QMED Sea School Practice Test

These questions are part of the practice quiz. Start practicing

• Why are safety glasses required when handling R12 refrigerant?
• At what pressure do closed cooling systems typically operate?
• What can occur if an injector becomes clogged?
• Where is the steam drum located in a boiler?
• What characteristic is unique to a positive displacement pump?
• What is the primary role of moisture separators in steam systems?
• Which of the following is NOT one of the four strokes in a four-stroke cycle?
• After steam leaves the superheater, where does it go?
• Where is the rudder angle indicator typically located?
• What is the purpose of the water drum in a boiler?
• The connecting rod is considered to be what type of part in an engine?
• What is the main concern associated with a chemical reaction that causes corrosion in water tubes?
• Which of the following components can be supported by friction bearings in diesel engines?
• In what kind of situations is the use of diesel fuel crucial?
• What condition could lead to shorts or ground issues in an electrical motor?
• What is a common cause of excessive lube oil consumption in engines?
• A broken intake valve typically causes what issue?
• What is one of the main goals when cooling in an air conditioning system?
• Electrical fires are categorized under which class?
• What happens to the boiling point of coolant in a closed cooling system?
• What are the necessary characteristics of a good lubricant oil?
• In the event of losing feed water pressure, which valve will automatically close?
• When might a refrigeration ton be particularly relevant?
• What does the piston stroke refer to?
• What occurs immediately after the ignition and combustion of charge in a diesel engine cycle?
• Why is dirt in grease considered detrimental?
• Which safety protocol is enhanced by the Global Maritime Distress Safety Service?
• What results from excess temperature in engine exhaust gases?
• The suction pressure control switch is responsible for what action in a refrigeration plant?
• What is the term for the bottom sheet in the steam drum?
• What component is essential for the combustion process in a diesel engine?
• What do proper functioning grooves and lands prevent in an engine?
• What type of boilers are all propulsion boilers on modern ships?
• Which mechanism serves to close the valves in an engine?
• What is the upper sheet in the boiler tube referred to as?
• What is the purpose of an aftercooler in a compressor system?
• What role does the jerk pump serve in a fuel injection system?
• What are auxiliary boilers classified as?
• What characteristic is crucial for the performance of poppet valves in engines?
• During which phase is the fuel injected into a diesel engine?
• What type of motion does the connecting rod journal in an engine have?
• According to Charles' Law, what relationship exists between gas volume and absolute temperature?
• What demographic primarily uses survival crafts?
• Where are downcomers typically located?
• How many degrees of crankshaft rotation does one stroke represent?
• What is commonly used to monitor boiler pressure?
• What is essential for proper combustion in a boiler system?
• At what temperature does the flash point of an oil occur?
• What is plastigauge used for?
• What is a critical first step for starting a diesel engine?
• How is one throw defined in terms of crankshaft components?
• What causes corrosion deposits on the sides of water tubes?
• What is the main purpose of the stroke measurement in an engine?
• Which valve type is typically used for regulating flow?
• What is primarily preheated by an economizer?
• Which types of bearings are considered basic engine bearings?
• What defines sensible heat in counseling activities?
• What characteristic of soot makes it a concern in machinery?
• What defines a product as a pipe?
• What effect does running clearance have on lubrication?
• How are freon bottles classified or identified?
• What is a common cause of damage to gears in mechanical systems?
• What is a primary function of the evaporator in a refrigeration system?
• What does spark ignition require to ignite fuel?
• What do wear rings eliminate the need for?
• How many furnaces do D type boilers have?
• Before opening the inspection cover of an engine, what is the necessary condition?
• What does the heating element in an idle air compressor do?
• What role do certain ratios of air, fuel, and heat play in engine operation?
• Which statement best describes the function of electric motors?
• What type of materials are typically used in most line shaft bearings?
• What is the purpose of a dehydrator in a refrigeration system?
• What is the basic principle of air conditioning?
• What happens to oil when it reaches its fire point?
• Which of the following types of valves is not classified as manual?
• How is torque commonly measured in mechanics?
• What is the primary function of intercoolers and aftercoolers?
• Which of the following describes demulsibility in lubricating oils?
• What is the primary purpose of scavenging in a 4-stroke engine?
• What is the role of the connecting rod in an engine?
• What is the role of valve springs in an engine?
• What does the term 'water wall' refer to in boiler design?
• What is the primary purpose of the Global Maritime Distress Safety Service (GMDSS)?
• What is the purpose of grooves and lands on a piston?
• What is the key purpose of metering in fuel injection?
• What happens to the volume of a gas when the temperature decreases, according to Boyle's law?
• What does timing refer to in fuel injection systems?
• What function does a selector switch serve in electrical systems?
• How is a closed cooling system characterized?
• What is one advantage of 4-stroke cycle engines?
• What does sensible heat refer to?
• What is one function of an intercooler in an air compressor system?
• What phenomenon occurs when the lubricant cannot adequately separate water?
• What does the term 'slop tank' refer to?
• Where is the steam drum typically located in a boiler?
• What does the acronym MITAC stand for in fuel management?
