Competence 4

100問 • 1年前

Leodegario Almaden jr.

通報

問題一覧

Piston area, multiplied by piston stroke, multiplied by number of cylinders, equals engine ?

ÀÀ displacement

One of the major components of centrifugal is ?

impeller

An important point of consideration when replacing a dry type intake filter on an air compressor is to

select the proper size filter so that air flow is not restricted

One of three available centrifugal sea water service pumps is in operation with a seawater temperature of 50 deg fahrenheit. The cooling temperature of all systems supplied by this pump appear to be high. Therefore, which of the following is required ?

start a second pump and place it on line, close the discharge valve on the original pump and watch for a rise in the discharge pressure

It is possible to mount a double suction centrifugal pump impeller with the vanes facing the wrong direction. This woud cause the pump

efficiency to decrease

The primary objective of the auxiliary exhaust system is to supply steam to ?

Dearating feed tank

Increasing the compression ratio of a diesel engine while maintaning the designed rate of fuel flow will result in ?

ÀÀ increased horsepower

To prevent fire inside scavenge air spaces in marine diesel engines, it is important that it should be occassionally?

drained

If it becomes necessary to clean the spray holes of a fuel injector in a diesel engine which following is to be used ?

carbon solvent

When there is excessive formation of frost in the evaporator coils, it will ?

reduce efficiency of refrigerating plant

At what temperature in degree Celsius will safety devices called fusible plug installed in air compressor or compressed air system melts in order to prevent explosion ?

100

What is the meaning of static suction head of a pump?

distance of the suction liquid level above the center line of the pump

Which of these bearings listed below is preferred by makers for use in the engine room supply blowers?

Ball

A loud clicking noise occuring from within the valve compartment of an operating diesel engine would indicate ?

excessive valve clearance

Any unusual or new vibration in the hull or propeller shafting can be an indication of

propeller imbalance

In a single-acting diesel engine. The cylinder liner area that is most difficult to lubricate is the?

minor thrust side

What part of an engine has the function of measuring the speed and changing the fuel control ?

Governor

What is the primary function of a fuel delivery check valve assembly?

To provide rapid fuel injection cut-off

The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work, which is known as ?

friction horsepower

The function of the spring used with channel or plate-type valves for reciprocating air compressors is to

provide positive closing of the valves

Air compressor cylinder unloader enable the compressor to ?

start and come up to speed before air compression begins

What is the function of double-volute casing of a centrifugal pump?

reduce radial thrust to the impeller

What part of a refrigeration system reduces the pressure of a liquid refrigerant?

Expansion valve

One method of constructing large marine diesel engines and reducing the total engine frame weight is through?

welding plates to form sections for assembly

Jacket water temperature in a closed cooling system of a diesel engine is normally controlled by?

the operation of the thermostatic valve

Which of the following will increase when fuel oils are heated?

volume

The capacity of a rotary pump will decrease with and increase in the pump

rotor clearance

Moisture in a refrigation system will cause a

faulty expansion valve

Where are moisture shields located in a main propulsion steam turbine?

On the last stages of the rotor blading

Breaking the fuel into fine spray to provide good combustion is called,

atomizing

Why cruise ship is one of the main candidates for gas turbine propulsion?

The compactness of gas turbines machinery can be exploited to create extra accomodation

An axial pisto, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/cylinder barreland will

cause damage to the pump if not continually drained from the pump casing

What is mainly the reason why fuel injectors used in heavy fuel oil system are provided with cooling?

To reduce carbon accumulation on the nozzles

What is the purpose of maintaining an electrical lamp inside the boiler during a dry preservation method?

To accelerate the drying process

Which of the valves listed below permits its flow in only one direction?

Check valve

The fundamental difference between a 2-stroke and a 4-stroke engine is in the number of ?

piston strokes each one needs to complete a combustion cycle

Which of the following is used extensively to lubricate rooling contact bearing?

Grease

Some engines are using auxiilary electically driven blowers, which is continously running during maneuvering, and automaticaly cut-off , if hte scavenge reaches_ load

50%

The set poing temperature at which the boiler safety valve is to lift to ?

Maximum steam drum pressure

If the control pressure for an automatic combustion control system is lost during maneuvering, you should

switch to manual control

Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by?

a liquid seal

The function of the hydraulic telemotor transmitter used in an electro hydraulic steering gear system is to

transmit the rudder angle to the bridge indicator

Having high exhaust temperatures would affect the ?

efficiency of the engine

In relation to air conditioning system, where is the latent heat of water vapor depends?

dew point

What needs to be done in order to maintain the gas turbine sustainable power output?

Compressor washing

The heat grained per pound of refrigerant in the evaporator is known as they

refrigerating effect

Which of the following purpose of a safety valve fitted in the cylinder cover of a diesel engine?

To release excessive gas pressure from the cylinder

In a distilling plant, in order to achieve full liquification in the condenser, Refrigerant vapour from the evaporators is compressed to a higher pressure. It is because of what purpose.

Raise the boiling point

What is the most effective method in removing water from diesel fuel oil?

