COMPETENCY 9
Marine Engineering Quiz: Competency 9
Test your knowledge with our comprehensive Marine Engineering Quiz focusing on Competency 9. This quiz includes 115 questions that cover essential topics from hydraulic systems to fuel management.
Whether you're preparing for certification or just seeking to refresh your knowledge, this quiz is perfect for you. Get ready to challenge yourself with:
- Multiple-choice questions
- Industry-specific scenarios
- Immediate feedback on your answers
In an close cooling system for a turbo charged four stroke diesel engine, fluctuating water pressure can be cause by?
A totally clogged impeller in the cooling water pump
Improper venting of the cooling system
Carrying the expansion tank water level too high
An incorrectly set cooling system pressure control
To properly use a tube expander, the expander should be placed in the tube to be rolled so that the_______
Rollers bear on the portion of the tube which is in the tube sheet
Mandrel is in direct contact with the inner tube sheet
Belling section is flattened againts the tube sheet
Rollers bear on the portion of the tube which needs belling
During the operation of a lube oil centrefuge, a thin emulsion interface occurs between the lube oil and seal. The position of this interface is determined by the___________
Inside diameter of the ring dam
Initial volume of seal water admitted to the bowl
Outside diameter discharge ring
Number of disk in the disk stack
Which characteristic or condition will have the greatest effect on increasing a hydraulic oil wiscosity?
Pour point
Cloud point
Pressure
Vacuum
Fusible link fire dampers are operated by_____
A break glass and oull cable system
Electrical controls on the bridge
The heat of a fire melting the link
A mechanical arm outside the vent duct
The measure gap between the face of the burner atomizer tip nut and the diffuser plate is determined by the setting of the______
diffuser plate
Atomizer tip nut
Distance piece
Sprayer plate
Which of the ff. Precaution should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?
Only chemically active filters maybe use
Decreased wear rates of components is an advantage of its use
Fluid viscosity always increases as a normal result of its use
Deterioration of paints, seal, metals, and electrical insulation may occur
If the hydraulic governor has been drained and refilled with fresh oil, the engine should be operated until it reaches normal temperature, then the air should be purge by____________
Compensating needle valve full open
Compensating needle valve adjusted by stability
Adjusting rack position
Adjusting speed limiter
Which pressure in an operating hydraulic system is developed______
By the thermal input to the system fluid
Only by the pump as its primary function
By resistance to the fluid flow through the system
Solely by the charge applied by the accumulators
Low scavenging pressure delivered to the engine can cause?
High exhaust temperature in all cylinder
High exhaust temperature in one cylinder
White smoke
All of the above
When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the___________
Bourdon tube
Compenseting spring
Spring return arm
Compound diaphragm
Which of the ff. Material has high tensile strength and corrosion resistance and has been used to replace steel metal in both flat plate form and in matched metal die process where parts are molded in the preformed shape?
Titanium
Fiber glass
Silicon
Rubber
For any piston ring to operate smoothly without scuffing, the ring must be?
Harder than the cylinder liner
Cooler than the surrounding cylinder liner
Lubricated properly during engine operation
Prevent from rotating during the engine operation
Diesel engine starting difficulties due to cold intake air temperature, can be overcome by using an?
Increase in lube oil viscosity
Compression expansion device
Jacket water heater
Increase in starting air pressure
Acetylene should never be used at pressure in excess of 15 psig because the?
Acetylene cylinders have a maximum allowable pressure of 15 psig
Fusible plug will blow out
Relief valve will lift
Slightest backfire could cause an explosion
The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in.
Decreased bearing clearance
Increased bearing clearance
Decrease compression ratio
Increase compression ratio
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by_____
Flash point
Worn shaft seal
Permanent loss of pump suction high level in the oil sump
Low motor rpm
When conducting a routine hydrostatic test on a water tube boiler, you should______
Bypass the economizer
Raise the temperature of the boiler water of 180 deg F
Apply hydrostatic pressure equal to the maximum allowable working pressure of the boiler
Have gags installed on all safety valve
What do you call the portion of a hydraulic hose that determines its overall strength?
Outer cover
Braided inner layers
Outer armor
Inner tube
Why is a hydraulic linear actuator fitted with a cushioning device?
To regulate actuator speed through the entire stroke length
To allow the pump to temporarily operate at a pressure 10 percent above the relief valve setting without lifting the relief valve
all of the above
To slow the action of the piston preventing shock and damage due to hammering effect
The ventilation system aboardship has fire dampers restrained by fusible links that will?
