Omaha NAPE Engineer Practice Exam

These questions are part of the practice quiz. Start practicing

• Where does the blowdown enter a blowdown tank?
• What is a characteristic of a dry sprinkler system?
• What inclination is typical for HRT boilers?
• What are pumps used for in heating systems?
• Furnace volume in a boiler is measured in which unit?
• What defines a Scotch Marine boiler?
• What characterizes alternating current (AC)?
• What is an advantage of using flexible couplings between a pump and power source?
• What characteristic describes a globe valve?
• If forced to switch from gas to oil, what initial action should you take?
• Which type of draft involves a fan at the stack that pulls air through the furnace?
• What is required to hold the temperature pressure relief valve open during testing?
• What is mechanical draft?
• What does the factor of safety compare?
• How is electric current defined?
• What is the formula to calculate the pressure at the base of a water column?
• What should the pH in hot water boilers generally be?
• What is the purpose of beading some tube ends in a water tube boiler?
• What is the typical water level in an expansion tank during operation?
• Which of the following is a requirement for chemical substance container labels?
• What is the purpose of a lantern ring in a pump?
• What is the minimum height for the lower gauge cock in an HRT boiler?
• Why is it important to vent a boiler shell?
• What is the purpose of the drain in a non-return valve?
• In the N.F.P.A hazard system, what does the color blue indicate?
• Where should the water supply be located in relation to the pump for effective priming?
• Which of the following characteristics is essential for safety valves?
• When connecting an ohmmeter, what must be ensured?
• How is boiler horsepower defined in terms of evaporation?
• What should you order if your fuel oil tank has 10,000 gallons remaining and the tank capacity is 20,000 gallons?
• What is the factor of safety for newly constructed boilers?
• What is classified as a Type A fire?
• What is a modulating control in a boiler context?
• What defines the factor of safety for flywheels?
• What is the function of a Hartford loop in a boiler system?
• What is the primary function of an alternator?
• What minimizes hardships to furnace walls in boiler design?
• What is a characteristic of a diagonal stay?
• Which method is considered best for supporting an HRT boiler?
• What defines a diverted fitting?
• What is required around the fill opening of fuel tanks for spill protection?
• What is a common cause of a false level reading in a sight glass?
• In a 240 volt circuit with a 20 amp load, what characterizes the resistance?
• What is the heat content of one pound of carbon?
• Which type of pump is a metering pump categorized as?
• What distinguishes a rising stem valve from a non-rising stem valve?
• What is water hammer in a boiler system?
• What is necessary for secondary air to create turbulence around the fuel?
• Volts can be defined as which of the following?
• What is the purpose of a crown sheet in a vertical fire tube boiler?
• How is the operational state of a centrifugal pump verified?
• Why is oil used in transformers?
• Which two types of soot blowers are mentioned?
• What are pits and how are they caused?
• What is defined as incomplete combustion?
• What action should be taken if a boiler feed water pump becomes steam bound?
• What happens if the condensate isn't drained from the soot blower steam supply before use?
• What can happen if a boiler shell is not vented and drained properly?
• What advantage does a closed feed-water heater provide over an open feed-water heater?
• What is a through stay in the context of boiler construction?
• How can dampers on a large fan be controlled from a remote location?
• Why is a check valve installed after a pump?
• What is the advised temperature for heating #4 oil before usage?
• What seals are used when operating a pump under 200 degrees Fahrenheit?
• Which of the following is NOT a type of alloy?
• Should a centrifugal pump be primed with it running or off?
• What device is commonly installed upstream of a steam trap to prevent contaminants from interfering with its operation?
• If you exceed the 90% fill limit for a fuel oil tank, what system is at risk?
• What distinguishes a tube sheet in a boiler?
• What type of packing is commonly used in centrifugal pumps?
• What is primary air?
• What is the primary role of the Environmental Protection Agency (EPA)?
• What does power factor represent?
• What is the recommended slope direction for a steam line?
• What happens when steam is allowed to continuously leak from a steam trap?
• What are tube ligaments?
• What are Tuyeres also known as?
• What is the primary function of an oil separator?
• What occurs if the discharge valve is closed on a rotary pump?
• What is an alloy?
• What component connects the bourdon tube to the pointer?
• Which of the following is an example of post purge?
• What is a check valve's primary function?
• What is regarded as a good percentage for thermal efficiency in boilers?
• What is one reason for losing your license as an engineer?
• What is the primary purpose of a fyrite analyzer?
• Which two factors influence the effectiveness of a stack's draft?
