COMPETENCY 5
Marine Engineering Knowledge Quiz
Test your understanding of marine engineering principles with our comprehensive quiz! Whether you're preparing for a certification or looking to refresh your knowledge, this quiz covers a wide array of important topics.
Key Features:
- 156 thought-provoking questions
- Multiple-choice format for easy navigation
- Detailed explanations of correct answers
VERY SMALL IRREGULARITIES ON THE SET AND DISCK OF A GLOBE VALVE MAYBE MANUALLY REPAIRED WITH THE VALVE IN PLACE BY THE PROCESS KNOWN_______
REFACING
LAPPING IN
HONNING
SPOTTING IN
While the oily water separator is operating in the processing mode. What is the probable cause of low vacuum?
The bildge suction is completely flooded
The flow control valve 14 is completely open
There is a minor air leakage into oil separator
The coalescer beads is severely fouled
Gland sealing steam is used during steam turbine operation to prevent the loss of.?
Air
Temperature
Vacuum
Oil
Clarifier is an oil separator use to remove_____?
Solid and gas contaminants
Liquid and gas contaminants
Solid and liquid contaminants
Solid particles
Fuel oil penetration into the cylinder of a diesel engine?
Increase by finer atomization
Dependent on fuel injection cut off
Reduce by finer atomization
Nonexistent in a precombustion chamber system
What parts of oil discharge monitoring and control system use to analyze the content of oil in the water is to be discharge overboard?
A flowmeter
An oil content meter
A computing unit
An overboard control valve system
Lubricating oil used in the cylinder liner neutralized acids produced by the burning of high sulfur fuels to prevent _____________________.
Scaling
Cavitation
Erosion
Corrosion
Prior to centrifuging, a heavy residual fuel oils are heated to _______________ .
Increase specific gravity
Reduce fuel weight
Reduce fuel viscosity
Separate fuel from lube oil
If one of the bilge system manifold valve does not properly seat, what effect could be expected during pumping operation?
Bilge-well connected to that valve, plus the second bilge-well being pumped will be completely emptied
Bilge-well aft connected to that valve will siphon its contents with the forward bilge-well
All of the above
Bilge system will lose vacuum and prevent the other bilges from being pumped out
Main propulsion engine lube oil sumps should be constructed _________________.
With drain/return lines terminating just above or at the designated normal level
So as to never be integral with the main engine foundation
With a sloped bottom
Only of nonferrous, noncorrosive metals
Upon disassembling the pump, it is found that the impeller is out of balance. There is no available spare. What will you do if a centrifugal pump vibrates excessively during operation?
Acid wash and scrape the heavy side until it balances.
Weld counterweighs to the light side of the impeller.
Drill holes through the heavy side of the impeller until it balances.
Remove metal from the heavy side by machining in a lathe.
Air is normally bled from a diesel engine fuel system by _______________.
Pumping down the day tanks
Changing fuel filters
Blowing down the air tanks
Loosening the compression nuts at the injectors
A test of boiler water for chloride content indicates the amount of ________.
Dissolved gases present
All of the above
Seawater contamination present
Suspended matter present
Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because ____________.
The relationship between temperature and viscosity varies with different fuels
Residual fuel oils have the same viscosity characteristics regardless of where they are refined
The temperature of the fuel oil varies with the flow rate through the heater
Viscosity regulation eliminated the need for close control of the fuel/air ratio
Viscosity of fuel in the atomizer can be reduced by ________________ .
Changing the size of the orifice
Mixing heavier oil with the fuel
Increasing the fuel oil heater steam supply
Increasing fuel oil pressure
Foot valves are primarily designed to _________________.
Give a pump motor or driver positive protection when operating in a shutoff condition
Enable a pump and its suction line to remain primed to starting the pump
Provide a means of supplying sealing fluid for the impeller shaft stuffing box
Afford the pumping system protection against water hammer and surging
Viscosity of fuel in the automizer can be reduce by______?
Changing the size of the orifice
Mixing heavier oil with the fuel
Increasing the fuel oil heater steam supply
Increasing fuel oil pressure
Valves used in the machinery space piping systems, and constructed with threaded valve system, must be?
Right hand opening (clockwise)
Left hand closing (counter clockwise)
Direction of opening and closing is not important
Right hand closing(clockwise)
In the fixed vane type emergency fire pump. After one week fire pump was not taking suction. The vacuum pump is engaging, but not developing vacuum in the suction side. What might be the cause?
