competence 5

52問 • 1年前

問題一覧

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

Purifier

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 increase above this amount?

Exhaust vavle wear is increased

What parts of Discharge Oil monitoring and control system unit calculates the oil discharge in litres/nautical miles and the total quantity when permissable limit has been reached?

A computing unit

Valves used in the machinery space piping systems, and constructd with threaded valve systems, must be

right-hand closing(clockwise)

What control vavle listed below is NOT considered to be hydraulic system directional control vavle?

Unloading valve

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

The purpose of the reaction turbine dummy piston is to

counteract axial thrust toward the turbine low pressure end

Viscosity of fuel in the atommizer can be reduced by

increasing the fuel oil heater steam supply

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

Pump driven clutch

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

The coalescer beads aer severely fouled

What equipment is used to compress a gas and to circulate it around the piping system?

Refrigerating compressor

The Volume of the pump chambers are increase and decrease by the reciprocating motion of the

piston

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

constant-pressure governor

Which of the following statements represents the function of insulating brick?

Acts as backup insulation behind firebrick, plastic refractory, or castable refractory

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

foundation

The viscosity of fuel oil is indicated by its

internal friction

Differential needle valves used in fuel injectors are directly closed by

spring force

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

Feedwater vapor pressure

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

closed

In oily water separator which one of the following stages responsible for removing physical impurities present and promotes some fine separation?

The first-stage filter

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

The amount of sodium phosphate in treated boiler water can be measured by alan.

phosphate test

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

bilge system will lose cacuum and pervent the other bilges from being pumped out

Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For thsi purpose, which of the following steam system is used ?

Gland sealing steam system

Purifier is using gravity disc during oil purification to establish correct

Interface

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

stop check-valve

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

Purifier and clarifier are both working on the principle of

Centrifugal separation

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 is affected.

To avoid oil from discharge into the sea when ballasting

start the cargo p/p then close sea suction valve

Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because.

the realtionship between temperature and viscosity varies with different fuels

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

991kg/m3

Testing boiler water for chloride content will indicate teh amount of

solids in the water from sea contamination

Prior to centrifuging, a heavy residual fuel oils are heated to

reduce fuel viscosity

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

Uneven tightening of casing bolts.

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

What reason why there is less vacuum in centrifugal pump?

Loss on gland packing

Condensate pumps have distinctly noticeable characteristics and are recognized by their

large suction chambers and impeller eyes

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

What is the cause when a centrifugal pump may fail to deliver water when first started ?

Pump is not primed

A test of boiler water for chloride content indicates teh amoung of

seawater contamination present

What functions to provide the right amount of fuel at the right moment and in a suitable condition for the combustion process?

Fuel injection system

When firing a boiler in local manual control, an increase in boiler load must be accompanied by alan.

increase in teh forced draft air pressure before an increase in the fuel oil flow

In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the ?

main feed pump

Before performing any maintainance on a hydraulic system storing energy in an accumulator, you should.

pressurize the system to test for leaks

The size of flexible hose in hydraulic system is indicated by

the numerical designation found on the skin of the hose

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

It can prevent heat damage to fuel injection nozzles by avoiding

long periods of engine overload

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

oil separator

The by-products of oxidation, as a result of water contamination of hydraulic oil are generally ?

gums, varnishes, and acids

Movement of the pump control rack in a fuel injection system using individual plunger-type pumps

varies the quantity of fuel delivered

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

Require more power to turn the shaft.

MPLE

ユーザ名非公開 · 41問 · 13日前

MPLE