competence 5

100問 • 2ヶ月前

問題一覧

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

lapping in

While the oily-water separator is operating in the processing mode, what is the probable cause of a low vacuum ?

the coalescer beads are severely fouled

Gland sealing steam is used during steam turbine operation to prevent the loss of

vacuum

clarifier is an oil separator use to remove

Solid particles

Fuel oil penetration into the cylinder of a diesel engine is

reduced by finer atomization

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

Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to

operate with reduced power or stop

The emergency bilge suction valve is typically used ?

If th bilges becomes flooded and they connot be emptied by any other means

Salinity of distilled water produced from fresh water generator onboard depends on the

amount of feed set in fresh water production

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 less than 15 ppm

In a diesel engine, excessive lube oil consumption can be caused by

plugged oil wiper rings

In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the sensing unit is called alan

bellows

Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank ?

Recirculating line to the main condenser

Which of the listed pumps discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant ?

Transfer pump

Which of the following statement is correct to ensure safety to entering a pump room?

a forced ventillation system is operational

In the illustrated hydraulically operated turbine gland seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by alan.

spring

What parts of Oil Discharge monitoring and control system checked the flow rate of the oily water to be discharged is measured ate the discharged pipe ?

A flow meter

Unbalance accumulation of sludge in the bowl can result to

vibration

Boiler wter samples should be circulated through a cooling coil prior to analysis because

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

Discharge of oily mixtures from machinery space bilges of tanekr is prohibited except which of the followinf equipment is fitted ?

Oil discharge monitoring equipment

A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition ?

A vacuum condition has developed in the reservoir

Which of the following actions should be taken FIRST if a bilge-well of a multiple suction bilge system is unable to be pumped out ?

attempt to pump out another bilge well to determine if the entire system is affected

The effect of too much heating in the fuel oil of main engine is

stuck plunger and barrel

Air leakage into the pump casing by way of the packing gland of a condensate pump is prevented by ?

a water seal line to the packing gland

Marpol regulation came into effect stating that the oily water separator which ws previously certified for 100 ppm be change to :

15 ppm

A report when an incident takes place involving the discharge or probable discharge of oil (Annex 1 of MARPOL 73/78) ?

harmful substances report

Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in

Overheating of the system or lowers the operating efficiency of the system

An oily water separator consists of three stages, which one of the following unit segmetns separated the impurites particles ?

Filter stage

Rows of tubes installed along the walls, floor, and roolf of the furnace are called

water walls

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 scale and other solid matter present in the boiler water?

Water drum and headers

Which of the boiler components listed receives feedwater and serves as an area for the accumulation of saturated steam ?

Seam drum

Which of the components listed pervents water from flowing back into the auxiiary exhaust line if the deaerating feed tank becomes flooded ?

Check vavle

Separator functions to separate both solid and liquid impurities of oil is known as

Purifier

What device is used to monitor the fuel consumtion of the ship fuel oil system

Flowmeter

Main propulsion engine lube oil sumps should be constructed

with a sloped bottom

The lubricating oil consumption in a running diesel engine if excessive can be caused by

excessive valve-guide clearance

What is the larges sourde of tanker pollution?

Routine discharge during ballast and tank cleaning

Metallic packing rings are installed in turbine diaphragms to prevent.

interstage steam leakage along the shaft

When centrifugal pump is overhauled, it was found 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.

In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the

atmospheric drain tank

What is the reason why a centrifugal bilge pump requires priming ?

Due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller

A good quality oil used in main propulsion engine lubrication systems should be

resistant to permanent emulsification

The major difference between the discharge and suction vavles installed in most low pressure, reciprocating air compressors is that.

one valve seats upwards, while the other seats downwards

The purpose of the relief valve in a fuel oil service system is to

protect the service pump from high discharge pressure

Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust?

Single flow reaction turbine

Which of the following actions should be taken to reestablish a blown 'blown' air ejector loop seal?

Momentarily close the valve in the loop seal line, then reopen slowly.

Which of the following problem is the most probable cause if an operating bilge pumps is developing good vacuum, but is unable to discharge any water?

The suction strainer is clogged

The ability of an oil separate cleanly from an oil and water mixture is referred to as its ?

demulsibility

Demulsibility of a lube oil is define as,

the ability of oil separate from water

Foot valves are primarily designed to

enable a pump and its suction line to remain primed prior to starting the pump

What is used to supply the energy to compress and move low pressure compressible fluids or gases through a trunking system ?

