competence 4

100問 • 1ヶ月前

問題一覧

In which of the listed components of refrigeration system does a superheating of the refrigerant take place ?

Evaporator

How does the power transfer from the engines located deep inside the hull of a vessel to the propellers at the aft. The answer lies in an integral mechanical component known as

the marine shaft or propeller shaft

An eccentric reducer, used as a transition piece between a centrifugal pump suction flange and the sucion piping flange, must be installed with the eccentric portion below the suction piper centerline to

prevent the formation of air pockets

Faulty operation of diesel engine fuel injection nozzles can be caused by ?

water in the fuel oil supply

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

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

A boiler fuel burner that is equipped with a variable capacity pressure atomizing system function to

provide wide range of combustion

The cooling effect in a refrigeration system is produced by

lowering the pressure of the refrigerant

In order to move the rudder, what must be created by steering gear?

Torque

The ash content of a fuel oil is significant to the operating engineer because ?

it is an indication of the amount of noncombustible material present in the oil

Fuel leakage in high-pressure fuel pipe between the injection pumps and the fuel nozzle needs imeediate repair because of

distortion of the spray pattern

The follow-up mechanism for any steering gear is to assure one rudder position for each corresponding position of the helm. Therefore, the follow-up mechanism should?

be returning the main pump variable stroke device gradually to neutral stroke just as rudder is achieving command angle

At what pressure should a cylinder relief valve of an internal combustion engine be set to relieve?

The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure

What part of the steam assisted atomizer where teh fuel/air mixtures take place ?

mixing chamber

What component is used to thoroughly separate small particle contamination from hydraulic fluid?

Filter

In most horizontally split centrifugal pump casings, wearing rings are prevented from rotating by

using an extended lip formed on one half of the ring and using the upper casing half to trap the lip when the casing is reassembled

What can be found when subjecting a metal to an axial ?

strength

Almost all solenoid valves are actuated by ?

an electromagnet

In a centrifugal pump, the seal piping directs liquid from the discharge side of the pump to the

lantern ring

The range of values around a setpoint of a measured variable where "no action" occurs in an automatic flow controller is called:

Deadband

Component of an engine used to increase scavengin air is called

turbocharger

Through which part of the air register assembly does the largest quantity of air passes through?

Stationary air foil or bladed cone

If the moisture content of air increases, what could happens to the difference between the dry bulb and wet bulb temperature?

It decreases

Slag build up on boiler furnace refractory is undesirable because it causes

peeling or spalling of the brickwork

Operating a rotary gear pump far below its rated speed when handling low viscosity liquids, will cause its volumetric efficiency to ?

decrease to where the pump no longer develops flow

KPa is equivalent to ?

7.5 mm of Hg

Why are air compressors equipped with unloading system ?

removing all but the frictional load during starting

What is the most effective way of detecting any malfunction of machinery during their operation?

Electric siren

Which metal is bolted to the ship's hull to preserved the steel agianst pitting ?

Zinc

Which of the following statement is true if the lube oil temperature is allowed to become excessively high in the heaters?

The lubricant will carbonize and its lubricating ability will be reduced

What is the simplest method used for determining if a centrifugal pump is operating as designed?

close off teh discharge valve, and watch for a rise in pressure

It refers to an internal combustion engine practice, where there is a necessity of heating the oil, to ensure easy flow and good atomization

Pre-heating

Why should a boiler furnace be purged before the burner is lit off?

To clear the furnace of any explosive gases

Maximum rated horsepower of a diesel engine is attained ?

ÀÀ at rated engine RPM

An inadequate reciprocating bilge pump discharge is most often caused by ?

defective intake valves

When installing a new rotary pump, the suction piping should

be atleast one size larger than the pump suction connection

After the installation of new impeller wearing rings by pressing them onto the pump impeller hub, it is advisable to ?

check the shaft and impeller assembly on centers to see if the ring surfaces are true

A diesel engine fails to start due to excessive water in the fuel. Before the engine can be started. the water should be removed from which of the following?

fuel lines

When a burner atomizer is improperly positioned in the distance peice, it may cause ?

oil impingement in the furnace walls

Cylinder wear may take place as a product of mechanical wear, corrosion and combustion which is hard to remove?

adhesion

Why are burner registers to be left open for few minutes when securing burners?

To purge the furnace

In a large slow-speed propulsion diesel engine , the side thrsut on the crosshead is the direct result of ?

the angularity of the connecting rod against the crosshead during the power stroke

Rerigerant is circulated through a refrigeration system by the

compressor

Salinity sell is installed in the distilling unit to indicate the?

quality of water produced

A suitable location for the installation of an impulse type steam trap would be in the?

horizontal run of drain line from the lowest point at the outlet of the heat exchanger

In a refrigeration system how do you clean the oil filter?

pulling out and clean with chemical

Which type of pump is used in the steering gear of modern ships?

Vane

In a flash type distilling unit, which of the following first absorb heat from the evaporator feed?

Distillate cooler

According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?

7 knots

Noise and vibration in a condensate pump would be caused by ?

bent shaft

Provision is to be made for ventilation of an enclosed diesel engine crankcase by means of a small

breather or by means of a slight suction not exceeding 1" of wate

The functional difference between a 2-stroke and a 4-stroke cycle engine is in the numver of ?

piston stroke needed to complete a combustion cycle

A turbocharger is an air compressor driven by ?

engine exhaust gases

Refrigerant is circulated through a refrigeration system by the ?

compressor

For proper combustion where the ratio of fuel oil and air is necessary, the term stoichiometric mixture means?

more fuel, less air

An unloader is intalled on an air compressor to

remove the compression load as the compressor comes up to speed during starting

Settling tanks are part of the fuel oil system used for

heating to allow sediments and water to settle down

Calculate the friction power of the engine with indicated power output of 190 hp and shaft powr of 162 hp

28 hp

Where can you find the refrigerant sight glass of a multi- box refrigeration system?