Be replaced before inspection by port authority
Automatically open after a fire is extinguished and then reset the damper
Need replacement if the damper remains closed
Be replaced after each use
Which of the ff. Centrifugal pump components converts the liquid kinetic energy velocity to the potential energy of pressure?
Impeller
Eye
Electric motor
Volute
What is the use of jacking gear on main propulsion turbines?
Reduce turbine speed during maneuvering
Provide complete gear tooth inspection
Lift the reduction gear casing
Provide propulsion in emergencies
What is the possible cause why a lube oil pump fails to build up discharge pressure?
Bypass valve is closed
Suction valve is closed
Suction vacuum is high
Discharge valve is open
What is caused by restriction occurring in the smell orifice of pneumatic control system components?
Insufficient lubrication of the system components
Moisture in the compressed air supply
Excessive dryness in the air compressed air supply
Pressure surging in the compressed air receiver
Which of the ff. Problems occurring in a hydraulic system can be cause by using an oil having a viscosity lower than specified?
Seal deterioration
Increase in internal fluid friction
Condensation and rust formation
Increased wear of moving parts
A work piece has been mounted between centers and a test cut machined at each end to check alignment of the lathe centers. If the test cut on the tailstock end is deeper than the test on the head stock end, the tailstock must be removed?
Away from you to correct alignment
Away from the headstock to decrease the misalignment
Toward you to correct the alignment
Closer to the headstock to reduce the amount of offset
Which of the ff. Is the proper maintenance for a lube oil pum[?
Lubricate once a month
Weekly check up of lube oil level
Check lube oil temperature
Inpect the telltale holes for leakage
Modern trends show that the full flow filters used in multi operation hydraulic system would most likely be located?
In a relief valve discharge line
In the reservoir return line
Between control valves and the actuators
In the reservoir filling line
Which of the ff. Is true concerning the hose threads on compressed gas oxyacetylene regulators and torches?
The acetylene regulator hose outlet thread connection is right handed
The torch acetylene inlet hose thread connection is right handed
The torch inlet hose thread connection is right handed
The oxygen regulator hose outlet thread connection is left handed
In order to install piping easier and to facilitate and disconnect the pump for servicing, which of the ff. Fittings should be use?
Nipple
Flange
Quick disconnect coupling
Union
Which of the factors listed governs the intensity of heat required for any given welding job?
The type of metal being joined only
The strength of the bond body
The strength of the bond and the welding process used
The type of metal being joined and the welding process used
Which internal combustion engine starting system uses a vane type fluid motor?
Electric
Compressed air
Jet flow
Centrifugal
In certain cases, a cylinder liner can be refinished rather than replaced. When properly honed, the?
Counterbore is slick and smooth
Cylinder should be cleaned with kerosene
Liner surface should have a crosshatch pattern
Cylinder liner should have a glazed appearance
What will be the effect of obstructed suction passages in the casing or pintle of a radial piston hydraulic pump?
Pump return and discharge pressure to equalize
Pump discharge flow to drop to zero
Pump back pressure to decrease
Pumped fluid volume to decrease
If the hydraulic governor has been drained and refilled with fresh oil, the engine should be operated until it reaches normal temperature, then the air should be purged by?
Compensating needle valve full open
Adjusting rack position
Compensating needle valve adjusted for stability
Adjusting speed limiter
The purpose of the diffuser in a boiler burner assembly is to________
Diffuse flame to all concerns to the furnace
Assist combustion by heating incoming air
Shield the flame from the incoming air blast while allowing some mixing of fuel and air
Brak up fuel oil into fine spray
What would you do after adding grease to a ball bearing with a hand held grease gun?
Run the machine with the bearing housing drain plug open for a short while
Remove the grease fitting and leave open to allow excess grease to escape
Save the used grease for chemical analysis
Close the bearing housing drain and add a little extra gasses to compensate for air pockets in the bearing
In the case of variable speed centrifugal pump?
Capacity varies directly as the speed
Head varies as the diameter
Capacity varies as the diameter
Power varies as the cube of the diameter
What can cause dirt in a fuel oil system to the diesel engine?
Excessive cooling of the engine
Overspeeding of the engine
Injector damage
Damage to strainers
Why should a return lines in a non pressurized hydraulic system reservoir enter the tank well below the fluid surface level?
Accommodate thermal expansion
Prevent moisture accumulation
Prevent foaming
Prevent vacuum formation
How can the leak in a hydraulic system in a hatch cover be remedied?