Fan

A common type of air heater used in sectional header marine boilers is the .

gas tubular type

A multistage centrifugal pump can be BEST described as having

two or more impellers housed together in one casing and munted on a single shaft

In a main propulsion turbine installation, the condensate pump initially discharges to the

air ejector condenser

What is the reason why a positive displacement which a helical gear pumps are well suited for pumping oil?

They are essentially self-priming and capable of a high suction lift

If teh fuel oil temperature in the fuel oil heater attains an excessive temperature, what will happen ?

Carbon deposits will build up on the heating surfaces

By which of the methods listed is the recirculating valve in the main condenser recirculating line designed to be controlled?

Thermostat

Air removed from the main condenser is vented to the atmosphere through the

aftercondenser

The way to dispose the bilge slop on an ocean going ship having an inoperative oily water separator is by

Holding its slop onboard until they can be discharged to a shoreside reception facility

Design characteristics of a velocity-compounded impulse turbine include the utilization of .

a single pressure stage with two or more velocity stages

Part of the centrifugal disc purifier use to hold disc in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called

Distributor

In the fixed vane type emergency fire pump priming vacuum pump. After one week fire pump was not taking action. The vacuum is engaging, but not developing vacuum in the suction side. What might be the cause ?

Suction filter of the pump clogged

Gate valve should not be use for throttling as

wire drawing of the disc will result

Demulsibility of a lube oil is defined as

the ability of oil to separate from water

When a nozzle tester is being used to test a Oclocka type fuel injection nozzle, a clogged nozzle orifice will be indicated by a

distorted spray pattern

When heating fuel oil used in main propulsion boilers aboard ship, the flash point may be exceeded only when.

it is required for proper atomization

Discharge of oily mixtures from machinery space bilges of tankers is prohibited except, amongst other requirement, which of the following equipment is fitted

Oil Discharge Monitoring Equipment

The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the

feedwater vapor pressure

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?

Remove metal from the heavy side by machining in a lathe

Demulsibility of a lube oil is defined as

the ability of oil to separate from water

Which of the tube types listed can be considered to served as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers?

Superheater support tubes

What is the purpose of the booster unit in a fuel oil system ?

To condition the oil for good combustion

Air is normally bled from a diesel engine fuel system by

loosening the compression nuts at the injectors

What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil ?

Purifiers

What do you install to connect bilge and ballast line ?

non-retrun valve

Engineers use nomogram to get the correct

Size of gravity disc

The significant element contained in fuels that determines the specific heat is

hydrocarbon

The separation chamber of the purifier is called

Bowl

The bilge system has been performing well. However, the aft starboard engine room bilge-well suddenly fails to be pump out. Which of the following should be done to determine the cause?

Attempt to pump out another bilge well to determine if the entire system affected

What is required to overcome the head difference when pumping ballast water from bottom tanks to a higher level through the ship's side overboard valve ?

Energy

Lubricating oil used in the cylinder liner neutralizes acids produced by the burning of high sulfur fuels to prevent.

Corrosion

What happens when oil is heated?

The specific gravity increases

What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil?

Purifiers

A centrifugal pump will vary directly to the discjarge head of what part ?

Square of the impeller diameter

Heating the oil make the oil,

less viscous

Which of the following statemetns is correct regarding the start-up operation of a noncondesning turbine-driven feed pump?

Open the pump suction valve prior to admitting steam to the turbine.

What is this term "maceration" that refers to the process in seawage treatment?

Breaking up of solid matter in to fine particle

Ballast pump suction filter was cleaned and pump was lined up and it was found that there was some leakage in the filter. The pump started and teh leakage started. During the deballasting it was found that the pump could not take suction from one of the double bottom tank. The cause could be

pump was drawing air fro suction filter

Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as

dirty ballast

A sample of boiler water can be chemically tested by initially adding a few drops of a specific color indicator, slowly titrating a standard solution into the water sample unit the.

sample undergoes a definite color change

In an operating lube oil system, the excess of water can be detected by:

the amount of water discharging from the lube oil purifier

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 pressuer will the valve reseat?

273 psig.(1983 kPa)

Foot valves are primarily designed to

enable a pump and its suction line to reamin primed prior to starting the pump

In a multistage reaction turbine, the dummy piston and cylinder function to.

reduce axial thrust

The recirculated oil in the fuel oil system is collected in the

Mixing tank

As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to.

introduce a control for maintaining constant steam pressure regardless of boiler load

What is the characteristic of lubricating oil which causes additional centrifuging requirements for proper purification?

