2nd Class Power Engineering (2B1) Practice Exam

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• Which component provides the spark plug with a high voltage pulse in a spark ignition engine?
• What role does a jacking oil pump primarily serve in relation to bearings?
• What occurs when a flexible coupling "locks up"?
• Which way does steam flow in a turbine?
• True or False: Spark Ignition is said to be a constant volume process.
• What can be inferred if a combustion engine fails to receive initial lubrication?
• What is a common symptom of carryover in steam systems?
• What are the main components of a typical steam cycle?
• What type of lubrication system is used in large turbines, and where is the oil distributed?
• At what point does the over-speed trip mechanism activate?
• What is the major advantage of a hydraulic mechanical governor compared to a simple mechanical governor system?
• How can speed droop be improved in a mechanical governing system?
• In a turbine less than 150Kw, how are the bearings typically lubricated?
• What is the significance of monitoring pressure in steam systems?
• What is an expansion joint in piping systems?
• What can excessive scaling lead to in boiler operation?
• What is a primary cause of excessive wear in a flexible coupling?
• What is one purpose of cooling the engine?
• True or false: A disadvantage of a Backpressure governing system is that the load output is dependent on the demand for process steam.
• What is the percentage of methane in clean natural gas?
• Why are turning gear teeth set at an angle?
• How many revolutions take place in a two-stroke engine?
• Why is the condenser an important component in a steam cycle?
• When is the barring gear engaged on a hot turbine?
• What is the significance of the pH level in boiler water?
• Where are the throttle valves located in a bypass governing turbine?
• What is the operating pressure range for the Servo-ram of an Electronic-Hydraulic Governor?
• Which method is used for monitoring the efficiency of a boiler?
• What happens to steam in a condenser?
• What effect does indirect combustion have on two-stroke engines?
• What is the significance of a steam boiler's design pressure?
• Which factor can significantly affect the efficiency of a boiler?
• What does speed droop refer to?
• What effect does high turbidity in boiler water have?
• What does an equivalence ratio value less than 1 signify?
• What force causes the flyweights of a mechanical governor to move?
• What is swept volume?
• What is the typical oil filter differential pressure in kilopascals during operation?
• Which of the following is a common water treatment chemical used in boilers?
• What pressure does the pressure reducing valve decrease the oil pressure to in a turbine oil circulating system?
• Where is the mechanical overspeed trip mechanism found on a steam turbine?
• What voltage is supplied to the spark plugs of a high compression engine?
• What is engine knock?
• What is the role of chemical additives in boiler water treatment?
• What defines the minimum governor speed for a turbine?
• In terms of the equivalence ratio, what does a value greater than 1 denote?
• Why is the two-stroke engine less efficient than the four-stroke engine?
• What can excessive temperature lead to in engine lubricants?
• True or False: Blade washing is conducted at speeds no more than 25% of full speed.
• In a combustion engine, what does a rectifier do?
• What design feature of turning gear teeth helps mitigate operational noise?
• In terms of spark ignition systems, what does a distributor do?
• What is a damper and what role does it play in combustion?
• Why is monitoring oil filter differential pressure important for engine health?
• Does steam flow pass through the trip valve before going through the throttle valves in a turbine with a trip valve?
• What is the primary function of a jacking oil pump?
• What is the primary purpose of a boiler in a power plant?
• During what operational state is a separate electric lube oil pump primarily used?
• True or false: A turbine governor with high speed droop is desirable.
• What is the purpose of an air preheater in a combustion system?
• What is the other name for the thermodynamic cycle for the spark ignition engine?
• What is a blowdown in the context of a boiler?
• What is clearance volume?
• What is the primary function of a feedwater pump?
• What is the danger of low water levels in a steam boiler?
• True or False: Supercharging can increase an engine's power output by 20-40%.
• At what speed does the jacking oil pump shut down?
• What function does a "pick up sensor" serve in a spark ignition engine?
• What can result from an inadequate air supply in a boiler?
• What type of spark ignition system is typically used in low compression engines?
• Which safety device is essential for detecting water levels in a boiler?
