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Questions and Answers
What is the primary purpose of a superheater in a diesel engine?
Which instrument is specifically used to measure the diameter of an object?
In which situation is it necessary to heat diesel oil before injection?
What is the role of a safety valve in a pressurized system?
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What type of pump is most commonly used for main seawater circulation in the engine room?
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What is the flash point of a substance?
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What is the purpose of a hand wheel in a mechanical system?
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Which part of a diesel engine does not move during operation?
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What is a primary function of an oily water separator aboard a vessel?
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In lathe operations, what does the term "facing" refer to?
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Which temperature range is commonly advised for striking an arc in welding operations?
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What is the primary purpose of a depth gauge in mechanical applications?
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What describes the position of the thrust block in a main engine?
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What is the function of a blow down valve in steam systems?
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Which type of valve is designed to allow fluid to flow in one direction only?
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What is sagging in the context of painting?
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Which component in a diesel engine is responsible for introducing fuel?
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Which of the following is considered the most dangerous aspect of oil-fired boilers?
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What is the primary purpose of a centrifugal pump in a marine context?
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When should antifouling paint be applied to a ship's hull?
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Which of the following correctly describes the purpose of a pump in fluid systems?
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Which machine is primarily used for making a new flange for piping systems?
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What kind of washer would be best for maintaining tightness on a nut?
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Which material is least commonly used as an insulating material?
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Why should a CO2 extinguisher be used with caution in confined areas?
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Which part is not included in the fire triangle?
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What is the primary purpose of a fresh water circulation through a diesel engine cylinder?
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What is the purpose of the manhole door on a tank?
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Which instrument is commonly used for testing insulation?
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In a mixture of flammable vapor and air, what does it mean if the mixture is too rich?
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What is the function of a purifier or centrifugal separator in diesel engines?
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What is the incorrect precaution to take before starting maintenance work on any machine?
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Upon what condition should a person wearing BA start to exit a smoke-filled compartment?
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What is the minimum duration a self-contained breathing apparatus should last?
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Which of the following is a common use for globe valves?
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Which component operates alongside a camshaft on a diesel engine?
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What should be checked on an air compressor before starting it?
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Identify the part of a lathe that is used to hold the cutting tool.
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Which material is banned from use as an insulating material due to safety concerns?
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What is the first action to take when discovering a fire onboard?
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What does a gauge glass measure?
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What type of fire involves flammable liquids?
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Which instrument is suitable for measuring the diameter of a circular rod?
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What maintenance task is commonly performed on a pump?
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Which type of fire extinguisher is most challenging to recharge onboard?
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Identify the piping device that aids in preventing heat loss.
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The primary function of a turbocharger in a diesel engine is to:
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Study Notes
Insulating Material
- Plastic, wood, and glass wool are commonly used as insulating materials.
- Firebrick is not commonly used as an insulating material.
Tools
- Pressure gauge: Measures pressure.
- Compound gauge: Measures pressure and vacuum.
- Pressure regulator: Regulates pressure.
- Vacuum gauge: Measures vacuum.
Fire Extinguishers
- Water type extinguisher: Used for Class A fires (solid materials).
- Mechanical foam type extinguisher: Used for Class A and B fires (liquids).
- DCP extinguisher: Used for Class B and C fires (flammable liquids and electrical equipment).
- CO2 extinguisher: Used for Class B and C fires, but should be used with caution in confined areas as it displaces oxygen.
Manhole Door
- A manhole door on a tank is fitted to allow entry to the tank when needed, preventing unauthorized access.
Pliers
- Angle pliers: Used for gripping and bending.
- Combination pliers: Used for gripping, cutting, and bending.
- Wire cutter: Used for cutting wire.
- External circlip plier: Used for removing and installing external circlips.
Welding
- Too long arc length: Causes a flat bead, low penetration, coarse splatter, and possible electrode sticking.
Fire Triangle
- The fire triangle consists of fuel, heat, and air. Electricity is not a part of the fire triangle, but it can be a source of heat.
Welding Arc Length
- The welding arc length should be equal to the diameter of the electrode.
Cylinder Head Components
- Starting valve: Fitted on a cylinder head of a diesel engine.
- Turbocharger: Not fitted on a cylinder head of a diesel engine.
- Indicator valve: Fitted on a cylinder head of a diesel engine.
- Exhaust valve: Fitted on a cylinder head of a diesel engine.
Insulation Testing
- Meggar: Used for testing insulation.
Diesel Engine Components
- Cylinder head: Topmost part of a diesel engine.
