air conditioner to cool the space. Condensation - Correct Answer-Condensation

The process by which a gas is changed into a liquid at constant temperature by heat removal. Condensation Point - Correct Answer-Condensation Point The temperature at which the removal of any heat will begin a change of state from a vapor to a liquid. Condenser - Correct Answer-Condenser - A device that transfers unwanted heat out of a refrigeration system to a medium (either air, water, or a combination of air and water) that absorbs the heat and transfers it to a disposal point. There are three types of condensers 3 Condenser Types - Correct Answer-air-cooled condensers, water-cooled condensers, and evaporative condensers. The evaporative condenser uses a combination of air and water as its condensing medium. Most residential systems have an air- cooled condenser. Condensing Unit - Correct Answer-Condensing Unit Part of a refrigerating mechanism which pumps vaporized refrigerant from the evaporator, compresses it, liquefies it in the condenser and returns it to the refrigerant control. The

outdoor portion of a split system air conditioner contains the compressor and outdoor coil ignoring the reverse cycle operation, also the outdoor in a heat pump system. Economizer - Correct Answer-Economizer In a chiller with a two-stage centrifugal compressor, the discharge from the first stage impeller and the inlet to the second stage impeller are at a pressure level approximately half way between the cooler pressure and condenser pressure. With this arrangement, an economizer may be used. This is a shell within which refrigerant liquid from the condenser drops down to the interstage pressure, flashing off some of the refrigerant which is drawn directly into the second stage impeller. This reduces the amount of refrigerant which has to be compressed by the first stage impeller, improving the refrigeration cycle efficiency. Enthalpy - Correct Answer-Enthalpy Heat content or total heat, including both sensible and latent heat. The amount of heat contained in a refrigerant at any given temperature with reference to -40°F. HeatPump - Correct Answer-Heat Pump

An air conditioner that contains a valve that allows it to alternate between heating and cooling. Humidity - Correct Answer-Humidity The amount of moisture in the air. Relative humidity - Correct Answer-Relative humidity The ratio of the amount of vapor contained in the air to the greatest amount the air could hold at that temperature. Normally expressed as a percentage. Super-Heated Vapor - Correct Answer-Refrigerant vapor heated beyond its saturation point. Vacuum Pump - Correct Answer-A pump used to remove air and moisture from a refrigeration system at a pressure below atmospheric pressure. Water Cooled System - Correct Answer-Water Cooled System A type of air conditioning system that uses freon as a refrigerant and water as a condensing medium. Typically, the water-cooled condenser is located inside the air conditioner

with the rest of the refrigeration components. Water is piped to the unit from a cooling tower or other suitable source. Zoning - Correct Answer-Zoning The practice of providing independent heating and/or cooling to different areas in a structure. Zoning typically utilizes a system controller, zoning dampers controlled by a thermostat in each zone, and a bypass damper to regulate static pressure in the supply duct. Bolwdown Tanks - Correct Answer-Blowdown Tanks: Manage Temperature and Pressure Boiler blowdown tanks are used to reduce the pressure and temperature of the blowdown from a boiler. IN most states, it is unlawful to discharge blowdown directly into the sewer system. They typically require boiler blowdown to be reduced to a temperature of 140° F at a maximum pressure of 5PSIG. BDS Blowdown Separators - Correct Answer-BDS Blowdown Separators Precision Boilers' blowdown separators are used to temper high pressure boiler water to an acceptable drain temperature. They are used where space constraints preclude the use of blowdown tanks.

FT Flash Tanks - Correct Answer-FT Flash Tanks Boiler flash tanks are used in systems that require flashing of high pressure condensate to reduce its pressure and temperature before it is returned to the condensate receiver or discharged into the sewer. Flash tanks are provided with an inlet for condensate/steam, plus outlet, vent and drain connections. AIR ATOMIZING OIL BURNER - Correct Answer-A burner for firing oil in which the oil is atomized by compressed air, which is forced into and through one or more streams of oil which results in the breaking of the oil into a fine spray AIR VENT - Correct Answer-A valved opening in the top of the highest drum of a boiler or pressure vessel for venting air. ALKALINITY - Correct Answer-Represents the amount of carbonates, bicarbonates, hydroxides and silicates or phosphates in the water and is reported as grains per gallon, or ppm as calcium carbonate.

AQUASTAT - Correct Answer-Water limit temperature control, a safety device often used on boilers. ATOMIZER - Correct Answer-A device by means of which a liquid is reduced to a very fine spray. AVAILABLE DRAFT - Correct Answer-The draft which may be utilized to cause the flow of air for combustion or the flow of products of combustion. BAFFLE - Correct Answer-A plate or wall for deflecting gases or liquids. BAROMETRIC PRESSURE - Correct Answer-Atmospheric pressure as determined by a barometer usually expressed in inches of mercury. BLOWDOWN - Correct Answer-Boiler water that is removed from the boiler in order to maintain the desired concentration levels of suspended and dissolved solids in the boiler and removal of sludge.

BLOWDOWN SAFETY VALVE - Correct Answer-The difference between the pressure at which a safety valve opens and at which it closes. BLOWDOWN VALVE - Correct Answer-A valve generally used to continuously regulate concentration of solids in the boiler, not a drain valve. (Often called continuous blowdown.) BLOW-OFF VALVE - Correct Answer-A specially designed, manually operated, valve that connects to the boiler for the purpose of reducing the concentration of solids in the boiler or for draining purposes. (Often called bottom blowdown.) BLOWER - Correct Answer-A fan used to force air under pressure. BOILER - Correct Answer-A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity or nuclear energy.

