Marine Engineering Practice Exam

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• Which heat source is used for regenerative feedwater heating in marine systems?
• Butterfly valves are best used on:
• The presence of water in a body increases its electrical conductivity.
• In an air starting system, which function is performed by the control panel?
• Bearing clearance is checked during overhaul of crankshaft main bearings using which tool?
• As pressure increases, the boiling point of a liquid in equilibrium with its vapor
• In general, tubing is smaller and more flexible than pipe.
• Which statement is true regarding pipe fittings?
• If you are not sure whether a victim is in contact with an energized circuit, what should you do?
• Which energy form is described as a fluid under pressure?
• In a basic electrical circuit, which trio correctly identifies the essential components?
• What is the primary purpose of a condenser in a steam propulsion plant?
• For a hose with designation -8, which of the following is the correct inside diameter in inches?
• Inspection of piping normally involves which of the following?
• Prior to utilizing electrical equipment, which action is recommended?
• Rubber-soled boots prevent exposure to electricity.
• Which component is primarily responsible for interrupting current when leakage is detected?
• Lockout/Tagout procedures must be performed by:
• Which option is NOT one of the three common methods to connect tubing?
• Three ways to connect tubing are:
• A current as low as ______ can be felt by the body.
• What is the purpose of a stern tube bearing and what are the consequences of misalignment?
• In a turbocharged diesel engine, the exhaust system primarily serves to:
• In a main propulsion steam turbine installation, the condensate pump initially discharges to the
• When installing hoses, is it OK to bend the hose tighter than the recommended bend radius?
• Which of the following sequences correctly lists the safety controls typically installed on fuel lines?
• What is a Ground Fault Circuit Interrupter?
• During a sea trial, which parameter is used to assess throttle response?
• Which factor is included as a main consideration when choosing between two-stroke and four-stroke engines and affects lifecycle cost?
• A disadvantage of a threaded fitting is that they are prone to leaks.
• Which statement correctly defines flash point?
• List the main components of a typical air starting system for large marine engines.
• In hose designations, which value is used to indicate the inside diameter?
• In lubrication system filtration, which statement correctly distinguishes a purifier from a filter?
• In a marine fuel oil system, what is the role of a purifier?
• Which description describes pneumatic energy?
• Which item is explicitly listed as a monitored parameter in engine room automation systems?
• Which statement about pipe fittings is true?
• What is the typical starting sequence for a large two-stroke marine diesel engine?
• Natural circulation in a marine boiler is a result of
• Exhaust Gas Recirculation (EGR) in marine engines is intended to
• Define flash point and pour point in fuel oils and why they matter.
• During a sea trial to evaluate propulsion plant performance, which items are essential to record?
• In an air starting system, which statement best describes the function of the control elements that sequence starting operations?
• In a D-type steam boiler, downcomers are used to transfer water from the water drum to the steam drum.
• How does a ship's main engine governor regulate engine speed?
• Which option correctly identifies a factor to consider when selecting hose assemblies?
• In a two-stroke diesel engine, which component is typically absent from the cylinder assembly?
• Piping is sized:
• What safety devices are typically installed on fuel lines to prevent fire risk?
• Which of the following are electrical hazards?
• What is a boiler economizer and what benefit does it provide?
• In low-pressure systems, unions provide easy disassembly.
• What is potential energy?
• Exhaust Gas Recirculation (EGR) in marine engines is primarily intended to
• In an impulse turbine, the fixed blades function to
• Turbine blade erosion is accelerated by
• The -8 hose's ID is 1/2 inch. Which option confirms that information?
• The energy required to raise 1 lb of water by 1 degree Fahrenheit is called
• When the ground prong is separated from the equipment plug, which of the following is the correct action?
• If you need to use a ladder while working near electrical parts, you should:
• The lube oil system's primary role includes delivering oil to moving parts to reduce friction and to assist in keeping the parts cool. Which statement best reflects this?
• A ball valve can be used to regulate or throttle flow.
• Pipe fittings are flanged, threaded or welded.
• Which statement describes the proper requirement for workers who repair electrical devices?
• Which of the following is NOT a characteristic to consider when selecting hose assemblies?
• In a diesel engine closed cooling system, the expansion tank is designed to allow expansion of water volume as temperature rises.