• What is the smallest allowed pipe size for a water column?
• What is scale in a boiler and what causes it?
• Approximately how much area does a single sprinkler head cover?
• What should be done when the bourdon tube experiences increased pressure?
• What is the main function of a superheater?
• How can overfill protection be ensured in a fuel oil tank?
• Which type of pump is described as steam-driven and double-acting?
• What minimum size is specified for a manhole opening in a boiler?
• If an electrical panel caught fire in your boiler room, what should be your first two actions?
• In a lap joint, how are the two plates arranged?
• Which component is NOT part of the oil supply line setup?
• What does lockout/tagout aim to do?
• What are the three states of matter?
• Which statement correctly describes a volute centrifugal pump?
• Which of the following can be used to clean boiler tubes besides mechanical means?
• What is the latent heat of steam per pound?
• What is a disadvantage of an open feed-water heater?
• What are the advantages of mechanical seals over packing in centrifugal pumps?
• How should a steam gauge be properly mounted to a boiler?
• What occurs to current if the resistance increases while voltage remains constant?
• What is the purpose of fuses and circuit breakers in generators?
• How many watts are in one kilowatt?
• How does a safety valve operate?
• What is the proper procedure for mechanically cleaning the water side of boiler tubes?
• According to Ohm's Law, how is current related to resistance and voltage?
• What is the circulation pattern of water within a Sterling boiler?
• What is a 'bag' in the context of boiler tubes?
• When experiencing difficulties with an oil fired plant, which two issues should be investigated first?
• Which type of pump is NOT mentioned as a type used in heating systems?
• How is the density of smoke measured?
• Why is the suction opening on a pump larger than the discharge opening?
• Which type of superheater uses direct radiation from the furnace?
• What should be done before removing a manhole cover?
• What does Net Positive Suction Head (N.P.S.H.) refer to?
• What action should you take if your boiler is foaming to ascertain the water level?
• If the sight glass breaks while the boiler is operating, what should you NOT do?
• What does the theory of electricity primarily involve?
• Which of the following types of boilers is a package boiler?
• What should the observer's distance be when using a Ringleman chart?
• What safety precaution should be taken during the evaporation method test?
• What is actual lift when referring to pumps?
• What type of draft occurs when the boiler operates slightly below atmospheric pressure?
• What causes foaming in a boiler, and how is it typically reduced?
• Which of the following does NOT apply to PPE requirements?
• What is the first step in putting a cold boiler on line with other operating boilers?
• When removing refrigerant from a system, what is the appropriate action regarding its usage?
• What is one advantage of rotary pumps compared to other pump types?
• What type of valves are permitted between the boiler and the water column?
• What is the result of a blister in boiler steel?
• What happens when a centrifugal pump's impeller rotates?
• How is latent heat defined?
• When comparing wires, which has more resistance, #12 or #14 gauge wire?
• Which valve is used to control water levels in a boiler?
• What type of draft system mixes both forced and induced draft?
• What is a primary reason for not connecting blowdown directly to the sewer?
• What type of securing method is used for tubes in a water tube boiler?
• For which type of fittings is cast iron prohibited when dealing with superheated steam?
• Where are turbulators used and what is their primary function?
• Why are relief valves important in rotary pump systems?
• How is the flow of natural draft controlled in a boiler system?
• What is one way to prevent standing condensate in steam lines?
• Which valves are used in the correct sequence on a feed-water line?
• What impacts the total pressure on a boiler's shell?
• What are the key factors to consider when selecting lubricants for use in a plant?
• Which fittings are recommended for cleaning and inspection of a water column?
• What is the formula for the cross-section of a 1-inch bolt?
• What is the first step to take after a hazardous materials spill?
• Why is it important to perform rounds throughout your work area?
• Where is the dry pipe located in a boiler?
• What are some key benefits of using a centrifugal pump?
• How are impurities generally removed from HRT boilers?
• What is the maximum allowable blow down for a safety valve?
• What is the recommended frequency for performing a hydrostatic test on new boilers?
• How many positions can a soot blower's revolving arm take during operation?
• How should a water column be piped on an HRT boiler?
• What role does the bypass serve in a centrifugal pump system?
• What type of steam contains droplets of water that have not yet evaporated?
• How is fuel oil heated before use?
• What might be a consequence of not addressing oil contamination in a boiler?
• What grade of smoke is permitted in Omaha's boiler operation?
• How often should the temperature pressure relief valve be tested in a hot water heating system?
• What is the primary purpose of a preheater?
• Which statement best describes an insulator?
• What function does an aqua-stat serve in a heating system?
