4th Class Power Engineering 4B7 Practice Exam

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• Most modern gas turbines use a ______ shaft design.
• What is the purpose of purging during a boiler shutdown?
• In a four-stroke engine, how many crankshaft revolutions are required for a complete intake, compression, power, and exhaust cycle?
• Which statement differentiates continuous and manual blowdown?
• How is a boiler safety valve typically tested to ensure proper operation?
• Which instruments and components are commonly used for drum level control, and what problems can affect them?
• Not a method to test a steam trap?
• How does fouling of heat transfer surfaces affect boiler performance?
• The injection pump of a diesel engine is driven by which component?
• Which statement is true about the two-shaft gas turbine architecture?
• What is a pressure relief device and when should it operate?
• The combustion chamber of a gas turbine:
• Which cooling method is used for large internal combustion engines?
• Which statement best describes a boiler safety device?
• What gases are typically measured in flue gas analysis and why?
• In impulse turbines, rotating blades are called Buckets.
• The hand wheel used to adjust the turbine speed on the governor is known as the:
• A two-shaft gas turbine arrangement typically involves
• How does stack height influence emissions dispersion and safety?
• Which statement correctly distinguishes psig and psia?
• How does thermal shock occur in boilers, and how can it be prevented?
• The purpose of turbine glands is to prevent:
• Which device prevents boiler operation when water level is too low?
• What is the role of refractory in a boiler furnace?
• What does P&ID stand for, and what does it primarily show in a plant for safe operation and maintenance?
• Why is boiler water pH and alkalinity control important?
• Which of these best describes signs of suboptimal combustion in a fuel-fired boiler?
• When the steam pressure drop occurs only in the stationary steam passages, the turbine is known as:
• What is the purpose of a boiler safety valve and how is it tested?
• In cooling tower operation, increasing the inlet water temperature while holding air conditions constant will
• What is burner management (flame safeguard) and why is it critical during start-up?
• Clean air flows into a gas turbine regenerator from:
• What is a steam trap and why is it essential in steam systems?
• Which treatment step most directly reduces corrosion risk in boilers?
• What is the primary purpose of a spark plug in a gasoline engine?
• The shrouding on the blades of a steam turbine primarily serves to
• On steam turbines, carbon glands are:
• Shaft sealing of small steam turbines is typically accomplished with which option?
• A simple gas turbine lacks which component?
• In cooling tower wood, when natural extractives are leached away, it becomes less able to resist what?
• Internal combustion engines used to drive gas compression machinery burning natural gas typically operate on which cycle?
• Which statement describes the startup capability of gas turbines?
• Which of the following comes earliest in the start-up sequence of a steam turbine?
• The output power of a gas turbine mainly depends upon which factor?
• What happens if condensate return is not functioning?
• Which of the following is not a type of condenser used in a steam power plant?
• A simple gas turbine is one without reheaters or regenerators.
• Natural draft cooling towers operate most effectively in large open spaces and:
• Define blowdown rate and factors that influence its value.
• Which description correctly defines forced-draft and induced-draft operation?
• Which device is used to ignite the fuel-air mixture in a gasoline engine?
• In a four-stroke gasoline engine, which stroke begins the cycle?
• What is the primary purpose of a boiler's low-water cutoff (LWCO)?
• In a gas turbine cycle, the regenerator's role is to
• What is a major difficulty encountered with a two-stroke cycle engine?
• Which term specifically excludes the latent heat of vaporization from the energy content?
• Smaller spark ignition engines vaporize gasoline by which process?
• Four-stroke cycle engine valves are
• Large four-cycle engines are usually lubricated with
• Which component supplies clean air to the regenerator?
• If boiler drum level is too high, what is the most likely risk?
• Biological attack on cooling tower wood affects the
• Why should feedwater pressure be managed in conjunction with drum level?
• What is the purpose of high-low water alarms?