• If a steam powered ship has a cold plant, boilers and turbines take several hours to properly warm up before the ship is ready to leave port.
• Pour point is defined as the lowest temperature at which oil will pour. Which option correctly states this?
• Which statement is not correct?
• What is the function of a steam condenser in steam propulsion plants?
• Net Positive Suction Head (NPSH) is critical for lubricating and feed pumps because what?
• What is regenerative feedwater heating and how does it improve boiler efficiency?
• During the starting sequence of a large two-stroke engine, what initiates crank rotation?
• Why is proper propeller shaft alignment essential for the life of the mechanical seals?
• According to OSHA, voltage above which level is considered high voltage?
• What is the purpose of an air ejector in shipboard systems?
• Which of the following is NOT a factor in selecting hose assemblies?
• Which description best defines hydraulic energy?
• Which factor is inversely related to the amount of harm in an electrical exposure?
• In exhaust gas cleaning systems on ships, what is the role of a venturi scrubber?
• The statement 'A person usually offers the most resistance to electricity' is:
• Which of the following sets of parameters is typically monitored by an engine room automation system?
• Which statement best describes lockout requirements during normal operating procedures?
• Lockout is a technique used to:
• When inspecting hoses, you should also look for:
• Turbine blade erosion is accelerated by high moisture content in steam.
• Which statement regarding extension cords is correct?
• What is a sea chest, and what is its role in the ship's cooling system?
• Which step is the first in the LO/TO six-step process?
• The main advantage of a duplex filter unit is that:
• Explain the principle and function of a centrifugal purifier in fuel oil service.
• Valves are classified by all of the following except:
• What is propeller slip?
• Electric shock can cause which of the following?
• Which sequence best describes how an emergency shutdown (ESD) system functions in a propulsion plant when a fault is detected?
• What does LO/TO stand for in safety terminology?
• The intercooler in a turbocharged engine is intended to:
• For a continuous-operation diesel engine, a duplex filter unit is preferred because:
• Which statement concerning flexible hoses is false?
• In an impulse turbine nozzle, the rotor experiences energy transfer primarily through which mechanism?
• What should you do if a portable power tool is damaged, hot, or sparking?
• In a D-type boiler, downcomers connect the steam drum to the water drum.
• If you need to control the direction of flow (prevent flow from going in the wrong direction), you should use a:
• The -8 designation on a hose refers to its inside diameter of which value?
• What is the purpose of an air receiver in the ship's compressed air system?
• If the net heat rate increases, what happens to overall propulsion efficiency?
• Pigging in fuel and ballast piping is used to push a pig device through pipes to clean and inspect for blockages or to separate product batches.
• Describe the function of a condensate drain and feedwater control in a steam cycle.
• What does feedwater control regulate in the boiler system?
• The purpose of an intercooler (charge air cooler) is to cool the high pressure, high temperature air coming out of the turbocharger to make the air more dense, increasing engine power when mixed with the proper amount of fuel.
• Which practices mitigate fuel oil contamination in storage tanks?
• Which energy form corresponds to air under pressure?
• The energy required to raise water by 1°F is called 1 Btu.
• Which of the following best defines net heat rate in a propulsion plant?
• Compare high-pressure and low-pressure marine boilers in terms of typical applications and characteristics.
• The maximum lube system operating pressure for a diesel engine is normally regulated by which component?
• What is the effect of increasing body resistance on the harm caused by an electrical exposure?
• Which characteristic should be considered when selecting hose assemblies?
• Which statement about hose selection is accurate?
• Which statement about ball valves is correct?
• What is the purpose of inert gas blanketing in fuel storage?
• Unions are a common threaded connection used in low pressure applications.
• Tubing is sized based upon the inner diameter, unlike piping.
• Which part of the human body offers the most resistance to electricity?
• Which statement best describes the flow characteristics of positive-displacement pumps compared with centrifugal pumps in marine propulsion systems?
• Bleed air in a marine gas turbine serves which roles?
• Which of the following is NOT listed as a common cause of cavitation in boiler feedwater pumps?
• True or False: Even if there are cracks in insulation, you are still protected from an electric shock.
• What is the primary purpose of shut-off valves in propulsion and fuel lines?
