轮机英语

0002

Reliability

is prime important characteristic for a marine power plantprinciple

可靠性是船舶动力装置的首要特征

0015

Propulsion of the vast majority of contemporary merchant ship

（

especially container ships

and VLCCs

）

utilizes

diesel engine

as prime mover

当代大都数商 船

(

特别是集装箱船和大型油船

)

都采用柴油机作为船舶的推进装置

0016

The medium speed 4-stroke trunk piston engine

can be found on most medium to large

merchant vessels even if the main engine is either a steam turbine or a 2-stroke crosshead engine

0017

Medium

speed

engines

have

a

higher

power

to

weight

ratio

than

the

slow

speed

two

strokes ,but due to the higher speeds tend to have

reduced

maintenance intervals

0048

The bedplate is secured by means of side-chock bolts and end-chock bolts

0065

A main b earing consists of two shells which are secured by manes of studs and

bearing

caps

0072

According to the principle of four- stroke diesel engine, what is the number of its efficient

work stroke per revolution? 1/2

0103

For an ordinary four-stroke engine the inlet valves open

before STDC

0128

Shims of different thicknesses are inserted between the shells to enable adjustment of

the

bearing clearances

0137

The

connecting

rod

is

fitted

between

the

crosshead

and

the

crankshaft.

It

transmits

the

firing force ,and together with the crankshaft converts the

up and down

motion to a

rotary.

0143

The four- stroke engine is used for

alternator

and sometimes for main propulsion with a

gearbox to propeller speed of between 90 to 120 rev/min.

0163

The

sealing

function

of

the

piston

ring

is

brought

about

by

the

gas

pressure

above

and

behind

the

piston

ring,

which

forces

it

downwards

against

the

bottom

of

the

ring

groove,

and

outwards

against the cylinder wall.

0195

The

viscosity

regulator

controls

the

fuel

oil

temperature

in

order

to

provide

oil

at

the

correct viscosity for combustion.

0210

Because the timing of injection is crucial,

cams

mounted on the camshaft, which is driven

by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

0246

In diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring

about combustion is called

ignition delay

.

0270

The

burning

of

fuel

oil

in

a

diesel

engine

having

a

high

sodium

content

,

will

cause

corrosion and grooving of exhaust valves.

0276

The ignition quality of diesel fuel is indicated by its

cetane number.

0302

When

the

heavy

fuel

oil

is

heated

to

achieve

the

viscosity

of

10~15

cSt,

boiling

and

cavitations

may occur. To avoid this, a

pressurized

system is used in most occasions.

0309

Which of the following statements is correct regarding an oil with a high viscosity index?

Very little change in viscosity occurs with a significant change in temperature.

0326

A

lubricant

often

has

to

perform

many

duties

in

any

situation,

in

addition

to

its

fundamental job of

reducing friction

0345

In motor-ships,

the lubricating oil

, after passing through main and motion bearings and

oil cooled pistons, etc, is either retained in the bedplate.

0450

Shaker, circulation, and spray are the three general methods used in

piston cooling.

0475

The lower

the oxygen content in the exhaust gas,

the better

the combustion is.

0476

A

built-up

exhaust

valve

is

one

in

which

the

stem

and

heads

are

made

of

different

material.

0486

An electrically driven automatically operating auxiliary blower is provided for slow speed

and

manoeuvring operations

of a low speed diesel engine.

0502

If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if

the

scavenge

trunk

is

adjacent

to

the

crankcase

with

risk

of

hot

spot

developing,

it

sometimes

becomes necessary to

stop

the engine.

0523

Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished

during the

valve overlap period.

0559

A

high

temperature

alarm

or

a

flame

trap

which

will

melt

is

used

to

guard

against

the

explosion of compressor air pipelines.

0596

A device which functions to bring a diesel engine

to a full

stop to

protect

it from

damage is known as a/an

over-speed trip

0621

The purposes of the compensating adjustment

used in a diesel engine hydraulic governor

is to

prevent governor hunting

0623

The reversing

cams of some of four-stroke/cycle diesel engines are brought into position

by

sliding the camshaft along its axis

0633

Which of the listed governor characters will greatly affect the

load sharing relationship

between

paralleled diesel generators

speed drop

0638

A properly honed

diesel engine cylinder liner will

shorten the ring break-in period

0639

A pyrometer is an instrument used measure the temperature of the diesel engine

exhaust

0640

After staring a diesel engine ,which of the operating conditions should be checked first?

Lube oil pressure

0644

A

disadvantage of a two-stroke/cycle diesel engine is

higher working temperatures of

the piston and cylinder

0655

If

indicator diagrams

are taken at regular intervals ,any unequal distribution of load

will be easily found out

0990

A

clearly

visible

benefit

of

RT- flex

system

is

smokeless

operation

at

all

ship

speeds.

This is achieved by the superior combustion performance

1006

A

some

and

high-speed

diesel

engines

require

deduction

gear

units

to

provide

a

useful propeller speed . in most reduction gear, the bull

gear is

connection to the propeller

shaft

1011

When

transmitted

by

a

reduction

gear

,

a

diesel

speed

is

reduced

and

the

torque

available for work

is increased

1020

Oil

pressure

in

the

lubrication

is

higher

than

the

static

water

head

to

ensure

that

seawater cannot enter the stern tube in the event of seal failure

1077

In a

fire-tube

boiler the hot gases form the furnace pass through the tubes while the

water is on the outside

1091

A firebox explosion in an automatically fired auxiliary boiler may be the result of

insufficient purging before lighting off.

1095

The water in an auxiliary boiler should be chemically tested daily for alkalinity and

chloride content.

1119.

Improper

maintenance

of

the

fuel

oil

burners

in

an

automatically

fired

auxiliary

boiler, could result in

increased fuel consumption .

1132

Ignition

failure

in

an

automatically

controlled

auxiliary

boiler

could

be

caused

by