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c5

152問 • 1年前

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

Corrosion

Prior to centrifuging,heavy residual fuel oils are heated to _____.

reduce fuel viscosity

If one of the bilge system manifold valve does not properly seat, what effect could be expected during pumping operation?.

bilge system will lose vacuum and prevent the other bilges from being pumped out

Main propulsion engine lube oil sumps should be constructed _______.

with a sloped bottom

Upon disassembling the pump, it is found that the impeller is out of balance. There is no available spare. VWhat will you do if a centrifugal pump vibrates excessively during operation?

Remove metal from the heavy side by machining in a lathe.

Air is normally bled from a diesel engine fuel system by ______.

loosening the compression nuts at the injectors

A test of boiler water for chloride content indicates the amount of

seawater contamination 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

Viscosity of fuel in the atomizer can be reduced by _______

increasing the fuel oil heater steam supply

Foot valves are primarily designed to ______.

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

Valves used in the machinery space piping systems, and constructed with threaded valve systems, must be ______.

right-hand closing (clockwise)

In the fixed vane type emergency fire pump priming vacuum 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?

Suction filter of the pump clogged

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

Breaking up of solid matter into fine particle

By which of the following is the attached vacuum pump of a ballast pump is driven?

Pump driven clutch

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

Purifiers

If a centrifugal pump is not rotating after being overhauled, what may be the possible cause?

Uneven tightening of casing bolts.

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

distorted spray pattern

An oily water separator consist of three stages, which one of the following unit segments separated the impurities and particles?

Filter stage

What parts 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 Flow meter

Clarifier is an oil separator use to remove

Solid particles

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

amount of feed set in fresh water production

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

harmful substances report

In a disk type centrifugal purifier operating as a separator, if diesel fuel was discharging from the waste water outlet, you should _______.

reprime the purifier

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

Purifier

The Volume of the pump chambers are increase and decreased by the reciprocating motion of the _______.

piston

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 suction strainer 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 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 required for proper atomization

Longitudinal expansion of a boiler water drum is permitted by the.

foundation

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

The coalescer beads are severely fouled

What is the largest source of tanker pollution?

Routine discharges during ballast and tank cleaning

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

sample undergoes a definite color change

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

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

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

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

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

Thermostat

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

dirty 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

Purifier and clarifier are both working on the principle of _____.

Centrifugal separation

What is the effect if a double suction centrifugal pump impeller has been installed in the reverse direction?

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 _____.

vary from section to section throughout the heat exchanger

In a diesel engine, excessive Iube 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 a/an

bellows

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?

An overboard valve control system

Demulsibility of a lube oil is defined as ______.

the.ability of oil to separate from water

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

Purifiers

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?

Gland sealing steam system

It can prevent heat damage to fuel injection nozzles by avoiding ______.

long periods of engine overload

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

What do you install to connect bilge and baallast line ?

non-return valve

What reason why there is Less vacuum in centrifugal pump?

Loss on gland packing

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

reduce axial thrust

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

demulsibility

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

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

To avoid oil from discharge into the sea when ballasting _______.

start the cargo p/p then close sea suction valve

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

What control valve listed below is NOT Considered to be hydraulic system directional control valve?

Unloading valve

When the centrifugal disk type purifier is in separation process, the bowl position is _____.

closed

An upper average ash content of 0.1% by weight is generally in heavy fuel oils. Which of the following conditions could be expected if the ash content increases above this amount?

Exhaust valve wear is increased.

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

Carbon deposits will build up on the heating surfaces.

What device is used to monitor the fuel consumption of the ship s fuel oil system ?

Flowmeter

Differential needle valves used in fuel injectors are directly closed by _____.

Spring force

Which of the following 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 İs affected.

What will you install in order to prevent accidental flooding of the engine room bilges?

stop check-valve

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

The coalescer beads are severely fouled

What particular device is installed in the fuel systems of the ship that is used to control the fuel oil temperature to provide correct viscosity for combustion?

Viscosity regulator

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

water walls

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

hydrocarbon

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.

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

the amount of water discharging from the lube oil purifier

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

Check valve

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

Engine room bilge water can be pumped out overboard safely by the use of which equipment listed below?

oil seperator

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

Demulsibility of a lube oil is defined as ______.

the ability of oil to separate from water

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

Low oil demulsibility

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

Spring

The size of flexible hose used in hydraulic system is indicated _______.

the numerical designation found on the skin of the hose

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?

Chemical method

Condensate pumps have distinctly noticeable characteristics and are recognized by their.

large suction chambers and impeller eyes

Which of the following 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 İs affected.

Heating the oil makes the oil ______.

less viscous

Fuel oil penetration into the cylinder of a diesel engine is _____?

reduced by finer atomization

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

Oil Discharge Monitoring Equipment

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 one of the double bottoms tank. The cause could be _______.

pump was drawing air from suction filter

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

aftercondenser

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

gas tubular type

Boiler water 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

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

atmospheric drain tank

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

Transfer pump

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

excessive valve-guide clearance

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

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?

a forced ventillation system is operational

Maximum limit of fuel density to allow efficient oil cleaning of purifier is _______.

991kg/m3

The purpose of the reaction turbine dummy piston is to

counteract axial thrust toward the turbine low pressure end

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

feedwater vapor pressure

The main feed pump discharge pressure is controlled by the admission of steam to the turbine. The admission of steam is regulated by a

constant-pressure governor

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

Square of the impeller diameter

100

Foot valves are primarily designed to ______.

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

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