• What is the function of the journal in a shaft?
• What happens to the temperature of the air when its volume decreases?
• What component is typically used to restore liquid refrigerant from the gaseous state in the system?
• Most line shaft bearings or spring bearings are typically which type?
• Which characteristic is indicative of a reciprocating engine?
• In an engine, what is the primary role of an intake valve?
• What harmful substance is produced when r12 is burned?
• What can excessive vibrations in an engine potentially lead to?
• What is a consequence of having soot buildup in machinery?
• Which of the following is directly involved in the operation of survival crafts?
• Which maritime position does QMED refer to?
• Which type of fuel is known for its environmental impact in maritime operations?
• What is the commonly used term for the tank in a freshwater cooling circuit?
• What term describes the ability of a liquid to convert into vapor?
• What is indicated by the fire point of lubricating oil?
• What does atomizing in fuel injection primarily help with?
• What is another term for the expansion phase in a two-stroke cycle?
• What factor contributes to the overall efficiency of a boiler?
• What is the purpose of sidewall tubes or water wall tubes?
• What is a limitation of refractory material?
• Boiler feed water begins as what type of water?
• What is the standard value for atmospheric pressure at sea level?
• What distinct feature does a poppet valve have?
• What component disconnects the drive mechanism from the propeller shaft?
• Which of the following is a type of starting system for an engine?
• Fuel systems are classified into which two main categories?
• What effect does temperature differential have on the heat transfer rate in an engine?
• What are common drive mechanisms found in engines?
• Exhaust valves must withstand high temperatures and pressures, which is why they are made from what material?
• What is the function of friction bearings in diesel engines?
• What condition can lead to lubricant breakdown in an engine?
• When steam travels through the dry pipe, what is its intended destination?
• Which component can be affected by the formation of sludge and scale?
• In an air conditioning system, which component has the highest temperature drop?
• What is the first requirement for starting a diesel engine?
• How many furnaces do M type boilers have?
• What does a gear train consist of?
• How do lubricating oils assist in cooling engines?
• What factors affect the effectiveness of film lubrication?
• Which of the following describes a gear train?
• What essential elements are required for combustion in an engine?
• What is the reason for insulating steam lines on the deck?
• Firetube boilers are primarily used for what purpose?
• What is the primary function of fittings on the steam drum?
• In terms of fuel delivery, why is atomization critical?
• What is one primary function of a clutch in an engine system?
• What is referred to as the cranking speed of an engine?
• What is the process of internal combustion primarily focused on?
• What is the purpose of atomizing in fuel injection?
• What term describes the force that tends to cause rotational movement of an object?
• The low-pressure cutout switch serves what main purpose?
• What does UFI stand for in fuel injection terminology?
• What are speed-regulating governors used for in machinery?
• Which component is primarily responsible for regulating speed in hydraulic systems?
• What is the first step in the diesel engine operation cycle?
• What is the primary purpose of an economizer in a boiler system?
• In a four-stroke engine cycle, which step occurs last?
• What is the main purpose of a pump?
• The uptake connects the boiler to which component?
• What does the crankshaft do in an engine?
• What does the acronym MARPOL stand for in relation to maritime safety?
• What type of pump is a rotary pump classified as?
• What should you do if one belt breaks in a multi-belt system?
• Which characteristic of lubricating oil is crucial for preventing bearing wear?
• What property is primarily measured by viscosity in lubricating oils?
• What is a primary function of a boiler feed water system?
• The rate of heat in a system is most significantly affected by which factor?
• What type of water system is commonly used in water-tube boilers?
• Prolonged operation at high speed can damage which component of an engine?
• What are the primary components of the R-12 refrigeration system?
• In a gasoline engine, which step follows the compression of the fuel/air mixture?
• In which positions can an impeller be found?
• What is a critical safety procedure related to pumping oily water?
• Why is soot buildup considered a hazard?
• What is the purpose of the water drum in a boiler system?
• Where are moisture separators typically located?
• Which of the following statements best describes the crankshaft?
• The function of the receiver in a refrigeration system is to do what?
• In which application is a positive-displacement pump primarily used?
• Where is the sensing bulb located in the evaporator coil/cooling coil near the outlet?
• Which component does NOT typically assist in controlling the flow of refrigerant in a refrigeration system?
• What is the function of a dry pipe in a steam system?
• What is latent heat?
• To increase fan speed, what adjustment should be made?
• What does GMDSS stand for?
• What does the pour point of lubricating oil indicate?
• In a gasoline engine, what is the state of the mixture before ignition?
• What is the maximum temperature rating for bronze valves?
• Which factor is NOT considered in film lubrication effectiveness?
• In the context of thermodynamics, what is the primary focus of latent heat?
• What is a key limitation of using bronze valves?
• Butterfly valves are primarily used for which purpose?
• What are the two types of wear rings in pumps?
• What does the cyclone steam separator do?
• What component of the boiler is critical for preventing water loss during pressure loss?
• Which of the following is NOT one of the general functions of an injector?
• When a purifier leaks after reassembly, what is usually the cause?