BOILER HORSEPOWER - Correct Answer-The evaporation of 34-1/2 lbs of water per hour from a temperature of 212 °F into dry saturated steam at the same temperature. Equivalent to 33,475 Btu/hr. BOILER RATING - Correct Answer-The heating capacity of a boiler expressed in boiler horsepower, Btu/hour, or pounds of steam/hour. BREECHING - Correct Answer-A duct that transports the products of combustion between parts of a steam generating unit or to the stack. BRIDGEWALL - Correct Answer-A wall in a furnace over which the products of combustion pass. CaCO3 - Correct Answer-Calcium Carbonate. CALORIE - Correct Answer-The mean calorie is 1/100 of the heat required to raise the temperature of 1 gram of water from Zero C to 100 °C at a constant atmospheric pressure. It is about equal to the quantity of heat required to raise one gram

of water 1 °C. Another definition is: A calorie is 3600/ joules. CALORIMETER - Correct Answer-Apparatus for determining the calorific value of a fuel. CARRYOVER - Correct Answer-chemical solids and liquid entrained with the steam from a boiler. CARBON - Correct Answer-Element. The principal combustible constituent of all fuels. CHEMICAL FEED PIPE - Correct Answer-A pipe inside a boiler drum through which chemicals for treating the boiler water are introduced. COMPLETE COMBUSTION - Correct Answer-The complete oxidation of all the combustible constituents of a fuel. CONDENSATE - Correct Answer-Condensed water resulting from the removal of latent heat from steam.

CONTINUOUS BLOWDOWN - Correct Answer-The uninterrupted removal of concentrated boiler water from a boiler to control total solids concentration in the remaining water. CONTROL VALVE - Correct Answer-A valve used to control the flow of air, gas, water, steam or other substance. DAMPER - Correct Answer-- A device for introducing a variable pressure drop in a system used for regulating the volumetric flow of a gas, such as air. DEAERATION - Correct Answer-Removal of air and gases from boiler feed water prior to its introduction to a boiler. DOWNCOMER - Correct Answer-A tube or pipe in a boiler or waterwall circulating system through which fluid flows downward. DRAFT - Correct Answer-The difference between atmospheric pressure and some lower pressure existing in the furnace stack or gas passages of a steam generating unit.

DRY STEAM - Correct Answer-Steam containing no moisture. Commercially dry steam containing not more than one half of one percent moisture. ECONOMIZER - Correct Answer-Utilizes waste heat by transferring heat from flue gases to warm incoming feedwater. ELECTROSTATIC PRECIPITATOR - Correct Answer-A device for collecting dust, mist or fume from a gas stream, by placing an electrical charge on the particle and removing that particle onto a collecting electrode. EXPANSION JOINT - Correct Answer-The joint to permit movement due to expansion without undue stress. FEED PUMP - Correct Answer-A pump that supplies water to a boiler. FEEDWATER - Correct Answer-Water introduced into a boiler during operation. It includes make-up and return condensate.

FIRING RATE CONTROL - Correct Answer-A pressure temperature or flow controller which controls the firing rate of a burner according to the deviation from pressure or temperature set point. The system may be arranged to operate the burner on-off, high-low or in proportion to load demand. FLAME DETECTOR - Correct Answer-A device which indicates if a fuel (liquid, gaseous, or pulverized) is burning, or if ignition has been lost. The indication may be transmitted to a signal or to a control system. FLASHING - Correct Answer-The process of producing steam by discharging water into a region of pressure lower than the saturation pressure that corresponds to the water temperature FLUE - Correct Answer-A passage for products of combustion. FLASH POINT - Correct Answer-The lowest temperature at which, under specified conditions, fuel oil gives off enough vapor to flash into a momentary flame when ignited.

FOAMING - Correct Answer-The continuous formation of bubbles which have sufficiently high surface tension to remain as bubbles beyond the disengaging surface. ABT - Correct Answer-Automatic Bus Transfer, utility to UPS Air Ejector - Correct Answer-Type of Jet Pump used to remove air and other gases from a condenser Air Register - Correct Answer-Device in the casing of a boiler, used for regulating the amount of air for combustion and to provide a circular motion of air. Alloy - Correct Answer-Mixture of 2 or more metals Ammeter - Correct Answer-Instrument for measuring rate of flow of electrical current in amperes Annealing - Correct Answer-Softening of metal by heating and slow cooloing

Automatic Combustion Control System (ACC) - Correct Answer-A system that provides a means for automatically controlling fuel and air mixture Back Pressure - Correct Answer-Pressure exerted on the exhaust side of a pump or engine BDC - Correct Answer-Bottom Dead Center Boiler Design Pressure - Correct Answer-Pressure specified by OEM, usually about 103% of normal steam drum operation pressure Boiler internal fittings - Correct Answer-Parts in side of the boiler which control steam and water Boiler operating Pressure - Correct Answer-Pressure required to be maintained in a boiler while in service Boiler Refractories - Correct Answer-Materials used in the boiler to protect the boiler heat of combustion

Brazing - Correct Answer-Method of joining 2 metals at high temperature with a molten alloy Brine - Correct Answer-Highly concentrated solution of salt in water Brittleness - Correct Answer-Property of a material which causes it to fractureprior to any noticeable signs of deformation. Bushing - Correct Answer-A renewable lining for a hole for which moving parts pass through Check Valve - Correct Answer-A valve that permits for in only one direction Chlorine - Correct Answer-Heavy gas for water purification, sewage, disposal, CL2, Condenser - Correct Answer-Heat transfer device in which steam or vapor is condensed to water

Conduction - Correct Answer-Heat transfer through physical contact Constant Pressure Govener - Correct Answer-Device that maintains a constant pump discharge pressure under varying loads Controller - Correct Answer-Device used to start and stop and protect motors from over loads while running.