Low oil demulsibility

What corrective action is required if a centrifugal pump gradually develops insufficient discharge pressure

Replace the wear rings

What parts of Discharge Monitoring and control system installed at the overboard so that it must close and stop discharge when permissible limit has been reached?

An overboard valve control system

100

Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will results in ?

lowers the operating efficiency of the system

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問題一覧

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

lapping in

While the oily-water separator is operating in the processing mode, what is the probable cause of a low vacuum ?

the coalescer beads are severely fouled

Gland sealing steam is used during steam turbine operation to prevent the loss of

vacuum

clarifier is an oil separator use to remove

Solid particles

Fuel oil penetration into the cylinder of a diesel engine is

reduced by finer atomization

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

Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to

operate with reduced power or stop

The emergency bilge suction valve is typically used ?

If th bilges becomes flooded and they connot be emptied by any other means

Salinity of distilled water produced from fresh water generator onboard depends on the

amount of feed set in fresh water production

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 less than 15 ppm

In a diesel engine, excessive lube oil consumption can be caused by

plugged oil wiper rings

In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the sensing unit is called alan

bellows

Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank ?

Recirculating line to the main condenser

Which of the listed pumps discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant ?

Transfer pump

Which of the following statement is correct to ensure safety to entering a pump room?

a forced ventillation system is operational

In the illustrated hydraulically operated turbine gland seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by alan.

spring

What parts of Oil Discharge monitoring and control system checked the flow rate of the oily water to be discharged is measured ate the discharged pipe ?

A flow meter

Unbalance accumulation of sludge in the bowl can result to

vibration

Boiler wter samples should be circulated through a cooling coil prior to analysis because

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

Discharge of oily mixtures from machinery space bilges of tanekr is prohibited except which of the followinf equipment is fitted ?

Oil discharge monitoring equipment

A vacuum condition has developed in the reservoir

Which of the following actions should be taken FIRST if a bilge-well of a multiple suction bilge system is unable to be pumped out ?

attempt to pump out another bilge well to determine if the entire system is affected

The effect of too much heating in the fuel oil of main engine is

stuck plunger and barrel

Air leakage into the pump casing by way of the packing gland of a condensate pump is prevented by ?

a water seal line to the packing gland

Marpol regulation came into effect stating that the oily water separator which ws previously certified for 100 ppm be change to :

15 ppm

A report when an incident takes place involving the discharge or probable discharge of oil (Annex 1 of MARPOL 73/78) ?

harmful substances report

Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in

Overheating of the system or lowers the operating efficiency of the system

An oily water separator consists of three stages, which one of the following unit segmetns separated the impurites particles ?

Filter stage

Rows of tubes installed along the walls, floor, and roolf of the furnace are called

water walls

Water drum and headers

Which of the boiler components listed receives feedwater and serves as an area for the accumulation of saturated steam ?

Seam drum

Which of the components listed pervents water from flowing back into the auxiiary exhaust line if the deaerating feed tank becomes flooded ?

Check vavle

Separator functions to separate both solid and liquid impurities of oil is known as

Purifier

What device is used to monitor the fuel consumtion of the ship fuel oil system

Flowmeter

Main propulsion engine lube oil sumps should be constructed

with a sloped bottom

The lubricating oil consumption in a running diesel engine if excessive can be caused by

excessive valve-guide clearance

What is the larges sourde of tanker pollution?

Routine discharge during ballast and tank cleaning

Metallic packing rings are installed in turbine diaphragms to prevent.

interstage steam leakage along the shaft

When centrifugal pump is overhauled, it was found 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.

In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the

atmospheric drain tank

What is the reason why a centrifugal bilge pump requires priming ?

Due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller

A good quality oil used in main propulsion engine lubrication systems should be

resistant to permanent emulsification

The major difference between the discharge and suction vavles installed in most low pressure, reciprocating air compressors is that.

one valve seats upwards, while the other seats downwards

The purpose of the relief valve in a fuel oil service system is to

protect the service pump from high discharge pressure

Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust?

Single flow reaction turbine

Which of the following actions should be taken to reestablish a blown 'blown' air ejector loop seal?

Momentarily close the valve in the loop seal line, then reopen slowly.

Which of the following problem is the most probable cause if an operating bilge pumps is developing good vacuum, but is unable to discharge any water?

The suction strainer is clogged

The ability of an oil separate cleanly from an oil and water mixture is referred to as its ?

demulsibility

Demulsibility of a lube oil is define as,

the ability of oil separate from water

Foot valves are primarily designed to

enable a pump and its suction line to remain primed prior to starting the pump

What is used to supply the energy to compress and move low pressure compressible fluids or gases through a trunking system ?