• In an impulse turbine, energy transfer occurs primarily due to
• The shafts of high output, high temperature steam turbines are usually sealed using:
• What is the primary purpose of boiler blowdown?
• Which statement about steam dryness and turbine erosion is correct?
• Which lubrication method is correct for large four-cycle engines?
• The air pressure used when starting a diesel engine with injected compressed air is approximately:
• The low installation cost of a gas turbine is primarily due to which factor?
• What is the role of interlocks on the fuel and air supply in boiler operation?
• The injection pump of a diesel engine is driven by:
• What is phosphate treatment in boiler water and what is its purpose?
• Using a compressed air starting motor is a common method of starting
• The rotating passages of a reaction turbine are mounted on which component?
• An arrangement of a steam system and a gas turbine, working as a single installation, is called a
• Which device helps remove drift from a cooling tower's exhaust air?
• Which condenser type is not used in steam power plants?
• A gas turbine must be rotated at _______ speed before ignition begins.
• In a water-tube boiler, where is the water located?
• The impulse turbine works on the principle that
• Raising the air temperature entering a gas turbine compressor primarily causes the turbine's output power to do what?
• Which statement about turbine overspeed trip is accurate according to standard practice?
• A counter-flow cooling tower generally requires less floor space than a crossflow cooling tower. Which statement best describes this comparison?
• A gas turbine: Which statement best describes how output responds to intake air density?
• Which practice is essential for safe boiler room operations?
• Which of the following is NOT a common cause of boiler carryover?
• Which statement best describes the role of the camshaft?
• Which practice is part of safe boiler room operations to prevent accidental startup during maintenance?
• A turbine where the steam pressure drops only in stationary blades is called an impulse turbine.
• In impulse turbine operation, energy transfer to the blades is primarily achieved by which phenomenon?
• Which component is primarily responsible for atomizing diesel fuel before it enters the combustion chamber?
• In a reaction turbine, how does the velocity change as steam passes through moving blades?
• What is steam quality and why is dryness fraction important for turbine equipment?
• What is a true statement about a gas turbine starting device?
• In a water-tube boiler, what is the function of the steam drum and the mud drum?
• The shafts of high-output, high-temperature steam turbines are typically sealed using which method?
• What is the purpose of insulation on boiler and piping?
• Excessive wind velocity in a natural draft cooling tower may cause?
• How does drum level control maintain safe boiler operation?
• Which statement about the ignition mechanism in a diesel engine is correct?
• Which statement correctly describes a two-shaft gas turbine?
• In a four-stroke engine, which statement about valve operation is true?
• What is a recommended practice to prevent thermal shock in boilers?
• A starting device for a gas turbine
• A two-cycle gasoline engine is simpler than a four-cycle engine in construction.
• In a reaction turbine, what happens to the steam as it passes through moving blades?
• Diesel engines require:
• Which starting method is commonly used to start large stationary diesel engines?
• What is the primary function of the turbine overspeed trip?
• Starting a diesel engine with injected compressed air uses approximately which pressure?
• Which component in a gas turbine system is responsible for burning the fuel?
• In the valve train, which component lies between the valve and the pushrod?
• Economizers are used to:
• How do fire-tube boilers differ from water-tube boilers, and what is a typical application for each?
• What causes the fuel to ignite in a diesel engine?
• Cylinder scavenging is best described as
• Which of the following is a high-level step to improve boiler plant energy efficiency?
• How do safety relief valves and system piping work together to prevent overpressure?
• What is boiler carryover and what are common causes?
• During the startup sequence of a steam turbine, which action is performed first?
• What is the purpose of condensate return in a steam plant?
• In a fire-tube boiler, where are the hot combustion gases located?
• Gas turbines are ideal where:
• The purpose of a regenerator is to:
• What is the effect of silica fouling on heat transfer surfaces?
• Water is removed from the air stream leaving a cooling tower by using which device?
• What is the main purpose of interlocks between drum level control and feedwater pump operation?