Keep the system in operation and tighten the flare nut
Replace both the tubing sections and the fitting
Shut down the power unit and use two wrenches to avoid damaging the tube when tightening
Stop the system and use only one wrench to tighten the flare nut
Which ring dam arrangement should be use for centrifugal purification?
The largest outside diameter ring without loss of oil
The smallest inside diameter ring without loss of oil
The largest inside diameter ring without loss of oil
The smallest outside diameter ring without loss of oil
The larger number of mechanical and pulsating vibrations developed in a diesel engine may damage an attached?
Reciprocating scavenge pump because of its direct linkage to the crankshaft
gas driven turbocharger because it has a wide speed range and high temperature materials that are subject to resonant vibration
Scavenged air pump because it is designed for steady state operation rather than pulsating gas load
Rotary blower because it operates at close tolerances over a small range of speeds and delivers its air charge at a certain resonant frequency
What is a one common cause of cylinder liner wear?
Correct scavenge air temperature
Correctly fitted piston rings
Burning heavy fuel oil with significant amount of sulphur
Engine load changes carried out gradually
On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an ___________.
Tram rod
Bridge gauge
Dial indicator
Outside caliper
Abnormal crankpin bearing and piston skirt surface wear indicate a ______________ ?
A clogged connecting rod oil passage
A restricted air intake
High cylinder firing temperatures
Incorrect connecting rog alignment
Which of the listed interlocks stops the valve in the remote operating valve line of air starting system from opening?
Clutch Lever
All of these choices
Shifting Lever
Turning Gear
While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this effect the steaming boiler?
The steam pressure will drop
The water level will rise
The water level will drop
The steam pressure will rise
The ignition quality of a fuel oil is an important operational consideration because it?
Affects the starting ability of a cold engine
Indicates the amount of abrasive material in the fuel
Affects the compression ratio of an operating engine
Determines the amount of fuel penetration
What will happen if a diesel engine is running in about to dry fuel oil day tank?
Overhead injection pumps
Fuel dilution of the lube oil
Air in the fuel system
Water condensation in the cylinders
With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the __________?
Ignition quality of the fuel
Amount of carbon residue after combustion
Internal flow resistance in the injectors
High heating value of the fuel
Which of the following is the proper maintenance for a lube oil pump?
Inspect the telltale holes for leakage
Check lube oil temperature
Lubricate once a month
Weekly check-up of lube oil level
If the intercooler of a low-pressure air compressor becomes fouled either internally or externally, what will happen?
Volumetric efficiency will be decreased
Normal running time will be decreased
Discharge pressure will decrease
Total capacity will be reduced
Thermocouple pyrometers are sued on large, main propulsion diesel engines to indicate the temperature of the ?
Cooling water leaving each cylinder
Fuel oil entering the injector
Exhaust gases at various locations
Lube oil at the bearing supplies
Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?
Decreased connecting rod bearing clearance
Increased connecting rod bearing clearance
Increased compression ratio
Decreased compression ratio
Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of _____________?
  broken directional control valve centering springs
  low hydraulic oil viscosity
  excessively worn actuator-piston packing
  pump bearings in poor condition
Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the ________________.
Exhaust gases at various locations
Lube oil at the bearing supplies
Fuel oil entering the injector
Cooling water leaving each cylinder
Worn main bearings will cause the compression ratio of an auxiliary diesel engine to ?
Decrease
Increase
Increase on compression; decrease on expansion
Remain the same
After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal?
4000 hours
25000 hours
30000 hours
12000 hours
While your standing your engine room watch at sea, you notice the D.C. Heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?
Do nothing in the particulars as this is a common occurrence aboard this vessel
It is only necessary to immediately open the automatic make-up feed bypass valve
Immediately stop the main engine
Open the make-up feed valve bypass and check the condenser level immediately
Too high exhaust gas temperature in all cylinders is caused by the following except?
Charged air pressure is too low
Overload engine
Stuck-up fuel injection pump
Charged air temperature is too high
Putting additives into diesel engine cooling water is primarily designed to prevent?
Scaling
Freezing
Overheating
Leakages
An advantage of aluminum pistons, when compared to cast iron piston is?
Greater high temperature strength
Better heat conductivity
Increased resistance to wear
Greater weight per cubic inch
With an increase in temperature, the volume of hydraulic oil ______________.
Contracts
Remain the same
Remains constant if pressure decreases
Increases
When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the ____________________?
Compensating spring
Bourdon tube
Spring return arm
Compound diaphragm
What is the fusion of two metals joined together to produce a strong bind as one metal?