Sealing water tank is full
Vacuum pump not overhauled properly
Suction filter cover gasket leaks
Suction filter on the pump clogged
What is the term "MACERATION" that refers to the process in sewage treatment?
Chemical treatment of the sewage
Breaking up of solid matter into fine particles
Decomposing of waste in a tank
Eliminating bacteria from the sewage
By which of the following is the attached vacuum pump of a ballast pump is driver?
Hydraulic motor
Pneumatic driven clutch
Pump driven clutch
Electrical motor
If a centrifugal pump is not rotating after being overhauled, what may be the possible cause?
Gasket thickness is big
More wear ring clearance
Uneven tightening of casing bolts
Thick packing
When a nozzle tester is being used to test a clock type fuel injection nozzle, a clogged nozzle orifice will be indicated by a_____?
Squealing sound midway in the pump stroke
Distorted spray pattern
Chattering sound when the nozzle closes
Popping sound when the nozzle opens
An oily water separator consist of three stages, which one of the following unit segments separated the impurities and particles?
Collecting chamber
Filter stage
Valve stage
Coalescer stage
What part of Oil Discharge monitoring and control system checked the flow rate of the oily water to be discharged is measured at the discharge pipe?
A flowmeter
An oil content meter
Overboard valve control system
A computing unit
Clarifier is an oil separator used to remove___?
Solid and liquid contaminants
Solid and gas contaminants
Solid particles
Liquid and gas contaminants
Salinity of distilled water produced from fresh water generator onboard depends on the ______
Amount of fresh water leaking from condenser if any
Amount of feed set in freshwater production
Temperature of the seawater used
Efficiency of seawater from the evaporator shell
A report when an incident report takes place involving the discharge or probable discharge of oil(ANNEX 1 of MARPOL 73/78)?
Final report
Harmful substances report
Dangerous goods report
Effective report
In a disk type centrifugal purifier operating as a separator, if diesel fuel was discharging from the waste water outlet, you should_____
Remove the discharge ring
Put in an additional discharge ring
Reprime the purifier
Slow the purifer to its proper speed
Separator function to separate both solid and liquid impurities of oil is known as______
Centrifuge
OWS
Clarifier
Purifier
The volume of the pump chambers are increased and decreased by the reciprocating motion of the___________
Valves
Cylinder
Piston
Chamber
Which of the following problem is the most probable cause if an operating bilge pump is developing good vacuum, but is unable to discharge any water?
The wearing rings are excessively worn.
The discharge valve is clogged.
The shaft is worn.
The suction is clogged.
What is the allowed quantity of oil in water that an oily water separator should be following?
According to Marpol, the oil content of the effluent must be more than 15 ppm
According to Marpol, the oil content of the effluent must be more than 100 ppm
According to Marpol, the oil content of the effluent must be less than 100 ppm
According to Marpol, the oil content of the effluent must be less than 15 ppm
When heating fuel oil used in main propulsion boilers aboard ship, the flash point may be exceeded only when ________.
It is necessary to transfer the fuel
The superheater temperature has been higher than normal
It is required for proper atomization
The boiler is being fired under maximum load
Longitudinal expansion of a boiler water drum is permitted by the ____________.
Refractory
Casing
Tubes
Foundation
While the oily-water separator is operating in the processing mode, if a low vacuum, what is the probable cause?
The flow control valve "14" is completely open
The coalescer beads are severely fouled
The bilge suction is completely flooded
There is a minor air leakage into the separator
What is the largest source of tanker pollution ?
Groundings
Loading and discharging
Collisions
Routine discharges during ballast and tank cleaning
A sample of boiler water can be chemically tested by initially adding a few drops of a specific color indicator, then slowly titrating a standard solution into the water sample until the __________.
Desired pH has been attained in the sample
Sample undergoes a definite color change
Burette reading is zero and the sample color changes
Desired amount of standard solution has been added
Air leakage into the pump casing by way of the packing gland of a condensate pump is prevented by ____________ ?
Special packing in the stuffing box
The vacuum in the pump suction
A water seal line to the packing gland
An air seal line from the compressed air line
Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank?
Freshwater cooler
Saltwater cooler
Recirculating line to the main feed pump
Recirculating line to the main condenser
The way to dispose the bilge slop on an ocean going ship having an inoperative oily water separator is by _____________________.
Pumping them into a settling tank for separation before pumping the oily water residue overboard.