• Which boiler will withstand the greatest working pressure based on diameter alone?
• What is a primary benefit of a feed-water heater?
• In a situation of extreme cold and no water showing in the gauge glass, what is the appropriate action?
• What is required on a Right to Know (RTK) label?
• What is a key component in preventing the escape of the liquid being pumped?
• What defines perfect combustion?
• Which of the following practices can help to overcome vibration in piping systems?
• What type of joint is considered the weakest part of a boiler?
• How often should low water cutoffs be tested to ensure safe operation?
• What is a prepurge?
• What percentage of fuel oil tank capacity can you fill without risking overfill?
• Which property of oil is important for resisting extreme pressures?
• Where is a pyrometer typically located on a boiler?
• What is one disadvantage of rotary pumps?
• Ammeter is connected in what manner in a circuit?
• What type of energy does an electric motor convert?
• What is a butt joint?
• In a forced draft system, where is the fan located?
• What does BTU stand for and what does it measure?
• Which is a benefit of direct current (DC)?
• What is a common chemical test done on boiler water?
• Which type of pipe can be used for superheated steam?
• What is the pressure and temperature limitation for standard fittings in steam pipes?
• What is the primary purpose of a transformer?
• What are two methods recommended for managing expansion in steam lines?
• How does an injector function within a steam system?
• What should be considered when selecting a motor?
• What should be done before starting combustion in a boiler?
• What are the types of hot water heating systems?
• What does OSHA stand for?
• What characterizes a slow opening valve?
• What is the effect of excess secondary air in a boiler?
• To whom does recovered refrigerant belong?
• How can pulsation in a gas furnace be corrected?
• What device is used to ensure that a pump is running in a hot water system?
• What does PSIG stand for?
• How is draft typically measured in heating systems?
• What type of power plants is most commonly used to generate electricity?
• What records does the EPA require to be kept regarding underground fuel tanks?
• Why must a pump be primed before it operates?
• What is one of the required overfill preventions for a fuel oil tank?
• What device can be connected to a water column?
• What information is typically stamped on a boiler according to ASME standards?
• How are the tubes secured in a firetube boiler?
• What is the minimum size piping recommended for a blowdown line?
• At what pressure is the use of cast iron permitted?
• Which of the following is NOT considered a heat loss in a boiler?
• What is a longitudinal joint?
• Is an automatic shutoff valve allowed between the boiler and the water column?
• What should the pH level be in a steam boiler?
• Which key document must be obtained to handle refrigerants legally?
• What happens to saturated steam when heat is added?
• What is the ASME code requirement if a boiler has only one low water cutoff?
• What is the maximum temperature to which oil should be heated relative to its flash point?
• What does the ignition point refer to?
• What is the definition of combustion?
• If a safety valve lifts at 100 psi, what is the expected closing pressure?
• What condition indicates the necessity for using forced draft?
• Which appliance is used to warn of low water levels in a boiler?
• When piping a continuous blowdown, what is the purpose of using a heat exchanger or flash tank?
• What is the primary purpose of an exhaust steam separator?
• What is one chemical used to prevent scale in a boiler?
• What do the letters "O" and "S" on an Ashton type safety valve indicate?
• What percentage of oxygen is found in air by volume?
• What conditions could lead to sediment accumulation affecting sight glass readings?
• Which two types of motors are examples of electric motors?
• How can you verify if a water gauge glass is properly set on a firetube boiler?
• How is a Sterling boiler suspended?
• Which factor is essential for determining the rate of combustion?
• What describes a sectional boiler?
• What must be done to avoid chattering in safety valves?
• What precaution is essential before lighting a gas, oil, or pulverized coal fire?
• What occurs if the expansion tank's sight glass is full and system pressure is high?
• What defines a confined space?
• What best describes a steam boiler?
• What is the general spacing for sprinkler heads?
• What is the purpose of an economizer in a boiler system?
• What component typically determines how a gate valve is used?
• What is considered a good percentage of CO2 in flue gas analysis?
• What is superheated steam?
• What is the function of a surface blow off in a boiler?
• Your fuel oil tank capacity is 20,000 gallons and you have 10,000 gallons remaining. How many gallons will you order to remain within safe levels?
• Why are hot water systems preferred over steam systems for heating buildings?
• Which type of refrigerant handling must conform to EPA regulations?
• What role does excess air play in combustion?
• Why are hollow through bolts used in a water leg?
• Which of the following is NOT a method for treating boiler water externally?
• What is a continuous blow down system designed to do?