- Crankshaft: Located in the lower part of the diesel engine.
- Connecting rod: Connects the piston to the crankshaft.
Fuel Oil System
- Gauge glass: Fitted on oil storage tanks to check liquid level.
- Electrode dryer: Used to dry electrodes exposed to a humid environment.
LEL
- LEL stands for Lower Explosive Limit.
Pumps
- Screw pump: Used for transferring liquids.
- Gear pump: Used for transferring viscous liquids.
- Centrifugal pump: Used for transferring large volumes of liquids.
- Rotary pump: Used for transferring liquids.
Fresh Water Circulation
- Fresh water circulation through diesel engine cylinders is to remove heat of combustion.
Flammable Vapour Mixtures
- When there is too much flammable vapour and not enough air to support combustion, the mixture is considered too rich.
Valves
- Check valve globe type: Prevents backflow.
- Swing check valve: Prevents backflow.
- Butterfly valve: Controls flow.
- Gate valve: Controls flow, often used on pipelines.
Purifier Operation
- During purifier operation, the following should be checked:
- Temperature of heating steam
- Water level in the purifier
- Oil flow from the water side.
Turning Gear
- The turning gear on a main engine is provided for turning the engine during overhaul.
Boiler Water Level
- The instrument used to measure boiler water level is a gauge glass.
Purifier Function
- The function of a purifier or centrifugal separator is to separate solids and liquids.
Fuel Oil Function
- The purpose of fuel oil in a diesel engine is to provide power.
Maintenance Work Precautions
- Remove safety guards: This is the incorrect precaution to take before starting maintenance work on a machine.
Types of Nuts
- Prevailing torque lock nut: Securely locks the nut in place.
- Wing nut: Has wings for easy tightening and loosening.
- Serrated nut: Has serrations to provide a locking mechanism.
- Nut: A standard fastener with a threaded hole.
Breathing Apparatus (BA)
- When wearing BA in a smoke-filled compartment, regularly check your pressure gauge and start to return when you have enough air left plus some reserve.
Mounting for Excess Steam Pressure
- The mounting that automatically releases excess steam pressure is called a safety valve.
Pump Function
- The function of a pump is to increase the pressure of fluids.
Steering Gear Components
- Hydrophore unit: A part of a hydraulic system.
- Control unit: Controls the steering gear.
- Actuator unit: Converts hydraulic pressure into mechanical force.
- Power unit: Provides hydraulic power.
Antifouling Paint
- Antifouling paint is applied to the underwater hull immediately after grit blasting the ship bottom.
Actuators for Valves
- Levers/handles are actuators for gate valves.
Flange Creation
- A lathe machine and a drill machine are needed to make a new flange for a pipe.
- You will also need a grinding machine and a drilling machine.
Nut Security
- A spring washer is used to maintain nut tightness.
Paint Flowing Down
- Excessive paint flowing down while painting is called sagging.
Signs
- The image shows a sign indicating chemical danger.
Boiler Function
- A boiler is used for steam generation.
Spanners
- Single end open spanner: Has one open end that fits a specific nut or bolt size.
- Single end open bend spanner: Has one open end that is angled for access to hard-to-reach nuts or bolts.
- Crow foot spanner: A socket-like spanner that fits over nuts or bolts.
- Ring spanner: Has a closed ring that fits around the nut or bolt.
Centrifugal Pump Application
- A centrifugal pump is a part of the bilge system.
Valves
- Quick closing valve: Closes quickly in an emergency.
- Gate valve: Controls flow by opening and closing a gate, often used for large flows.
- Globe valve: Controls flow by opening and closing a needle-like valve, often used for precise flow control.
- Butterfly valve: Controls flow by opening and closing a disc that rotates.
Oil-Fired Boiler Dangers
- The most dangerous aspect of an oil-fired boiler is flame failure, leading to a potential explosion.
Welding Gloves
- Welding gloves are made from tanned leather and are available in 3-finger and 5-finger types.
Gear Pump Application
- A gear pump is most suitable for transferring oil.
Chemical Container Disposal
- Used or expired chemical containers should be disposed of as per the maker's instructions.
Machine Safety
- The incorrect statement regarding machine safety is "switch off the machine immediately if anything goes wrong." It's crucial to assess the situation first and follow proper procedures.
Turbo Alternator
- A turbo alternator is a generator operating on steam produced from the waste heat of the main engine's exhaust gases.
Density Unit
- The unit for density is kg/m3.