• In a turbine blade assembly, shrouding influences steam flow by which of the following?
• An advantage of gas turbines over other types of prime movers, is that gas turbines:
• Which statement about drift eliminators is true?
• Differentiate continuous blowdown from manual blowdown and explain why each is used?
• Turbine lubricating oil:
• A cold weather cooling tower bypass valve should not be fully closed until the temperature reaches:
• The part of a camshaft that converts rotary motion to reciprocating motion is called
• Natural draft cooling towers are divided into which categories?
• Sealing between piston rings and the cylinder wall may be the result of which condition?
• What is the purpose of tying boiler drum level control to feedwater pump start/stop interlocks?
• In a two-shaft gas turbine, the load turbine is located relative to the compressor turbine?
• What is the primary purpose of condensate return lines in a steam system?
• In a diesel engine, an injection nozzle is used for _________.
• Outline a typical shutdown sequence for a fired boiler.
• During a single rotation of a 4-stroke cycle gasoline engine crankshaft, the engine undergoes?
• A gas turbine compressor:
• In theory, impulse turbines have which characteristic regarding pressure on moving blades?
• An essential auxiliary in a gas turbine installation is?
• One complete movement of the piston in one direction requires ____________ of the engine crankshaft:
• Rotating blades or "________" form the steam flow passages in impulse turbines.
• A two-cycle gasoline engine is characterized by which statement?
• How is diesel engine fuel delivered to the combustion chamber?
• Explain stack draft and how it is controlled in a boiler system.
• Which statement correctly describes the role of dampers in stack draft control?
• Which component is necessary for diesel engines to inject fuel into the combustion chamber?
• A gas turbine is most efficient when
• An engine that has one power stroke every two crankshaft revolutions is a:
• What are three major objectives of boiler water treatment?
• Which components are typically involved in drum level control?
• Which statement about turbine overspeed trip is correct?
• What is the primary reason for oxygen removal in feedwater treatment?
• Why is silica control important in boiler water?
• Which characteristic makes a gas turbine a favorable prime mover?
• Which shaft sealing material is commonly used in small steam turbines?
• Which step is part of a safe startup sequence for a fired boiler?
• Which statement describes the function of the flame safeguard system in a boiler?
• In gas turbine cycles, an open cycle implies
• Compression ignition engines: which statement is true?
• Gas turbine performance is influenced by air density. Which statement is correct?
• Steam turbine governors primarily
• In a reaction turbine, which component supports the rotating passages?
• How would you detect a gas leak in a boiler room and what actions would you take?
• The rate of heat transfer in any cooling tower system depends on the:
• Which statement best describes the gas turbine's suitability as a prime mover?
• Which statement best describes a boiler trip on loss of flame and a typical troubleshooting approach?
• How do you determine if condensate return lines are properly pitched?
• Diesel engine governing is accomplished by:
• What is the role of a deaerator in feedwater treatment?
• To prevent cooling tower basin water from freezing in cold weather, many units use which method?
• Gas turbines are ideal in environments where which resource is scarce?
• In impulse turbine theory, energy transfer to the blades is primarily achieved by which phenomenon?
• What measurement devices are commonly used for boiler water level indication and what failure risks exist?
• The primary function of steam turbine governors is to
• Turbines often have segmental carbon ring sealing glands that are held in place by
• What is the purpose of insulation in boiler systems?
• Which statement correctly describes how energy input and efficiency relate in a boiler?
• When starting a steam turbine it is customary practice to
• Which parameter primarily determines the output power of a gas turbine?
• What is the purpose of the mud drum in a water-tube boiler?
• What determines the saturation temperature of steam?
• What is feedwater and why must it be treated before entering a boiler?
• The hand wheel used to adjust turbine speed on the governor is called the:
• What common issue can cause drum level measurement to drift?
• How does excess air affect boiler efficiency and fuel usage?
• A closed cycle gas turbine: which statement is true?