• What can be used to keep a boiler online if the gas meter malfunctions?
• What is a key difference between a gravity return system and a vacuum return system?
• What does the impeller of a centrifugal pump do?
• What is one method used for aligning a pump with a motor?
• What is one characteristic of a good motor?
• Which of the following is a key requirement of a good boiler?
• What is a fundamental characteristic of rotary pumps?
• What is the purpose of using a manometer in a boiler system?
• What is the theoretical lift capability of a pump?
• An internally fired boiler has which of the following characteristics?
• Why is it essential to brace or stay a flat surface in a boiler?
• What is the primary function of a low water alarm?
• How is radiant heat transferred in a boiler operation?
• What is the flash point of a substance?
• What is a key feature of a diaphragm, piston, or plunger operated metering pump?
• Which method is used to analyze the combustion efficiency in a boiler?
• What is the function of a water leg on a boiler?
• What is the difference between a fire crack and a tension crack?
• How can flame impingement be prevented in a boiler?
• How often should extinguishers be inspected?
• Where does the bottom blowdown pipe connect in an HRT boiler?
• What are the common methods used to patch boiler drums and shells?
• What test should be done after mechanically cleaning boiler tubes?
• What are the three types of feed-water regulator systems?
• What does caustic embrittlement indicate regarding boiler steel?
• How is a flue defined in relation to a tube?
• What observable indicator suggests that soot blowing has been effective?
• What type of stays are commonly used in Wetback (Scotch marine) type boilers?
• What does an oil supply line connect from the tank to?
• Which term describes the ratio of heat absorbed by water to the heat provided by fuel?
• What may cause soft packing to leak in a centrifugal pump?
• What is the primary purpose of an air chamber in a reciprocating pump?
• What does SDS stand for?
• What is the function of a siphon tube in a boiler?
• What causes natural draft to occur in a furnace?
• What does ASME stand for?
• What is a significant disadvantage of a one pipe steam system?
• What is the consequence of improperly handling refrigerant?
• How should you prepare a boiler before a hydrostatic test?
• What characterizes a water tube boiler?
• What is a potential change that must be made to a boiler’s valves and fittings when using superheated steam?
• How can leaks in the shell be detected in a negative pressure furnace?
• If you change your job, what is required of you?
• Who is authorized to adjust the blow down of a safety valve?
• How often should safety valves be tested manually?
• Where is a gate valve most commonly used?
• Which process describes how a generator functions?
• What certification is required for someone to handle refrigerant?
• What component is included in a gun type burner assembly?
• Why are steam lines larger than condensate lines?
• What is a key characteristic of lost motion in a duplex pump?
• Why is a pressurized furnace generally not recommended for large boilers?
• What is the purpose of safety valves in relation to a superheater?
• What is the effect of a non-return valve when putting a second boiler online?
• Which test method can be used to assess steam trap operation?
• What is the main use of metering pumps in power plants?
• Where should the steam gauge be connected to the boiler?
• What is defined as the rate at which work is done?
• What is one function of a vacuum return pump in a condensate system?
• When purging ensures safe operations, what happens if not carried out?
• Which type of boiler is categorized as externally fired?
• Which type of boiler is noted for its low initial cost?
• What is the primary function of a double balanced feed water valve?
• What is priming in a boiler, and how can it be reduced?
• How should a safety valve be connected to the boiler?
• Which of the following is an advantage of water tube boilers?
• What must recovered refrigerant be stored in?
• What happens when the foot valve is not tight in a pump?
• Why might a boiler not require a feed pump?
• What are the two types of fusible plugs?
• Where is an expansion tank typically located in a hot water system?
• What can be used to save fuel and energy in piping systems?
• What is 'single phasing' in a motor?
• What are the four major areas included in a fire safety floor plan?
• What does purging refer to in boiler operations?
• Where might a pressure reducing valve (PRV) be commonly used?
• What issue should be monitored when paralleling two centrifugal pumps?
• How can you reverse the rotation of a single-phase motor?
• Which of the following is an example of a conductor?
• What type of joint is a circumferential joint?
• If a boiler designed for 125 psi is now operating at 15 psi, what must be done regarding the safety valve?
• Which of the following is a vital safety device on a boiler?
• What is the function of a water back in a stoker?
• What is the significance of a transformer in relation to AC?
• What unit is used to measure electrical power?
• What method should be used when replacing broken sight glass?
• Which characteristic of oil is crucial for maintaining lubrication under high temperatures?
• Convert 122 degrees F to Celsius using the provided equation. What is the result?
• What is the most important item to check during a boiler inspection?