Fuel Oil Function (Diesel Engine)
- The purpose of fuel oil in a diesel engine is to provide power.
Spanners
- Adjustable spanner: Can adjust to fit different nut or bolt sizes.
- Flare spanner: Fitted with a flare shape to fit hexagonal nuts and bolts.
- Both end open spanner: Has two open ends that fit different nut or bolt sizes.
- Combination spanner: Combines an open end and a ring end for versatility.
Boiler Operation
- While the boiler is operating, you should ensure the water level is maintained. Other options are incorrect procedures.
Fire Extinguishers
- Portable fire extinguisher: A handheld extinguisher.
- Mobile foam extinguisher: Larger and wheeled extinguisher.
- Fixed extinguisher: Installed permanently in a space, often triggered automatically.
- Non-portable fire extinguisher: Larger than a portable extinguisher but doesn't need to be transported.
Spontaneous Ignition
- Spontaneous ignition is the ignition of a substance without an external ignition source, due to reaching its auto-ignition temperature.
Diesel Oil Heating
- Before starting an engine on diesel oil, the oil is heated by passing through the purifier.
MEK
- MEK stands for Machine and Engine Knowledge.
Steering Room Checks
- The incorrect check to perform in the steering room is the load of the pump in amperes.
Measuring Diameter
- The instrument used for measuring diameter is a micrometer.
Pliers
- Nose plier: Used for holding and bending small items.
- Electric plier: Designed for electrical work.
- High leverage combination plier: Provides increased leverage for gripping and cutting.
- Circlip plier: Used to install and remove circlips.
Domestic Fridge
- A domestic fridge is related to storing vegetables.
Viscosity
- Viscosity is a term related to a liquid's resistance to flow.
Exhaust Valve Function
- The purpose of the exhaust valve in a diesel engine is to release combustion gases.
Pressure Unit
- The unit of pressure is kg/cm2 or bar.
Machining Holes
- A drill machine will be used for making a hole in a plate.
Fuel Injector Pressure
- Fuel injectors on a diesel engine operate at a pressure greater than starting air, scavenging, compression, and lubricating oil pressures.
Gauges
- Refrigeration gauge: Used to measure the pressure and temperature in refrigeration systems.
- Pressure gauge: Measures pressure.
- Pressure regulator: Regulates pressure flow.
- Vacuum gauge: Measures vacuum.
Main Sea Water Pump
- The main sea water pump used in the engine room is a centrifugal pump.
Drain Valves Purpose
- Drain valves are provided on air bottles to remove condensed water.
Coolant and Hand Washing
- It is true that you should not wash your hands with coolant while working with a machine.
Workshop DON'Ts
- The incorrect statement regarding workshop DON'Ts is "do leave your machine unattended." It's imperative to never leave a machine unattended.
Steam Pressure Adjustment
- Steam pressure is adjusted by using a safety valve to release excess pressure.
Measuring Instruments
- Vernier caliper: A precision instrument for measuring lengths.
- Digital vernier caliper: A digital version of the vernier caliper.
- Micrometer: Used to precisely measure the diameter of an object.
- Depth gauge: Used to measure the depth of a hole or groove.
Thrust Block Location
- The thrust block for the main engine is fitted at the aft side of the engine.
Flash Point
- The flash point is the temperature at which a substance produces enough flammable vapour to flash if exposed to an ignition source.
Oily Water Separator
- The equipment used in the engine room to discharge relatively cleaner water from an oily water mixture is the oily water separator.
Sounding Tape
- A sounding tape is commonly used for measuring the level of liquids inside tanks.
Lathe Operation: Facing
- In lathe operations, facing means cutting a flat surface perpendicular to the axis of rotation.
Bar Unit
- A bar is a unit for pressure.
Parts of a Diesel Engine
- The crankcase is not considered a moving part of a diesel engine.
Hand Wheel
- A hand wheel is an actuator for gate valves and globe valves.
Inlet Valve Function
- The inlet valve on the cylinder head of a diesel engine provides entry for fresh air.
Main Engine System
- The main engine is a part of the propulsion system, which is the system that drives the ship.
Fire Extinguisher Types
- Mechanical foam, DCP, and CO2 are all types of fire extinguishers.
Insulating Material
- It is true that wool garments, blankets, and quilts are terms used as insulating materials.
Electrode Distance
- Electrodes should be kept at a distance of 30-40mm (1.2-1.6 inches) above the spot where you wish to strike the arc.
Cylinder Head Movement
- The cylinder head in a diesel engine stays in place and does not move up and down, open and close, or rotate.