Soldering
Welding
Riveting
Brazing
When arc welding, the flux that covers the electrode is used to ______________.
Reduce oxidation
Control penetration
Reduce metal fatigue
Increase heat transfer
Which of the following statements concerning cylinder liner wear in a single acting diesel engine is correct?
Liner wear is distributed equally between upper and lower portions of the cylinder.
Uniformly excessive liner wear will not cause wear on the piston rings and grooves.
Excessive liner wear causes wear between piston rings and grooves.
Liner wear is normally greatest in the middle of the cylinder.
What is caused by restrictions occurring in the small orifices of pneumatic control system components?
Moisture in the compressed air supply
Insufficient lubrication of the system components
Pressure surging in the compressed air receiver
Excessive dryness in the compressed air supply
Some fluid filters used in hydraulic systems are designed to cope with increasing pressure differentials by _________?
Diverting the pump discharge directly back to the suction
 diverting the flow automatically to the standby filter of the duplex unit
  automatically bypassing the fluid via an internal valve arrangement
Automatically securing the system
What do you call a component used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid?
Accumulator
Separator
Filter
Strainers
Below are some of the causes of high exhaust gas temperature except?
Injection of fuel is too late
Excessive carbon deposit on the exhaust valve
Leaky fuel oil nozzle for injector
Poor quality of fuel oil
The longer the ignition delay period resulting from improper use of low cetane fuel, the __________________ ?
Higher the cylinder combustion temperature
More complete the fuel combustion
More rapid the rise in combustion pressure
Less fuel will enter the cylinder
A roller bearing should normally be filled to what fraction of its space cavity?
Less than 1/4
1/3 to 1/2
More than 3/4
1/2 to 3/4
A properly honed diesel engine cylinder liner will ?
Prevent cylinder liner glazing
Prevent piston ring wear
Appear slick and glazed
Shorten the ring break-in period
What size of the circular bar is required to make a hexagonal nut of 16mm sides?
18mm
17mm
19mm
16mm
When normal operating pressure is applied to the hydraulic oil in high pressure system, the oil ______________?
  volume will increase
  viscosity will decrease
  floc point will increase
  viscosity will increase
Which of the listed devices is often clutched to the flywheel of small and medium size diesel engines for the purpose of starting?
Electric generator
Electronic SCR
Magneto
Air motor
The best way to recondition a defective fuel injector is to _____________?
Lap the needle to its seat with metal polish
Send to the nearest authorized repairer
Overhaul, clean and lap with grinding compound
Overhaul and clean each parts
Which of the following refers to the distance between the piston top at BDC and TDC?
The compression clearance
The stroke
The cylinder distance
Any of there choices
The tool used to make up connection fittings for small diameter copper tubing is call a/an __________________.
Flaring tool
Adjustable tube roller
Tubing expander
Adjustable belling tool
What is the principal or main hazard to personnel when a diesel nozzle tester is in use?
Toxic fumes
Explosion
Blood poisoning
Electrical shock
The insulation and screen of diesel engine exhaust manifold should be put back after each overhaul because it ____________?
Insulates noise coming from the engine when running
Enhances the good appearance of the engine
Protects engine personnel from burns due to accidental contact
Protects engine personnel from hot flush
What is the complete tool used for manually cutting threads on pipe?
Stock and die
Tool and die
Chaser
Tap
Which one of the following tool used in precision work to smooth or enlarge a slightly undersized hole?
Hole driller
Reamer
Round file
Round bout
What power is required in maintaining the hydraulic consumer system?
Relief valve
Tank
Motor
Pump
An acceptable method of temporary repairs in the vessels hulls is ?
Shore up the crack with welded brace
Apply a patch of sheet packing backed by a hole and shoring
Drive the wedge
Doubler-plate to be pitted
What type of fits is necessary in the assembly of mating parts with the used of hydraulic press?
Sleeve fits
Transitional fits
Interference fits
Clearance fits
Hydraulic system reservoirs are often fitted with a combined filler/breather cap. What is the effect of a fouled breather element?
Reservoir is pressurized
Flow through the return lines is stopped
Reservoir is subjected to a partial vacuum
Actuator response time is halved
What care and attention should be maintained in a hydraulic system after installing a new hydraulic pump in it?
All system pressure should be readjusted.
The system should be drained and renewed with a fluid of different operating characteristics.
The relief valves in the system should be readjusted.
The filters and strainers should be checked frequently.
Where is the charge for an air starting system stored?