• Which type of extinguisher would be suitable for an electrical fire?
• Which method of heat transfer involves physical contact?
• Why is it important to have a seam above the fire line in the boiler?
• What is the primary function of a foot valve in a pump system?
• In which location is an inverted bucket trap primarily used?
• What type of motor is a synchronous motor compared to?
• What is the primary function of a plug valve?
• What is the heat content of one pound of a good coal?
• How long should a bottom blowdown last?
• What is defined as the ability to do work?
• In a boiler system, what must be installed for maintenance of the oil supply line?
• Why is a row of tubes sometimes left out of an HRT boiler?
• Which method is NOT used to determine the depth of a pit?
• Which of the following is NOT a requirement for handling refrigerant?
• What is a recommended action for a pump if there are signs of overheating?
• What is the primary use of a soot blower?
• What happens if the allowable percentage for tank fill is exceeded?
• How can the flow rate of a centrifugal pump be adjusted?
• Which type of safety valve can expel steam without allowing the pressure to rise excessively?
• What is one of the safety devices found on a hot water boiler?
• What is a primary disadvantage of fire tube boilers?
• What can lead to the necessity of draining an expansion tank?
• What is described as pulsation in combustion systems?
• What is the primary function of a combustion chamber in a boiler?
• What crucial role does the thermostatic element in a float and thermostatic trap play?
• What is one source of air that aids in atomization in an oil burner?
• What measurement corresponds to one ampere in terms of electricity?
• What is required for a boiler to be efficient and responsive to demands?
• What does SWP stand for in relation to valves?
• Which joint type is the strongest in a boiler?
• Which of the following is NOT a type of stay used in boilers?
• Which is a NOT a reason for the use of crosses and tees in piping?
• How should ball bearing motors be lubricated?
• What happens to equipment when a steam trap is stuck closed?
• Which of the following is NOT a type of fire protection system?
• Which types of nozzles are used in oil burners?
• What type of heat transfer could occur in a water heater?
• When is it recommended to blow down the sight glass?
• When is the recommended time to conduct a bottom blowdown of a boiler?
• How much oil can you spill before you must call the EPA?
• What does an orsat apparatus measure?
• What is the primary safety procedure to observe while performing a bottom blowdown?
• What happens to steam as it enters the dry pipe?
• What can you limit your suction lift to when using cold water?
• What test is used to assess a boiler's safety valve capacity?
• How often should steam traps ideally be tested for proper operation?
• What is a water wall in a boiler?
• Which best describes a non-return valve?
• What type of valves is typically used for bottom blowdown?
• What is done to facilitate tube removal on water tube boilers?
• In relation to a closed feedwater heater, where should the feedwater pump be located?
• Which condition leads to corrosion in boiler systems?
• Which part is NOT typically found in a double suction centrifugal pump?
• What does a cyclone steam separator do with water and solids?
• Why is it important to use properly marked cylinders for refrigerant storage?
• Which type of stays are used in the heads of water tube boilers?
• What is the unit of measurement for resistance?
• What are the three T's of combustion?
• What is the purpose of secondary air in combustion?
• What qualities should good lubricating oil possess related to temperature?
• Which device is used to measure voltage values?
• Which of the following is NOT a valve found on a boiler?
• When installing a 100-foot steam line, where should the anchoring be placed?
• How should a manual soot blower be operated for effective use?
• Which type of steam trap utilizes a floating mechanism that opens the valve as the level of condensate rises?
• Which of the following is NOT a safety item to be aware of in a power plant?
• How is a fire crack described, and is it dangerous?
• What is the purpose of a high fire limit control on a boiler?
• Where are the ASME code markings usually found on a fire tube boiler?
• What pressure range should a steam gauge for a boiler have?
• How often is a boiler supposed to be inspected?
• What distinguishes a closed feed-water heater from an open one?
• What type of protection should be worn at all times in a power plant?
• What is the weight of 1 cubic foot of water at 62 degrees F?
• What component can be adjusted to regulate the blow down of a safety valve?
• What should be inspected if a boiler's stack temperature is higher than normal after maintenance?
• At what temperature should a safety valve on a superheater be protected with heat resisting materials?
• What should be done if oil is found in a boiler?
• What does a bourdon tube consist of?
• How many safety valves are required on a boiler with more than 500 square feet of heating surface?
• What is the purpose of a hydrostatic test on a boiler?
• What is considered the most important valve on a boiler?
• Which of the following describes superheated steam?
• What does electromotive force refer to?
• What distinguishes a piston from a plunger in pump operation?