Slowly operating the bilge pump at half capacity so that it never completely dewaters the bilges.
Holding its slops onboard until they can be discharged to a shoreside reception facility.
Circulating them through the lube oil purifier to remove water and debris.
By which of the methods listed is the recirculating valve in the main condenser recirculating line designed to be controlled?
Hand regulation
Preset electrics timing device
Thermostat
Escaping steam
Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as _________.
Crude oil
Clean ballast
Dirty ballast
Segregated ballast
A multistage centrifugal pump can be BEST described as having
Two or more impellers housed together in one casing and mounted on a single shaft
An increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
A single stepped impeller mounted in a progressively staged casing
A large radial clearance between the impeller and casing to prevent overheating due to friction
Purifier and clarifier are both working on the principle of ____________.
Centrifugal separation
Bernoulli
Pascal
Gravity separation
What is the effect if a double suction centrifugal pump impeller has been installed in the reverse direction?
Operate with increased impeller efficiency.
Discharge through the suction side of the pump casing.
Have a greater head capacity.
Require more power to turn the shaft.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will _____________.
Remain constant along the tube's length
Vary from section to section throughout the heat exchanger
Vary according to the fluid pressures
Remain constant throughout the heat exchanger
In a diesel engine, excessive lube oil consumption can be caused by ____________.
Plugged oil wiper rings
Low lube oil pressure
Low lube oil temperature
Late combustion
In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the sensing unit is called a/an _________________.
Manifold
Bellows
Pivot rods and block
Pilot valve
What parts of Oil Discharge monitoring and control system installed at the overboard so that it must close and stop the discharge when permissible limit has been reached?
A Computing unit
An overboard valve control system
A Flow meter
An Oil content meter
Demulsibility of a lube oil is defined as _____________.
The ability of oil separate from water
The temperature at which oil flows rapidly
An emulsion of different grades of oil
A measure of the water in a lube oil system
What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil?
Strainers
Purifiers
Filters
Clarifiers
Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For this purpose, which of the following steam systems is used?
Direct admission of 35 psi (241.3 kPa) auxiliary steam
Superheated steam system
Gland sealing steam system
Gland leakoff steam system
It can prevent heat damage to fuel injection nozzles by avoiding ________________.
Excessive fuel oil temperature
Metallic contact between nozzles and cylinder heads
Long periods of engine overload
Hard carbon deposit and varnish on the nozzles
Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in _______________ .
Accelerated action of the system component
Over speeding of the hydraulic pump
Overheating of the system or lowers the operating efficiency of the system
Extended system life
What do you install to connect bilge and ballast line?
Gate valve
Ball valve
Globe valve
Non-return valve
What reason why there is Less vacuum in centrifugal pump?
Loss on gland packing
Leaky discharge valve
Long suction pipe
Loss of fluid from suction take place
In a multistage reaction turbine, the dummy cylinder piston and cylinder function to________.
Provide a means of measuring axial clearances
Eliminate the pressure drop across the blades
Reduce axial thrust
Dynamic balance of the rotating motor
The ability of an oil to separate cleanly from an oil and water mixture is referred to as its?
Demulsibility
Pour point
Precipitation number
Neutralization number
What is the reason why a positive displacement which a helical gear pump are well suited for pumping oil?
It is not necessary to closely maintain design clearances with this pump
Stuffing box eliminate the leakage problem usually associated with other gear pump
They are essentially self priming and capable of a high suction lift
These pumps are designed with extreme tooth angles
Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as___________
Refacing
Honing
Lapping in
Spotting in
To avoid oil from the discharge into the sea when ballasting_____
Start the cargo pump then open sea strainer valve
Start cargo p/p open sea discharge valve
Start cargo p/p then close sea suction valve
Start cargo p/p then close sea discharge valve
Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counter balance axial thrust?
Single flow reaction turbine
Double flow reaction turbine
Multistage impulse turbine
Double flow impulse turbine
What control valve listed below is NOT considered to be hydraulic system directional control valve?
Two position valve
Three position valve
Unloading valve
Spring control valve
When centrifugal disk purifier is in separation process, the bowl is __________
Open
Half the speed of the motor
Closed
Rotating slowly
An upper average ash content of 0.1 percent by weight is generally in heavy fuel oils. Which of the ff. Conditions could be expected if the ash content increases above this amount?
Increase MEP
Excessive bearing wear
Exhaust valve wear is increase
Glazing the cylinder liners
If the oil temperature in the fuel oil heater attains an excessive temperature, what will happen?
