3rd Class Power Engineer (3B2) Practice Exam

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• What characterizes a "wetback" boiler design?
• A condenser shell may be fitted with an expansion joint if the:
• The primary purpose of a thrust bearing in a large reaction steam turbine includes which of the following?
• What kind of maintenance is typically required for boilers?
• Cogeneration systems with an IC engine connected to a HRWH can obtain good efficiency in _____ systems.
• What does the term "latent heat" refer to?
• What issue do liquid slugs from the evaporator cause in an absorption system?
• What helps keep condensers drained?
• In a gas turbine, what is one of the main benefits of high thermal efficiency?
• How does a fire-tube boiler differ from a water-tube boiler?
• Which pair of strategies can help decrease NOx emissions?
• In the context of compressors, what does the term "unloading" refer to?
• What components are included in fuel treatment systems?
• What type of system suggests the use of water level sensors?
• What is the most important component of a fuel metering system?
• What is a potential problem caused by hard water in boilers?
• In what situation is a draft fan most critical?
• What is the extraction pressure in an extraction turbine typically maintained as?
• What is the function of a flame scanner in fired heater operations?
• What advantage do gas turbines offer in terms of manpower?
• What is the control method for dry low NOx burners?
• Which components are typically found in a hot water heating system?
• What are common symptoms of water hammer in a boiler system?
• Refrigeration control can be achieved by regulating the flow of refrigerant to the evaporator and also by:
• Which of the following effects does air have in a surface condenser?
• Why are flame detection systems important in a boiler system?
• What is indicated by a high reading on a combustion analyzer?
• What does a combustion analyzer measure?
• What is the most common process method of refrigeration?
• In a rotary lobe compressor, how is the second lobe driven?
• What is the primary use of vibration accelerometers?
• What is the final step in the sequence of starting a gas turbine?
• What occurs during thermal expansion in a boiler system?
• What is the purpose of a boiler header?
• How does a boiler stack contribute to combustion efficiency?
• What are the disadvantages of using a regenerator in a gas turbine cycle?
• What is primarily used for starting gas turbines at remote gas pipeline stations?
• What is meant by "feedwater treatment"?
• Why is the air intake duct mounted above the gas turbine enclosure?
• What would be a consequence of neglecting water testing in a boiler system?
• Why is it important to maintain water quality in a boiler?
• Which statement is true about a magneto ignition system?
• Which components are found in a water-tube boiler?
• How is the horsepower of a boiler calculated?
• Which component controls suction pressure in refrigeration systems?
• Which component helps control combustion in the combustion chambers?
• Effective intercooling helps reduce the likelihood of which condition?
• Which two types of fuel are commonly used in boiler operations?
• What is the difference in enthalpy of ammonia at saturation conditions between 1165.8 kPa abs and 236.2 kPa abs?
• In terms of maintenance, why is the chemical balance in boiler water important?
• What is a primary cause of noise in boiler systems?
• Which cogeneration system description fits best with the following? "A gas turbine compressor supplies pressurized combustion air which is burned in a boiler, producing steam that drives a steam turbine connected to a generator."
• In a multi-stage, reciprocating compressor, how are the highest pressure stages typically configured?
• What type of water treatment method is reportedly effective in removing salts and impurities?
• How are pressures and temperatures managed in dual shaft gas turbines?
• In a steam system, what process would occur to maintain system efficiency when condensate forms?
• When does loading begin on a turbine system?
• How does air typically enter a condenser?
• How often should routine maintenance on a gas turbine check for fuel leaks?
• What is the purpose of a steam dome in a boiler?
• What typically is removed from the steam system by a steam trap?
• Which function do moving blades in a reaction turbine serve?
• How is power extracted in a gas turbine?
• What method is used to perform a water wash on a turbine?
• What is one function of the heat transfer surfaces in a boiler?
• What does thermal efficiency of a boiler indicate?
• How does ambient temperature impact boiler efficiency?
• Why is it important for the thermal efficiency of a boiler to be high?
• The hyperbolic cooling tower has the advantages of:
• What is the main function of a mechanical draft system in a boiler?
• What type of heat exchanger is installed to counter the corrosive nature of condensate from high sulphur content fuel?
• What role does a condenser serve in a steam system?
• How is startup accomplished after a trip?
• What happens to the rotor speed after the fuel valve closes during shutdown?
• What is the function of a blowoff valve in a boiler?
• Turbine inlet air temperature affects which aspect of turbine operation?
• What type of condenser only draws the required quantity of feed water for the boiler?
• What impacts the warm-up time required for a turbine?
• What is the ideal pressure range for typical steam operations?
• What is one effect of impurities present in steam?
• Where should pressure limiting devices of refrigeration systems be connected?
• What is the primary function of a boiler?
• What impact do slugs of liquid have in an absorption system compared to a compression system?
• What is the primary function of a chimney in a boiler system?
• Why is proper management of thermal expansion important in a boiler?
• What routine measure can enhance the performance of a boiler?
• What is the main function of a regenerator in a gas turbine system?
• Small turbines used for driving auxiliary equipment are usually lubricated using which method?
• Which of the following contributes to boiler efficiency?
• What is the primary function of the recycle valve?
• What does the term "thermal conductivity" describe?
• What is one method of preventing corrosion in boilers?