• The greater the body's resistance to electricity, the ______ amount of harm to the person.
• If tags are the only form of protection used, what is required?
• Outline the main components and flow path of a typical marine lubrication system.
• Which statement about globe valves is true?
• Which environmental factor is important when selecting hose assemblies?
• Which component uses exhaust gases to preheat feedwater in a boiler system?
• In a Rateau turbine, what happens to pressure and velocity through the nozzle?
• Higher propeller slip generally leads to what outcome for a vessel's thrust and efficiency?
• A hose designated -8 has an inside diameter of which value in inches?
• Which condition yields the highest resistance to electricity?
• Which classification is commonly used to specify piping dimensions?
• What piping component is a short length of pipe with threads on both ends used to join two female-threaded fittings?
• A general principle in inspection is to check for corrosion, leaks, and proper support.
• How is closed-loop cooling maintained with glycol-water mixtures in terms of quality control?
• Heat exchangers are most commonly found in which part of a diesel engine?
• Which of the following is a main component of an air-start system on a large marine engine?
• In the context of stern tube bearing misalignment, which is a likely consequence?
• Which statement best defines kinetic energy?
• What is the function of a sludge trap in fuel oil filtration systems?
• In hydraulic systems, pressurized liquids and gases are typically conveyed through which component category?
• Which of the following is NOT a main consideration when choosing between two-stroke and four-stroke marine engines?
• What is the advantage of a counterflow arrangement in heat exchangers?
• Fuel is admitted to a diesel engine cylinder through the:
• Which of the following statements is true about tubing connections?
• What is the primary function of an intercooler in a marine turbocharged diesel engine?
• Using a boiler economizer primarily increases which aspect of boiler performance?
• A cracked insulation on a device means:
• Which component would NOT be found in the cylinder assembly of a typical two-stroke diesel engine?
• Which statement lists the main components of a typical air starting system for large marine engines?
• What is white metal bearing material and where is it used in marine engines?
• Special training is required on the use of tags if tags are the only form of protection used.
• Inspection of tubing involves which of the following?
• Handling electrical devices during repairs requires:
• A flexible cord should be inspected for the following defects prior to use.
• Which factor related to installation affects hose performance and should be considered?
• What is the function of the steam drum in a water-tube boiler?
• In a diesel engine closed cooling system, what is the primary function of the expansion tank?
• Which statement best defines open-loop versus closed-loop speed control in a marine engine's governing system?
• Which of the following is the fourth step in the LO/TO six-step process?
• Which of the following valves is best suited to regulate or 'throttle' flow?
• Which practice contributes to preventing fuel oil contamination in storage beyond filtration?
• Which inhibitor type is used as an oxygen scavenger in boiler water treatment?
• Where is the boiler economizer typically located and what is its function?
• How do you relate engine indicated horsepower (IHP) to brake horsepower (BHP) for a marine engine?
• A diesel engine with a fresh water cooling system may use a radiator or keel cooler to:
• What is the primary purpose of a boiler safety valve?
• The proper stance on hose bending is that you should not bend tighter than the recommended bend radius; which statement reflects this?
• Regarding the color of hose as a characteristic, which statement is true?
• Which statement is correct about responding to a victim in contact with an energized circuit?
• True or False: Because the human body is composed of water, chemicals, and minerals, a person is an excellent conductor of electricity.
• In marine gas turbine operation, what is the purpose of inlet air cooling and bleed air?
• The nozzle assembly in an impulse turbine performs which function?
• What happens to heavier water and sludge in a centrifugal purifier used for fuel oil service?
• Name tell-tale signs of fouling in an economizer or heat exchanger.
• Which statement best describes the difference between open-loop sea-water cooling and closed-loop fresh-water cooling in marine engines?
• Valve packing is held in place between the stem, gland and bonnet by the packing nut.
• What action should you take regarding a damaged portable power tool?
• The purpose of lockout/tagout is to:
• The lube oil system of a diesel engine delivers oil to the moving parts to reduce friction and to assist in keeping the parts cool.
• In a D-type boiler, the downcomers connect which two components?
• In the lubrication system, which component removes heat from the oil before it circulates to bearings and gears?
• When you encounter a tag or lock on a switch, what does it indicate about the equipment?