The fuel oil pump will lose suction
Carbon deposit will build up on the heating surfaces
The fuel oil recirculating valve will automatically close
The fuel heater relief valve will open immediately
What device is used to monitor the fuel consumption of the ships fuel oil system?
Flowmeter
Fuel injector
Engine governor
Viscosity regulator
Differential needle valves used in fuel injectors are directly closed by______
Cam action
Firing pressure
Spring force
Fuel oil pressure
Which of the ff. Actions should be taken FIRST if one bilge wells of the multiple suction bilge system is unable to pump out?
Attempt to pump out another bilge well to determine if the entire system is affected
Remove each of the suction manifold valves
Open the bilge pump for inspection
Remove only the suction manifold valve to the affected bolge well
What will you install in order to prevent accidental flooding of the engine room bilges?
Stop check valve
Installing a swing valve
Installing eductors
Using positive discharge valve
While the oily water separator is operating in the processing mode, if a low vacuum, what is the probable cause?
The flow control valve \'14'\ is completely open
There is minor air leakage into the separator
The bilge suction is completely flooded
The coalescer beads are severely fouled
Rows of tubes installed along the walls, floor, and roof of the furnace are called.
Downcomers
Water walls
Screen tubes
Water headers
The significant element contained in fuels that determines the specific heat is___________.
Sulphur
Hydrocarbon
Oxygen
Nitrogen
A hydraulic system gear pump being fed from a reservoir frequently indicates sign of excessive pitting after two months of service. Which of the ff. Would most likely contribute to this condition?
A partial restriction in the return line has developed
Abnormal pressurization is occurring in the reservoir
A vacuum condition has developed in the reservoir.
Operating oil temp. Is determine to be below normal
In an operating lube oil system, the excess of water can be detected by_________
Examining the lube oil strainers
Sounding the lube oil stt. tank
The amount of water discharging from the lube oil purifier
Checking oil for unusually lo temperature
Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded?
Reverse acting relief
Check valve
Exhaust piping
As found in basic pneumatic automatic combustion control system, the function of a standardizing relay is to.
Mechanically position valves or dampers in accordance with the amount of control pressure received
Provide back ups means for manual control of the system
Introduce a control for maintaining constant steam pressure regardless of boiler load
Control the boiler drum water level with in acceptable limits regardless of the load
Engine room bilge water can be pumped out overboard safely by the use of which equipment listed below?
Oil separator
Foam type filter
Oil purifier
Fine mesh filter
Which of the listed boiler components is used to equalize the distribution of water to the generating tubes and provide an area for the accumulation of loose and other solid matter present in the boiler water?
Water drum and headers
Steam drum
Water drum only
Downcomer
Demulsibility of a lube oil is define as?
The ability of oil to separate from water
The temp. At which oil flows rapidly
A measure of the water in a lube oil system
An emulsion of different grades of oil
What is the characteristics of lubricating oil which causes additional centrifuging requirements for proper purification?
Hihg TBN value
Low oil neutralization
Low oil demulsibility
Low oil floc point
In the illustrated hydraulic operated turbine gland seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by an?
Bellows
Pilot valve
Exhaust valve
Spring
The size of flexible hose used in hydraulic system is indicated by___________
The inside diameter of a tube
The thickness of the tubewall
The numerical designation found on the skin of the hose
A color code on the armor
What particular type of sewage treatment is basically a storage tank which collects solid matters for disposal in permitted areas or to a shore collection facility?
External flushing
Biological method
Treatment tank
Chemical method
Condensate pumps have distinctly noticeable characteristics and are recognize by their.
Large suction chamber and impeller eyes
Open impellers and power ends
Speed limiting governors and closed impellers
Multiple impellers and pump shaft position
Which of the ff. Actions should be taken FIRST if a bilge well of a multiple suction bilge system is unable to pump out?
Remove only the suction manifold valve to the affected bilge well
Remove each of the suction manifold valves
Open the bilge pump for inspection
Attempt to pump out another bilge well to determine if the entire system is affected
Heating the oil makes the oil?
Frictionless
Less viscous
Easy to store
Extremely viscous
Fuel oil penetration into the cylinder of a diesel engine is?
Reduce by finer atomization
Dependent on fuel injection cut off
Nonexistence in the pre combustion chamber system
Increase by finer atomization
Discharge of oily mixture from machinery space bilges of tankers is prohibited except which of the ff. Equipment is fitted?