• What is the purpose of boiler blowdown?
• What type of valve activates an inlet air unloader in response to receiver pressure?
• How is reheat accomplished in a gas turbine?
• Why is a water column gauge significant in a boiler?
• During which procedure is the turbine isolated from the operational system?
• The design of the HRSG in a cogeneration system depends on which of the following?
• Which method is used to reduce inlet air temperatures for gas turbines?
• What is the function of an economizer in a boiler?
• Which type of material do bacteria in activated sludge primarily feed on?
• What happens if a pressure gauge is malfunctioning?
• Low-pressure feedwater heaters are exposed to the discharge pressure of which pump?
• When is a fuel gas compressor required on gas turbines?
• What does the acronym "TDS" stand for in the context of boiler operations?
• In a two-stage refrigeration system, what is the first stage compressor known as?
• What is the effect of the recycle valve on turbine performance?
• What is a common feature of reciprocating compressors?
• What is one method for unloading a reciprocating compressor?
• What is the primary function of a draft fan in a combustion system?
• When is a convergent-divergent nozzle used in relation to steam turbine nozzles?
• Which fuel type is generally more efficient for boilers in residential settings?
• Which of the following is an advantage of a gas turbine?
• What occurs during condensation in steam systems?
• What specific hazard does a low-pressure switch prevent in a boiler?
• Which device is typically not used for starting a gas turbine?
• How can the efficiency of a heating system be improved?
• What principle allows steam to rise in a boiler system?
• What is one hazard associated with boiler operations?
• Why is scale buildup a concern in boiler operations?
• What is one purpose of auxiliary systems on gas turbines?
• What is the primary function of superchargers in diesel engines?
• What is one disadvantage of gas turbines compared to other power generation systems?
• Why are there fewer turbine stages than compressor stages in a gas turbine?
• Reciprocating Compressor valves are usually automatic and open and close by:
• What happens to steam in a superheated state?
• Which of the following describes a method of water treatment?
• Which of the following statements is true about the Fixed Tube Sheet shell and tube exchanger?
• In a gas turbine setup, what is the role of the regenerator?
• How does the presence of water droplets affect steam quality?
• What is a good method of removing moisture from air before it goes into the air receiver?
• Where are thrust bearings located in dual shaft gas turbines?
• What is a crucial requirement for turning gears?
• What does the term 'saturation conditions' refer to in thermodynamics?
• What type of bearing oiling method is commonly used for small auxiliary turbines?
• What is a key benefit of the cooling capability in gas turbine systems?
• What is the purpose of a low-side float control in refrigeration systems?
• Where are regenerators installed in a gas turbine system?
• What is the initial requirement for starting up a unit after a trip?
• What material are reciprocating compressor connecting rods typically constructed of?
• Which of these is a common type of fuel used in modern boilers?
• What is the primary purpose of a steam boiler's insulation?
• What does a low-pressure switch do in a boiler system?
• What role does a steam trap perform?
• What is the primary purpose of purging a furnace before igniting it?
• What is the main purpose of an expansion tank in a heating system?
• In a pressure-velocity compounded turbine, how many pressure-compounded stages can there be?
• What occurs to turbine rotor speed at shutdown?
• In a package industrial screw compressor, where is the silicone-based fluid removed?
• What role does a boiler header play in steam generation?
• How is the cleaning of a gas turbine typically accomplished?
• What is the function of a boiler stack?
• What is one benefit of using water injection systems in gas turbines besides reducing NOx?
• What is the role of a pressure gauge on a boiler?
• What is a potential consequence of using anti-icing systems?
• Why is water testing crucial in boiler operations?
• Which type of compressor uses rotors for compression?
• What does "pump cavitation" typically indicate?
• Which system component is crucial for maintaining both water quality and boiler longevity?
• What contributes to the rapid starting capability of gas turbines?
• What does boiler scale refer to?
• Which factors influence steam quality?
• When is the stop and start system best employed?
• What distinguishes saturated steam from superheated steam?
• What is the significance of boiler efficiency?
• When should the cooling water to the oil cooler be turned on during the startup of a large condensing turbine?
• In a gas turbine cycle using an intercooler, which of the following advantages are obtained?
• The governor in a diesel engine primarily controls which of the following?
• What happens if the pressure in a boiler exceeds the safety valve's set pressure?
• The classic material for water boxes has always been:
• How does a pressure relief valve operate?
• What does a carbo-blast cleaning involve?
• Water cooled surface condensers may be classified into which flow types?
• What is defined as "flash steam"?
• What does "superheat" refer to in steam systems?
• In a mechanical-hydraulic governor system, what is the purpose of the auxiliary oil pump?
• What is a “safety interlock” system used for?
• The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the moving blades in a/an __________ turbine.
• What is primarily used to remove moisture from compressed air systems?
• Adjustable inlet diffuser vanes on centrifugal air compressors are implemented to:
• Which method is commonly used for controlling a boiler's water level?
• What role does draft play in a boiler system?
• Which type of noise in boiler systems is often associated with steam operations?
• Most aero-derivative turbines' lube oil systems require which feature?
• Which safety feature prevents a boiler from operating under low-water conditions?
• What is the primary purpose of anti-icing systems in gas turbines?
• What is the significance of a safety valve's set pressure?