Comp 4 part 3
Marine Engineering Proficiency Quiz
Test your knowledge and skills in marine engineering with our comprehensive quiz designed for professionals in the field. This quiz covers various topics relevant to propulsion systems, fuel management, and air compressors.
- 50 challenging questions
- Focus on real-world applications
- Great for self-assessment and learning
Which of the listed condition is responsible for causing the gland leak off steam from a propulsion turbine to pass through the gland exhaust condenser?
Compressed air in the pilot
Steam pressure from the low pressure turbine
Steam pressure from the high pressure turbine
The use of gland exhauster fan
The most common diesel engine fuel system problems are caused by ?
Dirty fuel
Excessive vibration
Broken fuel line
In the single-acting diesel engine the cylinder liner area that is most difficult to lubricate is the ?>
Bottom circumference
Minor thrust side
Major thurst side
Top circumference
Which of the following is the direction of the recirculating valve of a boiler return flow to fuel system when firing a cold boiler;?
Directly to the fuel heater to warm the oil
Fuel direct back to the bottom tanks
Directly back to the settling tank for filtration
Fuel direct back to the suction valve of the service pump
Which of the following controls the amount of fuel atomized by return flow oil burner?
Atomizer orifice setting
Fuel oil damper setting
Burner register opening
Fuel oil return valve
Which of the following is the result of excessive high fuel oil temperature?
Fouling of the heaters
A loss fuel suction
Leakage at the burners
Overfiring the boiler
The temperature of the refrigerant in the evaporator coil defends mostly upon the ___.
Cooling water temperature to the condenser
Refrigerant pressure in the evaporator
Heat load in the refrigerator compartment
Solenoid valve in the liquid line
Most of the fuel injection pumps will then closed after injection because they are fitted with a?
Spill valve
Spring loaded discharge check valve
Safety valve
Fuel regulating valve
Calculate the friction power of the engine with indicated power output of 190hp and shaft of 162hp
84.4hp
84Kw
28hp
28Kw
What cause carbon deposits in the fuel heater"?
Low fuel temperature
High fuel viscosity
Low fuel viscosity
High fuel temperature
Cylinder inlet valve failure in a low pressure air compressor can be caused by ?
Valve pounding due to valve covers being excessively tight
Compressor overspeeding due to mechanical failure in the unloader
Carbon buildup on the pistons from excessive lubriction
Sticking valves due to carbon build up on the seats
Slag build up on the boiler furnace refractory is undesirable because it causes___.
Excessive cooling of the brickwork
Shrinking of the brickwork
Fracturing of the anchor bolts
Peeling or spalling of the brickwork
If a higher than normal water level is observed through the inspection port of a low pressure distilling plant you should suspect?
A malfunctioning brine pump
A clogged desuperheater water strainer
Improper vacuum
A leak in the feedwater heater
When a fuel injection nozzle overheated which of the problems listed below can be expected?
The fuel will explode
The fuel metering will vary
The cylinder head will crack
The engine will stop
A suitable location for the installation of an impulse type steam trap would be on the ?
Vacuum drag line from the atmospheric drain tank to the main condenser
Steam supply line to feed heater
Drain line from a high point in the main steam line expansion loop
Horizontal run of drain line from the lowest point at the outlet of the heat exchanger
The greatest decrease in the temperature of refrigerant is at the ___.
Expansion valve
Evaporator
Condenser
Receiver
An air compressor is equipped with intercooler and aftercooler to ?
Inject water vapor into the compressed air
Increase compressor efficiency
Reduce the compressed air charge density
Prevent overheating of first stage valves
What is the cause of excessive low air pressure occurring in the intercooler of reciprocating air compressr?
Leaky discharge valves on the HP cylinder
Insuffiecient intercooler cooling
Leaky discharge valves on LP cylinder
Low ambient air pressure
The pressure developed in the high pressure cylinder of a reciprocating air compressor in order to assure output near of its compression stroke is?
Above the line discharge pressure
Constant throughout the discharge period
Below the line discharge pressure
The same as the line discharge pressure
In addition to a nozzle, a fuel oil atomizer uses which of the listed parts?
Air cone
Burner cone
Space plate
Sprayer plate
In low pressure air compressor the loss of volumetric efficiency normally results from?
Constant enlargement of the clearance expansion volume
Heating of the air leaving the cylinder
Inaccurate valve timing
Adiabatic compression in the intercooler
Liquid is kept from leaking out the shaft ends of a helical gear pump by __.
A stuffing box
The use of shaft end caps
A roller bearing
Overlapping spaces between gear teeth
What part of the boiler provides water circulation to the waterwall tubes?
Water screen tubes
Downcomers
Generating tubes
Riser
Which of the following will happen if the fuel oil heaters attains excessively high temperature?
Fuel oil circulating valve will automatically open
Fuel heater relief valve will open immediately
Carbon deposits will build up in the surfaces
The fuel will loss suction
While making engine room sounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine. This may indicate that the ____.