50 ppm bilge water separator with alarm system
Interface oily water detector
Oil discharge water monitoring system
15ppm oily bilge water separator with alarm system
Ballast pump suction filter was cleaned and the pump was lined up and it was found that there was some leakage in the filter. The pump started and the leakage started. During deballasting it was found that the pump could not take suction from the double bottom tank. The cause could be?
The filter was not cleaned properly
One of the pipe lines on the suction side of the pump might be leaking
Pump was drawing air from suction filter
Pump was drawing air from the outside
Air removed from the main condenser is vented to the atmosphere through the ______.
Aftercondenser
Atmospheric drain tank
Vent condenser
Vacuum breaker
A common type of air heater used in sectional header marine boilers is the ___________.
Parallel flow type
Direct contact type
Gas tubular type
Harrison crossflow type
Boiler water samples should be circulated through a cooling oil prior to analysis because ________.
The degree of acidity as measured on the pH recorder is amplified by cool water temperatures
The cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify
It reduces the amount of suspended matter that frequently finds its way into the dead end lines
This keeps the water from flashing into steam as it is drawn from the higher pressure of the boiler to the lower pressure of the fireroom
In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the _____________.
Deaerating feed tank
Auxiliary condenser
Atmospheric drain tank
Loop seal
Which of the listed pumps discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant?
Auxiliary bilge pump
Booster pump
Transfer pump
Centrifuge transfer and discharge pump
The lubricating oil consumption in a running diesel engine if excessive can be caused by ______________________.
Excessive valve-guide clearance
High lube oil temperature
Low lube oil temperature
Clogged lube oil piping
Design characteristics of a velocity-compounded impulse turbine include the utilization of ______________.
One or more nozzles with one row of rotating blades
Two or more simple impulse stages
A low velocity steam jet from a nozzle
A single pressure stage with two or more velocity stages
Which of the following statements is correct to ensure safety to entering a pump room?
The cargo pumps are secured
A forced ventilation system is operational
The oily water separator is de-energized
No mono carbon gases
Maximum limit of fuel density to allow efficient oil cleaning of purifier is ______________.
1000 kg/m³
991 kg/m³
999 kg/m³
989 kg/m³
The purpose of the reaction turbine dummy piston is to ___________.
Counteract axial thrust toward the turbine low pressure end
Eliminate axial thrust caused by velocity increases in moving blades
Act in conjunction with gland seal steam to balance turbine thrust
Assist in maintaining radial clearances
The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the _____________.
Feedwater vapor pressure
Pump capacity in gpm
Speed of the impeller
Impeller ratio of the pump
The main feed pump discharge pressure is controlled by the admission of steam to the turbine. The admission of steam is regulated by a _____________.
Nozzle arrangement
Constant-pressure governor
Speed-limiting governor
Flyweight controlled regulating valve
A centrifugal pump will vary directly to the discharge head of what part?
Cube of the impeller diameter
Change in impeller diameter
Impeller efficiency for large changes in the size of the impeller
Square of the impeller diameter
Foot valves are primarily designed to _______________ .
Give a pump motor or driver positive protection when operating in a shutoff condition
Afford the pumping system protection against water hammer and surging
Enable a pump and its suction line to remain primed prior to starting the pump
Provide a means of supplying sealing fluid for the impeller shaft stuffing box
Separator functions to separate both solid and liquid impurities of oil is knows as __________.
Purifier
Centrifuge
Clarifier
OWS
Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure
Overspeeding of the hydraulic pump
Accelerated action of the system component
Extended system life
Lowers the operating efficiency of the system
What is the reason why a centrifugal bilge pump requires priming?
To initially unload the pump by having its head pressure equal to discharge pressure.
Primarily to lubricate the shaft seals.
Due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller.
In order to overcome the potential energy of water in the discharge line.
The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that ___________.
One valve seats upwards, while the other seats downwards
The reed valves used on the discharge are made substantially thicker and heavier than the suction valves
The suction valve springs exert a greater tension than the discharge valve springs
The discharge valve springs exert a greater tension than the suction valve springs
When seated, the disc of a safety valve has an area of 0.75 square inches (1.9 sq cm). When the valve lifts the area is increased by 10%. If the valve lifts at 300 psig (2170 kPa), at approximately what pressure will the valve reseat?