• What occurs when high-pressure condensate is exposed to a lower pressure?
• True or false: Mechanical governing is suitable for large turbines where precise speed control is needed.
• How does compression affect the combustion process?
• What does "boiler efficiency" measure?
• What is stratified combustion?
• In relation to combustion, what does the term "draft" describe?
• True or false: The efficiency of Backpressure governing is very high because there are no steam losses.
• True or false: Flexible couplings are made from hard rubber.
• What is isochronous governing?
• What is the effect of supercharging on engine efficiency?
• What is the melting temperature of sodium hydroxide (caustic soda)?
• What is the function of a rupture diaphragm in turbine systems?
• What does a high thrust bearing temperature indicate?
• What happens to the efficiency of the engine when the cooling system fails?
• Which of the following is NOT a factor affecting combustion efficiency?
• What is the basic principle of a Rankine cycle?
• What is the purpose of insulation in piping systems?
• How is water treated to prevent corrosion in boiler systems?
• What does scavenging refer to in engine operation?
• What material is commonly used for boiler tubes?
• What is the purpose of a heater on the fuel supply line in a combustion engine?
• How does a separate electric lube oil pump support engine longevity?
• What is a typical consequence of engine knock in performance?
• What is the main effect of increasing air intake in an engine?
• What does the equivalence ratio represent?
• Does supercharging a two-stroke engine assist with scavenging?
• What does the term "heat recovery" refer to?
• What occurs if low cetane diesel fuel is used in a high-speed engine?
• What does an increased stoichiometric ratio indicate?
• Which of the following actions is best for a clean oil filter?
• Which governing method maintains a constant speed at all loads?
• How is the turbine shaft connected to a reducing gear?
• What are the purposes of engine cooling? Select the three primary purposes.
• What type of water should be used in a steam boiler for optimal performance?
• What does a value greater than 1 for the excess air ratio (Lambda) indicate?
• True or False: High-speed diesel engines are only suitable to run No.1 and No.2 distillates.
• How do "wet steam" and "dry steam" differ?
• What is the Stoichiometric ratio?
• Which of the following is NOT a typical indicator of combustion efficiency?
• What component is critical for protecting against engine wear during start-up in combustion engines?
• In a turbine equipped with an Electronic Overspeed trip system with 3 magnetic sensors, how many sensors must agree before a trip occurs?
• What is the maximum oil filter differential pressure in kilopascals?
• Which type of boiler is commonly used in power engineering?
• Which two techniques can be used to remove insoluble deposits from turbine blades?
• What is a common sign of incomplete combustion in diesel engines?
• What does the abbreviation T/T stand for in relation to steam turbines?
• What is the purpose of a steam trap in a steam system?
• What would a value less than 1 for Lambda indicate?
• Which system is primarily used in compression engines for fuel delivery?
• How is Backpressure governing controlled?
• What principle does a pressure gauge operate on?
• Which fuel source is commonly used in steam boilers?
• What does supercharging primarily increase in an engine?
• What is the inverse equivalence ratio commonly referred to?
• To what temperature will the oil coolers cool the oil?
• What does a Cetane Number refer to?
• In a four-stroke engine, what occurs immediately after the intake stroke?
• What is another name for stratified combustion?
• What is the purpose of a quick-opening valve?
• Which of the following is a potential hazard associated with operating a boiler?
• What is true regarding grid type extraction valves?
• Does altitude and ambient air temperature affect a naturally aspirated engine?
• What is the purpose of a blow-off valve in a boiler system?
• What determines the efficiency of a compression ignition engine?
• Are flexible couplings typically lubricated?
• How many throttle valves are in a bypass governing turbine?
• What is engine pre-ignition?
• What does "thermal shock" refer to?
• What is an implication of using a fuel with a low Cetane Number in high-speed engines?
• What happens to the exhaust gases when a waste gate is activated?
• What is a primary safety concern when dealing with high-pressure steam systems?
• How long is the barring gear engaged on a cold turbine?
• What does too low of an oil filter differential pressure suggest?
• What is the primary function of the condenser in a steam system?