Drains were left open
Main condenser is too high
Turbine is operating at low speed
Gland seal leakoff line is obsturcted
How does a quick closing valve operate/
A retaining collar is released allowing the valve to close
The valve bridge is collapse remotely allowing the valve to close
An independent mechanism closes the valve
The valve can only be opened and closed hydraulically
Visual inspection of a fuel injector valve, removed during overhaul shows heat discoloration of the lower end of the valve. This is an indication of _.
Valve leakage
Choking of nozzle holes
Insufficient valve lift
Return check valve leakage
Why is the heating capacity of the fuel oil heater reduced when there is a build up of carbonization in the heater surfaces?
Because fluid covers the surfaces reducing the heat transfer
Because radiation heat is reduced
Because thermal conductivity of solidified contaminant is poor
Because relative velocities of the flow of liquid decrease causing corresponding loss of heat transfer
One of the routine task onboard maintenance for gas turbine is mainly of daily visual checks of the running engine. What are you going to execute after a fix number of operating hours to remove any salt deposits on the compressor?
Internal grain wash
Internal water wash
External water wash
External grain wash
What will happen to air compressor unloading system if all of the air charge has been lost from ship service air receiver?
Fail to work but compressor having no load will start with little or no difficulty
Safety interlock will stop the drive motor
Still functional normally to start up
Fail to work and the drive motor will trip the circuit breaker or the compressor will be overloaded
Most fuel injection nozzle are opened by ?
A cam operated follower
Aa spring loaded pressure
Fuel oil pressure
Timing gear keyed to crankshaft
Diesel engine crankcase oil mist detectors are designed to analyze?
The concentration of oil vapours in the crankcase
The temperature of the bearing in the crankcase
Fire risk in the crankcase
The temperature of oil in the crankcase
In a large slow-speed propulsion diesel engine, the side thrust on the crosshead is the direct result of?
The piston rod acting against the crosshead during the power stroke
The angularity of the connecting rod against the crosshead during the power stroke
The velocity of the crankpin during the power stroke
Cylinder pressure acting against the piston crown
Which is the function of boiler diffuser assembly ?
Shapes the fuel particles into a cone
Adds heat to the fuel particle cone
Acts as a shield to prevent flare back
Serves to mix the air evenly with the fuel
What needs to be done in order to maintain the gas turbine sustainable power output?
Internal grain washing
Compressor washing
Turbine washing
None of these choice
When there is excessive formation of frost in the evaporator coils it will?
Reduce efficiency of refrigerating plant
Lessen load on compressor
Keep compartment cooler
System in normal condition
One method of constructing large marine diesel engines and reducing the total engine frame weight is through?
Welding plates to from sections for assembly
Casting interlocking components
Case hardening integral components
Forging integral components
When chemical energy of the fuel is converted to thermal energy during boiler operation the conversation process occurs where?
Economizer
Steam drum
Superheater
Furnace
When turbine rotor shafts extend through the casing an external source of sealing steam is used in conjunction with labyrinth packing to ____.
Provide a constant flow of the gland leak off condenser
Seal the casing during periods of high casing pressure
Seal the casing during of low casing pressure
Maintain the rotor journal temperature
The boiler feedwater control valve varies the relationship between steam and water flow during period of?
Overload operationA
Steady boiler load
Load changeA
Minimum boiler load
Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from?
The throttle station
Within the fireroom
Within the space concerned
Outside the space concerned
Faulty operation of diesel engine fuel injection nozzle can be caused by?
Leakage past the plunger into the oil rain
Water in the fuel oil supply
A distorted fuel spray pattern
Excessive fuel nozzle cooling
In distilling plant, in order to achieve full liquifaction in the condenser. Refrigerant vapour from the evaporator is compressed to a higher pressure. It is because of what purpose?
Speed up the boiling point
Maintain the boiling point
Raise the boiling point
Lower down the boiling point
When a burner atomizer is improperly positioned in the distance piece, it may cause?
Slag formation in the screen tubes
The ends of the flame farthest from the atomizer to be yellowish orange
Erosion in tubes baffles
Oil impingement in the furnace walls
In the most horizontally split centrifugal pump casings, wearing rings are prevented from rotating by_____.
Using one dowel pin pressed into the side of the ring, then fitting the pin into a hole drilled into the side of the casing ring grove
Using an extended lip formed on one half of the ring and using the upper casing half to trap the lip when the casing is reassembled
Swelling the wearing rings into casin
Using wear rings with larger than normal outside diameter
Where are moisture shield located in a main propulsion steam turbine?
At the inner stage diaphragms
On the last stages of the rotor blading
Around throttle valves steam
At the steam strainet inlet
Humidity is the measure of the ?
Plate type heat exchanger
Dry-bulb temperature
Water vapor content
Fluidity of the refrigerant
Increase in rotor clearance in rotary pump will?
Decrease pump capacity
Increase discharge pressure
Decrease reaction ring clearance
Decrease pump cavitation
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