295 psig (2135 kPa)
284 psig (2059 kPa)
273 psig (1983 kPa)
262 psig (1907 kPa)
A good quality oil used in main propulsion engine lubrication systems should be ______________?
Resistant to permanent emulsification
Quickly chemically oxidized
Free from all chemical additives
Readily saponified with water
Movement of the pump control rack in a fuel injection system using individual plunger-type pumps _____________.
Varies the quantity of fuel delivered
Varies the compression of the delivery valve spring
Changes the position of the fuel inlet ports
Changes the length of the pump stroke
What is required to overcome the head difference when pumping ballast water from double bottom tanks to a higher level through the ship's side overboard valve?
Force
Pressure
Energy
Rpm
Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should _____________.
Pressurize the system to test for leaks
Operate the machine until it reaches normal temperature
Bleed off all pressure within the system
Disconnect the pump pressure control switch
The effect of too much heating in the fuel oil of main engine is ________________.
Stuck plunger and barrel
High corrosion attack
High exhaust gas temperature
Sublimation
Gland sealing steam is used during steam turbine operation to prevent the loss of ______________.
Temperature
Air
Vacuum
Oil
Metallic packing rings are installed in turbine diaphragms to prevent _________________.
Pressure buildup on both sides of the diaphragm
Steam from escaping to the atmosphere
Interstage steam leakage along the shaft
Air from entering the turbine casing
The separation chamber of the purifier is called ___________.
Light liquid chamber
Bowl
Pilot valve assembly
Heavy liquid chamber
What is the purpose of the booster unit in a fuel oil system?
To condition the oil for good combustion
To speed up the fuel oil
To make the oil pressurized
To maintain the fuel at the right temperature
What corrective action is required if a centrifugal pump gradually develops insufficient discharge pressure ?
Replace the wear rings.
Throttle in on the discharge valve.
Throttle in on the suction valve
Replace the lantern rings.
Which of the following actions should be taken to reestablish a 'blown' air ejector loop seal?
Decrease the steam pressure to the air ejector nozzles.
Increase the condensate flow through the air ejector.
Shut off the steam to the second stage air ejector momentarily then open it again.
Momentarily close the valve in the loop seal line, then reopen slowly.
The amount of sodium phosphate in treated boiler water can be measured by a/an.
Phosphate test
Sodium phosphorous test
Alkalinity test
Chloride test
What happens when oil is heated?
Its viscosity will increase
The specific gravity increases
Fuel will have higher specific heat
It will expand in volume
Which of the following statements is correct regarding the start-up operation of a noncondensing turbine-driven feed pump?
Secure all drains prior to admitting any steam to avoid damage to traps.
Open the pump suction valve prior to admitting steam to the turbine.
Keep the steam exhaust valve closed until steam is applied to ensure that the auxiliary exhaust line pressure does not drop.
Keep the pump casing vent valve closed until flow is established through the pump.
Testing boiler water for chloride content will indicate the amount of ____________.
Total alkalinity in the water
Solids in the water from sea contamination
Methyl orange that should be added
Phosphates present in the water
What parts of Oil Discharge monitoring and control system used to analyze the content of oil in the water that is to be discharged overboard?
An Oil content meter
A flow meter
An overboard valve control system
A computing unit
The purpose of the relief valve in a fuel oil service system is to _____________ .
Protect the service pump from high discharge pressure
Supply constant pressure to the burner combustion control valves
Regulate the atomizer oil pressure
Control the oil pressure regulators
Marpol regulation came into effect stating that the oily water separator which was previously certified for 100 ppm be changed to:
100 ppm
25ppm
50 ppm
15 ppm
Demulsibility of a lube oil is defined as ______________ .
A measure of the water in a lube oil system
The temperature at which oil flows rapidly
The ability of oil to separate from water
An emulsion of different grades of oil
In oily water separator which one of the following stages responsible for removing physical impurities present and promotes some fine separation?
Coalescer inserts
The second-stage filter
Collecting chamber stage
The first-stage filter
What is the result of the centrifuge if the bowl of a centrifugal purifier is improperly reassembled with O-ring seals that have become hard and flat ?
Will begin to lose its water seal.
Will discharge oil to the main sump as dirty as the input.
Bowl will rotate at a lower speed.
Bearings will be permanently damaged.
The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the ____________________ .
Impeller ratio of the pump
Feedwater vapor pressure
Pump capacity in gpm
Speed of the impeller
Discharge of oily mixtures from machinery space bilges of tankers is prohibited except when, amongst other requirement, which of the following equipment is fitted?