Wrenches
- Flare spanner: Fitted with a flare shape to fit hexagonal nuts and bolts.
- Double ended ring offset spanner: Has two ring ends, one offset at an angle.
- Slogging spanner: A heavy-duty spanner for tightening or loosening large nuts and bolts.
- Combination spanner: Combines an open end for nuts and bolts and a ring end for nuts that are difficult to access with an open-end spanner.
Tanker Deck Operations
- Chipping on the main deck of a tanker is hazardous because of the presence of toxic fumes and oily vapor, which can be ignited by sparks.
Pump Types
- A bilge pump onboard a ship is typically a centrifugal pump.
Flash Point
- The flash point is the lowest temperature at which a substance produces enough flammable vapors to ignite when exposed to an ignition source.
CAM
- A cam is not an actuator. Cams are mechanical components used to transmit motion and timing in engines and other machinery.
Self-Contained Breathing Apparatus (SCBA)
- The minimum duration of a self-contained breathing apparatus should last for 30 minutes.
Chemical Risks
- Spilling is a risk associated with chemicals.
Measuring Diameter
- A micrometer is the instrument used for measuring the diameter of circular rods.
Brush Maintenance
- Brushes that are frequently used should be kept with their bristles immersed in kerosene.
General Alarm
- A general alarm is activated from the bridge and may be due to various reasons, including a fire, blackout, or high bilge level.
Compressor Checks
- While a compressor is operating, you should check the air bottle pressure.
Lathe Parts
- Tool post: A component used to hold various cutting tools on a lathe.
Camshaft Function
- A camshaft on a diesel engine operates the fuel injection pumps.
Globe Valve Use
- Globe valves are most commonly used on steam lines.
Fire Extinguisher Recharge
- CO2 fire extinguishers are the most challenging to recharge on board a ship.
Air Compressor Start-Up
- Before starting an air compressor, you should ensure that the valves on the discharge line are open.
Running Boiler Checks
- While operating a boiler, the water level should be checked.
Sounding Unit
- The unit of sounding is meters/centimeters.
Chemical Use
- Chemicals should not be used for cleaning cooking utensils.
Class B Fire
- A Class B fire involves flammable liquids.
Insulating Material
- The picture shows a sponge insulating material.
Level Measuring Devices
- Level-measuring devices such as gauge glasses are used for tanks of small depth.
Turbocharger Function
- The purpose of a turbocharger in a diesel engine is to increase air supply, which enhances combustion and power output.
Heat Exchangers
- Fuel injector is not a heat exchanger
Bolt Components
- A bolt has a hexagonal head and threads at the other end.
Sounding Pipe Function
- Sounding pipes are fitted on tanks for finding the level of the liquid in the tank.
Steam Use
- Steam from a boiler is used for heating the feedwater system.
Generator Engine Type
- The type of engine normally used for generators onboard ships is a 4-stroke engine.
Machine Restart Precautions
- The incorrect precaution to take before restarting a machine is replace the safety guard after starting the machine. The safety guard should be in place before starting the machine.
Insulating Material Restrictions
- Asbestos is a material banned from use as a fire-resistant insulating material.
Lathe Parts
- A tool post is a part of a lathe.
Hydraulic Actuators
- HYDRAULIC DEVICES are used for actuating relief valves and fuel valves.
Heat Loss Prevention
- The use of insulating material is the main method to prevent heat loss from pipes and equipment.
Starting Valve Function
- The purpose of the starting valve in a generator engine is to allow starting air into the cylinder for starting the engine.
Fire Fighting in Paint Room
- The best method for fighting a fire in a paint room is to use a foam type extinguisher.
Fire Discovery Action
- Upon discovering a fire onboard, the first action should be to activate the fire alarm.
Thruster Placement
- It is false that the thruster placed aft part of the ship is called a bow thruster. This thruster is called a stern thruster.
Lifting Equipment
- Chain block, ratchet block, pulley block, and plummer block are all types of lifting equipment.
Screw Drivers
- A flat screw driver, a Philip screw driver, and a screw driver are all types of screw drivers.
Glasswool Precautions
- It is false that while working with insulating material such as glasswool, you must not protect your body with gloves and goggles. Always take precautions.
Main Fire Pump Location
- The main fire pump is located inside the engine room.
Lathe Operations
- The following operations can be performed on a lathe:
- Turning a cylindrical shape
- Cutting a flat surface perpendicular to the axis of rotation (facing)
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