• What happens to the turbine speed when load increases?
• What is a common cause of combustion inefficiency in boilers?
• What is the main purpose of a fuel injector in a diesel engine?
• What is the primary reason for conducting a blowdown in a boiler?
• What is the purpose of monitoring flue gas composition?
• How is "superheat" defined in relation to steam?
• Which of the following are cycles of the four-stroke engine?
• Why is the compression ignition engine more efficient than the spark ignition?
• What is the major disadvantage of a mechanical governor?
• If a turbine runs for extended periods at critical speed, what is the likely consequence?
• What is a potential risk associated with shaft misalignment in a flexible coupling?
• What is the primary purpose of a softening process in water treatment?
• What is a primary benefit of treating water in boiler systems?
• What is thermal efficiency a measure of?
• Which component primarily determines the displacement of an engine?
• What is the relationship between filter condition and differential pressure?
• True or False: Superchargers typically consist of a positive displacement compressor.
• What is the primary function of a condensate return system?
• What does the term "specific heat" refer to?
• What is the main purpose of a magneto in a high compression engine?
• What does "saturation temperature" refer to in steam engineering?
• How does the Electronic Overspeed trip system operate?
• What is the typical operating pressure range for a 2nd Class power engineer?
• What is the primary function of a turbine governor?
• What is the purpose of an auxiliary boiler?
• When is high oil filter differential pressure most likely to occur?
• How does increased ambient air temperature affect engine knock?
• What should be regularly checked to maintain combustion efficiency in boilers?
• What are the undesirable deposits commonly found on steam turbine blading?
• How does an increase in temperature affect oil viscosity?
• What is the primary function of a combustion blower in a boiler?
• True or false: Nozzle governing is only used on impulse turbines.
• True or False: Diesel engines use fuel pumps that deliver fuel to the fuel injectors.
• How does compression affect air temperature in an engine?
• What is a potential consequence of excessive differential pressure in an oil filter?
• What is the effect of a flexible coupling on system performance when it malfunctions?
• What term is used to express the amount of energy produced from burning a standard amount of fuel?
• What percentage of antifreeze is commonly recommended for use in engines?
• What is the purpose of a pressure relief valve?
• In a multi-valve turbine, what is true about the throttle valves?
• What is a common characteristic of two-stroke engines?
• What is the function of an economizer in a boiler system?
• What is the purpose of a separate electric lube oil pump in a combustion engine?
• What is the primary goal of a water treatment program in power engineering?
• What does "scaling" refer to in relation to boiler operation?
• What is the main function of a steam turbine?
• What might a consistent reading of 15-20 Kpa indicate about an oil filter?
• What is the function of the waste gate in a turbocharger?
• What is a type of non-destructive testing used for boiler inspections?
• Which condition leads to a lean mixture in engine combustion?
• In boiler operations, which pressure is typically classified as "low pressure"?
• What is the role of differential pressure in relation to an oil filter?
• In which type of turbine would you find bypass or overload governing being used?
• What system provides appropriate lubrication when a steam turbine's barring gear is engaged?
• Which of the following is a common type of steam trap?
• What maintenance consideration is crucial for flexible couplings?
• True or false: Throttle governing is used in reaction turbines.
• What is one of the primary functions of a condenser in a steam cycle?
• What type of sensor is commonly used to measure steam pressure?
• What device is used to measure speed in an Electronic-Hydraulic Governing system?
• What happens to the air-fuel mixture as engine speed increases?
• What type of governing is used in an impulse turbine?
• What does "boiler water carryover" indicate?
• What may happen to the top cylinder rings if temperatures exceed 200°C in a combustion engine?
• How many rotations does the four-stroke cycle occur over?
• In combustion engines, what role does fuel pressure play?
• What type of movement do flexible couplings permit?
• What is meant by the term "latent heat"?
• What role does a pump play in a steam cycle?
• What is the function of the steam chest?
• What characterizes the thermodynamic process in a spark ignition engine?
• What is a common characteristic of high compression engines?
• What does TDC stand for in engine terminology?