• What does Boyle's law state about gases?
• What does the main thrust bearing primarily manage in an engine?
• What is the primary function of lubricating oil in machinery?
• What primarily affects the rate of heat transfer in an engine?
• What fundamental principle does a centrifugal purifier operate on?
• According to Charles's Law, what happens to pressure when volume is increased?
• What is the purpose of counterweights in an engine?
• What material are exhaust valves typically made of to resist corrosion?
• In an air starting system, how is the engine started?
• What units are used to measure the quantity of heat energy in a substance?
• Who holds the responsibility for pumping bilges in maritime operations?
• The operation of a water-cooled air compressor primarily utilizes which substance?
• What does the piston crown help to achieve in the combustion cycle?
• What does the term impulse refer to in a turbine?
• What is the primary function of the crown or head of a piston?
• What happens when pressure is not bled off before opening a pipe system?
• What does the skirt of a trunk-type piston receive?
• Which of the following is a common effect of dirt in lubricant grease?
• Why is creating pressure important in fuel injection systems?
• What pattern is looked for when honing a cylinder?
• What is the primary consequence of operating without counterweights in an engine?
• What is the primary action that allows an engine to start?
• Oil changes in diesel engines should be performed according to what?
• What defines a gear train in an engine?
• What does TDC stand for in engine terminology?
• Which of the following is one of the most common combustion cycles?
• How does the design pressure relate to boiler safety?
• What is the purpose of identifying TDC and BDC in engine operation?
• Why are low-alloy steels typically chosen for intake valves?
• The quality of ignition in diesel fuel is assessed using which metrics?
• What tool is used to check bearing clearance on small engines?
• Which devices are used in a freon system to prevent the loss of refrigerant?
• What is the primary function of compression rings?
• Oily water should be pumped to which of the following locations?
• What does BDC refer to in an internal combustion engine?
• What happens when the intake air compressor filter is not functioning properly?
• What protects super heaters in a boiler?
• Which devices are used to prevent freon leaks in refrigeration systems?
• Which bearings are prioritized for oil supply in an engine?
• What does a refrigeration ton measure?
• What is the main environmental concern regarding oily water discharge?
• For a diesel engine to start effectively, what must it achieve?
• Under what condition does an oil filter work best?
• What type of valves are primarily used for intake and exhaust in engines?
• In the context of a two-stroke engine, what do TDC and BDC represent?
• What is one important reason to keep steam lines insulated?
• Governors for diesel engines can be categorized into which two general classes?
• How is the hardness of grease typically determined?
• Increasing the diameter of an impeller primarily affects what aspect of the pump?
• What type of fuel do survival crafts typically run on?
• When is an engine considered to be supercharged?
• What do steaming hours refer to?
• What can loose mounting bolts cause in machinery?
• How are petroleum vapors characterized?
• What is horsepower a measure of?
• Which of the following is NOT a stage or type of cooling in air compressors?
• What type of cooling method is typically used for small compressors?
• What is the primary function of an internal combustion engine?
• What is the standard sensing gap measurement in motor systems?
• The main steam system in a ship is characterized as which of the following?
• Which component in the refrigeration system is responsible for expanding the refrigerant?
• How are electric motors measured in terms of performance?
• What is the role of burner and air registers?
• Which ignition type relies on heat generated by the compression of air?
• How do compression rings contribute to engine performance?
• What are the two general classifications of valves?
• Which property of valves is important for their functionality related to exhaust gases?
• What is a common fault associated with governors in machinery?
• What components make up a jerk pump fuel injection system?
• Which property must a lubricant maintain when temperatures change?
• What does proper timing in fuel injection significantly affect?
• What is a pyrometer used to measure?
• What is a common consequence of dirty intercoolers?
• What is a pyrometer used for in an engine?
• How are lube oils typically identified?
• What is the design pressure in relation to operating pressure?
• What can occur if bearings in an electrical motor are over-greased?
• Which material is commonly used for intake valves due to their exposure to lower temperatures?
• How is temperature defined in scientific terms?
• What is the primary function of injecting fuel into the combustion chamber?
• How does the pressure behave when the volume of air decreases?
• What are the two distinct types of pistons mentioned?
• In which part of the refrigeration system is a dehydrator or dryer installed?
• What is the fire point of oil?
• What is the maximum percentage of contamination in diesel lubrication oil that warrants its disposal?
• What are the two key actions that all oil rings must perform?
• What should you do when starting an idle air compressor?
• What are the two main types of gate valves?
• What will happen if a hose assembly is made too short?
• What is the alternative name for the low-pressure cutout switch in a refrigeration system?
• What role does a roots blower play in an engine?
• If fuel is observed coming through the water discharge side on a fuel purifier, what does this indicate?
• What is a potential consequence of inadequate lubrication?
• What type of pump is commonly used to deliver oil under pressure in engines?
• What is the role of the main thrust bearing in an engine?
• What are the two main types of turbines?
• What is the role of viscosity in lubrication?
• Which boiler type is more efficient for high pressure use?
• Where is ship service air primarily utilized?
• What should be done before opening a pipe system?