Fan

A common type of air heater used in sectional header marine boilers is the .

gas tubular type

A multistage centrifugal pump can be BEST described as having

two or more impellers housed together in one casing and munted on a single shaft

In a main propulsion turbine installation, the condensate pump initially discharges to the

air ejector condenser

What is the reason why a positive displacement which a helical gear pumps are well suited for pumping oil?

They are essentially self-priming and capable of a high suction lift

If teh fuel oil temperature in the fuel oil heater attains an excessive temperature, what will happen ?

Carbon deposits will build up on the heating surfaces

By which of the methods listed is the recirculating valve in the main condenser recirculating line designed to be controlled?

Thermostat

Air removed from the main condenser is vented to the atmosphere through the

aftercondenser

The way to dispose the bilge slop on an ocean going ship having an inoperative oily water separator is by

Holding its slop onboard until they can be discharged to a shoreside reception facility

Design characteristics of a velocity-compounded impulse turbine include the utilization of .

a single pressure stage with two or more velocity stages

Part of the centrifugal disc purifier use to hold disc in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called

Distributor

Suction filter of the pump clogged

Gate valve should not be use for throttling as

wire drawing of the disc will result

Demulsibility of a lube oil is defined as

the ability of oil to separate from water

When a nozzle tester is being used to test a Oclocka type fuel injection nozzle, a clogged nozzle orifice will be indicated by a

distorted spray pattern

When heating fuel oil used in main propulsion boilers aboard ship, the flash point may be exceeded only when.

it is required for proper atomization

Discharge of oily mixtures from machinery space bilges of tankers is prohibited except, amongst other requirement, which of the following equipment is fitted

Oil Discharge Monitoring Equipment

The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the

feedwater vapor pressure

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?

Remove metal from the heavy side by machining in a lathe

Demulsibility of a lube oil is defined as

the ability of oil to separate from water

Which of the tube types listed can be considered to served as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers?

Superheater support tubes

What is the purpose of the booster unit in a fuel oil system ?

To condition the oil for good combustion

Air is normally bled from a diesel engine fuel system by

loosening the compression nuts at the injectors

What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil ?

Purifiers

What do you install to connect bilge and ballast line ?

non-retrun valve

Engineers use nomogram to get the correct

Size of gravity disc

The significant element contained in fuels that determines the specific heat is

hydrocarbon

The separation chamber of the purifier is called

Bowl

The bilge system has been performing well. However, the aft starboard engine room bilge-well suddenly fails to be pump out. Which of the following should be done to determine the cause?

Attempt to pump out another bilge well to determine if the entire system affected

What is required to overcome the head difference when pumping ballast water from bottom tanks to a higher level through the ship's side overboard valve ?

Energy

Lubricating oil used in the cylinder liner neutralizes acids produced by the burning of high sulfur fuels to prevent.

Corrosion

What happens when oil is heated?

The specific gravity increases

What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil?

Purifiers

A centrifugal pump will vary directly to the discjarge head of what part ?

Square of the impeller diameter

Heating the oil make the oil,

less viscous

Which of the following statemetns is correct regarding the start-up operation of a noncondesning turbine-driven feed pump?

Open the pump suction valve prior to admitting steam to the turbine.

What is this term "maceration" that refers to the process in seawage treatment?

Breaking up of solid matter in to fine particle

pump was drawing air fro suction filter

Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as

dirty ballast

A sample of boiler water can be chemically tested by initially adding a few drops of a specific color indicator, slowly titrating a standard solution into the water sample unit the.

sample undergoes a definite color change

In an operating lube oil system, the excess of water can be detected by:

the amount of water discharging from the lube oil purifier

273 psig.(1983 kPa)

Foot valves are primarily designed to

enable a pump and its suction line to reamin primed prior to starting the pump

In a multistage reaction turbine, the dummy piston and cylinder function to.

reduce axial thrust

The recirculated oil in the fuel oil system is collected in the

Mixing tank

As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to.

introduce a control for maintaining constant steam pressure regardless of boiler load

What is the characteristic of lubricating oil which causes additional centrifuging requirements for proper purification?

Low oil demulsibility

What corrective action is required if a centrifugal pump gradually develops insufficient discharge pressure

Replace the wear rings

What parts of Discharge Monitoring and control system installed at the overboard so that it must close and stop discharge when permissible limit has been reached?

An overboard valve control system

100

Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will results in ?

lowers the operating efficiency of the system