By centrifuging the fuel

A pounding noise in a steam cylinder in a mooring winch could be caused by?

excessive bearing clearance

What cause carbon deposits on the obiler burner throat ring?

A dirty atomizer sprayer plate

In a water-tube boiler, how is water level comfirmed

Gauge glass

What may happen if bubbles are present in a refrigerant sytem?

Bubbles may carry moisture that may lead to corrosion

In the refrigeration systerm, the refrigerant absorbs the latent heat of vaporization in the

evaporator

Why is the heating capacity of the fuel oil heater reduced when there is a build up of carbonization in the heater surfaces?

Because thermal conductivity of solidified contaminant is poor

Scavenging fire occur in the engine piston rings are?

leaking

Sub-cooling is the method of reducing the temperature of the liquid refrigerant below its?

condensing temperature

How can we quickly reduce high water level in a steaming boiler?

By the used of surface blow valve

Humidity is the measure of the?

water vapor content

Which turbocharger components increases air density and helps improve engine operating efficiency?

After cooler

The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine

journal bearings

Excess refrigerant in a refrigeration system is normally removed from the

chargin connection of the system

How is power transfered from the main engine located deep inside the hull of a vessel to the propeller at the aft?

Via intermediate and propeller shaft

Which one of the following devices use to control the admission of steam to the steam cylinder of a reciprocating pump?

Pilot valve and operating rod

Cylinder inlet valve failure in a low pressure air compressor can be caused by ?

sticking valves due to carbon buildup on the seats

When should be a boiler water sample be taken for testing?

Before the boiler has been blown down or chemicals added

What is the possible cause why a lube oil pump fails to build up discharege pressure?

suction valve is closed

What is the heat exchanger used to heat the boiler feed water by means of waste gas as it passes from the boiler to the stack?

Economizer

The most common problen encountered by turbo-chargers in a two-strokes engine is?

surging

The ammount of supplied fuel oil on the boiler atomizer depends on the

Fuel pressure

If the existing vapour pressure is subtracted from the indicated pressure at the pump suction, the remainder is the ?

apparent net positive suction head

When the hydraulic control lever for a deck winch is placed in the neutral or off position, the spring set brake on the fluid motor drive shaft is

engaged by spring action and only released by hydraulic pressure

Oil mist detector is an instrument to detect an oil mist formation in the engine crankcase, what cause oil formation?

Overheating of oil

What is the purpose of the boiler drum air cock?

permit escape of air when steam is forming in the drum after lighting off

The demisters installed in a flash-type evaporator serve to ?

Remove small water droplets entrained in the flashed vapor

In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessive. In order to correct for this, you should

insert shims between the crankpin bearing box and teh connecting rod foot

Increasing the valve clearance of a diesel engine intake valve will cause the valve to open?

later and have greater lift

Condensers located in the various stages of the flash evaporator are cooled by?

seawater

What would be the result if the fuel used for boiler burners has sediments?

Clogged atomizer tips

The most important factor in engine performance is the actual power output at the end of the crankshaft for doing work. This is known as?

brake horse power

When operating under constant load, the superheated steam temperature may rise above normal it

feed water temperature is too low

An engineer on duty inspecting an unmanned engine room at night should be aware of which of the following precautions?

Switch on the dead man alarm upon entering the control room

You observed an efficiency drop caused by compressor fouling of the gasturbine, what is the most effective counter measure to carry out?

Off-line washing

In a fuel oil burner having a standard mechanical atomizer, the fuel and air are mixed as the fuel leaves the?

orifice

The difference between the setpoint and the measured pareameter in an automatic flow controller is called;

Error

Why diesel engine lubricating oil need more purification compare with the lubricating oil in a gas turbine?

Gas turbine lubricant does not come into contact with the combustion process

The pressure developed in the high pressure cylinder of a reciprocating air compressor, in order to assure an output near the end of its compression stroke, is?

above the line discharge pressure

Feedwater supplied to a flash type distilling plant will flash to vapor in the first-stage due to ?

flash chamber pressure being lower than the saturation pressure corresponding to the feedwater temperature

Every automated machinery plant must have an engineer assistance alarm. Power for this alarm should be taken from the

general alarm power supply

If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the ?

control air system

If the exhaust oil is returned directly to the pump suction, what type of hydraulic circuit is the system?

closed loop

Explain what is the use of Stern tube?

support and seal the propelelr shaft

The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at?

crankshaft speed in a two-stroke cycle diesel engine

A centrifugal pump mau fail to deliver water when first started if the

pump is not primed

Boiler safty valves are set not to go above maximum operating pressure of higher than?

10%

Which of the following is used as moisture arrester and dryer in the refrigeration system?

Silica gel

Fuel oil enters the main engine cylinder through?

fuel oil injector

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

vacuum

The operation of a thermostatic steam trap depends upon the?

change in the amount of vapor produced within an enclosed chamber

100

Which combination of the main shaft segments listed below that are located furthest from the main engine are connected by the inboard stern tube shaft coupling?

Line shaft and stern tube shaft

Weekly Test 1

ユーザ名非公開 · 50問 · 13日前

Weekly Test 1