Pressurized tank
Distributor tank
Air compressor
Cylinder check valve
What type of hydraulic pumps most commonly used in steering systems?
Axial piston type
Volute type
Screw type
Lobe type
High jacket cooling water temperature for all cylinders is caused by?
High temperature fuel oil
Faulty turbocharger
Overload engine
Lack of scavenging air
An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to?
Compression set or wear
High fluid flow
Low fluid temperature
Low fluid pressure
A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high?
Compressor final discharge temperature
First stage discharge pressure
Second stage discharge pressure
Pressure in the intercooler
If during operation and the air compressor pressure will not raise, the probable cause maybe?
Cooler pipe has corroded
Ingress of dust into cylinder
Clogged suction air filter
Plugging of oil screen
To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell during a ball anvil outside micrometer and measure the crankshaft journal using a/an _______________.
Inside vernier caliper
Ring snap gauge
Outside micrometer
Telescoping gauge
Automatic control valves for steam service require periodic maintenance inspections because they ______________________.
Are subjected to high compressive stress
Are subjected to a wide range of temperatures and pressures
Receive high pressure air from the pilot valve
Continuously throttle steam resulting in wire drawing and erosion of the valve
Where does the generator cooling water comes from during dry-docking?
Circulating fresh water tanks
Ship's sanitary system
Culating fore or aft peak tank
Ballast pumps
Modern trends show that the full flow filters used in multi-operation hydraulic system would most likely be located __________________.
In the relief valve discharge line
Between the control valves and the actuators
In the reservoir filling line
In the reservoir return line
Which of the devices is commonly used in measuring the clearances between the main engine bearings and the crankshaft?
Copper shims
Wooden gaging pegs
Plasti-gage
Depth gage
Dirty intercoolers on an air compressor will cause?
Excessive consumption
Increased motor current
High pressure in the receiver
Damage to the unloader
What will be the effect of an improperly maintained filter used in a hydraulic system?
Cause leaking of the flexible line connections
Rupture the pump discharge piping
All of the above
Reduce or stop the output action of the actuator
To determine the main bearing clearances in a diesel engine, you should use?
A depth micrometer
An anvil faced micrometer
Plasti-gage
A vernier caliper
What is the use of strainers in hydraulic systems?
Protect the directional control valves
Prevent air from entering the pump
Prevent solid particles from entering the pump
Protect the pump from fine soluble contaminants
While at sea, during you watching the engine room of a steam turbine driven vessel, you notice the main lube oil pump suction strainer vacuum differential has been increasing. To correct this, you should __________________.
Rotate the knife edge cleaning device
Back flush the strainer baskets
Change over strainers and remove the strainer basket for cleaning while the main engine is at normal sea speed
Stop the main engine prior to removing the lube oil suction strainer covers, if simply changing over strainers has not proved satisfactory
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of _______?
Spongy actuator movements
Pump cavitation
Contamination of the oil
Aeration of the oil
The leaking valves in a low pressure, reciprocating, air compressor can result from ________?
Excessive compressor discharge pressure
Abrasion by dust and dirt
Uneven piston stroke in the compressor
Operating the compressor at excessive speed
Acetylene should never be used at pressure in excess of 15 psig because ___________.
Relief valve will lift
Slightest backfire could cause an explotion
Acetylene cylinders have a maximum allowable pressure of 15 psig
Fusible plug will blow out
When checking the tightness of nuts and bolts during diesel engine crankcase and hold down bolt inspection, the quickest and most effective method is?
Checking the stress on the locking plates or split pins
Checking the bolt clearance with feeler gauges
Tapping the nuts and bolts with a hammer
Checking the tightness using torque spanners
What causes the possibility of non atomized fuel dripping from the fuel injection nozzles after injection of the fine fuel mist has finished?
Adjustment of injection pressure too early
Cut off of fuel supply too late after injection
Momentarily increase in the pressure of the oil confined with the pressure piping
Defective fuel injector
In which of the listed hydraulic system components could an o ring seal be satisfactory used in providing a seal?
Relief valve spool
Low pressure pump shaft casing
Linear actuator without nylon insert
High pressure pump shaft casing
What is the next task after fitted piping are welded?
Blank off ends of piping and pressure test to check for leaks
Use joint packing that is suitable for the piping
Blow through with air or steam prior to pipe installation
Clean with water or steam to remove remaining flux
Why would you cut a hole in a boiler tube which has been plugged?
To replace it with a new tube
To identify tube when it is time to renew
To prevent pressure build up
To allow it to turn out more quickly
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