Interface oily water detector
Oil Discharge Monitoring Equipment
15 PPM oily bilge water separator with alarm system
50 PPM bilge water separator with alarm system
Gate valves should not be used for throttling as _____________.
Air binding will develop
The pressure drop will be excessive
Wire drawing of the disc will result
The installation of an equalizing line will be necessary
The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally _____________?
Removed by cellulose type filters
Always neutralized by oil additives
Harmless and have no effect on system components
Gums, varnishes, and acids
Which of the boiler components listed receives feedwater and serves as an area for the accumulation of saturated steam?
Steam drum
Headers
Water drum
Superheater headers
Which of the tube types listed can be considered to serve as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers?
Water screen tubes
Water wall tubes
Riser tubes
Superheater support tubes
Purifier is using gravity disc during oil purification to establish correct ___________.
Purifier speed
Interface
Inlet pressure
Temperature
The bilge system has been performing well. However, the aft starboard engine room bilge-well suddenly fails to be pumped out. Which of the following should be done first to determine the cause?
Attempt to pump out another bilge well to determine if the entire system is affected
Remove each of the manifold valves
Remove only the manifold valve to the affected bilge-well
Open the bilge for inspection
What equipment is used to compress a gas and to circulate it around the piping system?
Circulating pump
Liquid ring pump
Forced draft fan
Refrigerating compressor
When centrifugal pump is overhauled, it was fount that shaft had developed grooves on it and no spare is available onboard, what action can be taken?
Machine the shaft sleeve on lathe and put back the new packing.
Order a new spare.
Assemble the pump without doing anything and wait for the spare to arrive.
Leave the pump as it is.
The recirculated oil in the fuel oil system is collected in the _________________ .
Settling tank
Mixing tank
Double bottom tank
Daily service tank
In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the ?
Air heaters
Distilling plant
Main feed pump
Main condenser
What parts of Discharge Oil monitoring and control system unit calculates the oil discharge in litres/nautical miles and the total quantity when permissible limit has been reached?
An overboard valve control system
A flow meter
A computing unit
An Oil content meter
While the oily-water separator is operating in the processing mode, what is the probable cause of a low vacuum?
There is minor air leakage into the separator
The bilge suction is completely flooded
The flow control valve "14" is completely open
The coalescer beads are severely fouled
Engineers use nomogram to get the correct ____________.
Adjustment of throughput
Temperature
Feeding pressure
Size of gravity disc
The viscosity of fuel oil is indicated by its _______________________.
S.A.E. number
Internal friction
Weight
Demulsibility
Which of the following statements represents the function of insulating brick?
Acts as backup insulation behind firebrick, plastic refractory, or castable refractory.
Acts as a gas-side layer at high temperature areas in D-type boilers.
Provides structural stability.
Provides the first layer at the inside of inner casing.
What functions to provide the right amount of fuel at the right moment and in a suitable condition for the combustion process?
Booster unit
Fuel injection system
Viscosity monitoring system
Fuel oil regulator
Unbalance accumulation of sludge in the bowl can result to ______________.
Vibration
Leaking oil to water outlet pipe
Slow discharge of purified oil
Excessive sealing water
What is used to supply the energy to compress and move low pressure compressible fluids or gases through a trunking system?
Fan
Eductor
Copressor
Pump
What is the cause when a centrifugal pump may fail to deliver water when first started?
Impeller is flooded.
Pump is not primed.
Water seal pipe is plugged.
Seal ring is improperly located.
Part of the centrifugal disc purifier use to hold discs in place and directs the flow of dirty liquid to bottom then to the discs as the oil flows upward is called ______________.
Distributor
Main cylinder
Bowl
Top disc
In a main propulsion turbine installation, the condensate pump initially discharges to the ____________________.
First stage heater
Distillate tank
Deaerating feed tank
Air ejector condenser
When firing a boiler in local manual control, an increase in boiler load must be accompanied by a/an ___________________.
Increase in the forced draft air pressure before an increase in the fuel oil flow
Increase or a decrease in the fuel oil flow and forced draft air pressure simultaneously
Decrease in the forced draft air pressure before a decrease in the fuel oil flow
Increase in the fuel oil flow before an increase in the forced draft pressure
Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to ________________.
Burn excessive amounts of lube oil
Run away without load
Operate with reduced power to stop
Overheat without smoking
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