After the receiver in the liquid line

Short cycling of a refrigeration compressor refers to

frequently starting and stoping

In a diesel engine , an integral liner is one in which the cooling water ____ I. flows through the cylinder liner jackets II. touches the outer side of the liner

flows through the cylinder liner jackets

When an engine coupled with the large vibrational shocks that act on the shaft, and there could be pernmanent damage to the propeller shaft and why ?

Due to intermediate shaft weight

A hydraulic actuator is a device that uses hydraulic energy coming from a hydraulic pump and produce linear mechanical power. What component of the device that produces linear mechanical power ?

Hydraulic cylinder

What will happen toa a diesel engine if air is present in the fuel lines leading to the fuel injection nozzle ?

failure to start

The oil scraper ring of a 4-stroke engine piston is installed at this part ?

Lowest ring

Increases in rotor clearance in a rotary pump will ?

decrease pump cavitation

What will happen if the fuel injected too early in the injection cycle ?

Early detonation and loss of power

In an electro-hydraulic steering gear, any change in relative position between synchronous receiver and the follow-up gear will result in

a corresponding slowing or increasing of the pumped flow rate

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The first shot of chain is painted ?

red on the detachable link and white on each link to either side of the detachable link

Which of the following is the possible cause of fluctuating steam pressure of atomizing steam system is ?

malfunctioning of steam traps in the atomizing steam

One of the main functions of wearing rings, as used in centrifugal pumps, is to

allow ofr economical replacement of worn internal pump components during regular overhaul maintenance

What result will be achieved in maintaining fuel oil temperature properly ?

improved atomization

In a refrigeration system, the amount of refrigerant admitted to the evaporator is directly related to

the superheater of the refrigerant in the tail coil

The degree of fuel atomization in a diesel engine cylinder depends primarily on

the size of the holes in the fuel nozzle

An electric motor failure in an electro-hydraulic steering gear system would cause the rudder to

remain locked in its last position

In a low pressure air compressor, the loss of volumetric efficiency normally results from

heating of the air leaving the cylinders

Carbonization in the surface of the fuel oil heater will reduce the ehating capacity because ?

fluid film covers the surfaces reducing the heat transfer

How is dissolved oxygen in boiler feed water minimized ?

Maintain high feed water temperature

Which of the following components are directly connected to the propellers and lies mainly encased in the stern tube ?

Tail shaft

Proper atomization of fuel in diesel engine combustion chamver will

improve combustion

Which of the following is a function of burner atomizing steam?

impart swirling motion of the oil for efficient combustion

As the pump speed increases, what will happen to NPSH (Net positive suction head)

NPSH increases

The best action to do if the main engine slows down and the cause is not detected immediately is to ?

inform bridge immediately

What is the means of removing the heat of condensation from the refrigerant in a normal refrigerating cycle ?

Condensing the refrigerant in the system condenser

The shaft coupling for the gear pump is prevented from rotating on the shaft by a ?

key

One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is ?

adjustments are not required

After changing out the fuel filters, the diesel engine fails to restart. What could be the probable cause ?

Air bound fuel system

A recirculating , or bleed off line is installed on a centrifugal pump in order to ?

prevent the pump from overheating when operating at shutoff head

What type of pump is used in the steering gear of modern ships?

Vane

An advantage of a helical gear pump ove a simple gear pump is that helical gear pump is capable of ?

producing a smoother discharge flow

If centrifugal pump operating with a positive suction head vibrates, or becomes noisy, the cause could be

insufficient venting

In refrigeration system, the heat normally producing the flash gas at the ghermostatic expansion valve, is obtain from

the portion of liquid refrigerant which does not flash

Prior to departure what preparations are required regarding pistons and cylinder liners of a diesel engine ?

Preheat cylinders and pistons turn engine turn cylinder lubricators

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

Compressor washing

If a leak is suspected in a tue heat exchanger what should be checked FIRST ?

Tightness of flared tube end

Where is the temperature of the refrigerant highest ?

At the compressor discharge

Clearances between the impeller hub and casing of a centrifugal pump are checked with the use of

an accurate set of feeler gages

While making engine room sounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine. This may indicate that the

gland seal leak ooff line is obstructed

As per regulations electric and electro-hydraulic steering gear motors are required to be,

served by two feeder circuits

How does fuel oi atomizers function in boilers?

By breaking fuel oil into a fine spray

100

In a hydraulic system, an O-ring seal will begin to elak when it has lost its interference fit due to which of the following ?

compression set or wear

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問題一覧

In which of the listed components of refrigeration system does a superheating of the refrigerant take place ?

Evaporator

How does the power transfer from the engines located deep inside the hull of a vessel to the propellers at the aft. The answer lies in an integral mechanical component known as

the marine shaft or propeller shaft

prevent the formation of air pockets

Faulty operation of diesel engine fuel injection nozzles can be caused by ?

water in the fuel oil supply

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

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

A boiler fuel burner that is equipped with a variable capacity pressure atomizing system function to

provide wide range of combustion

The cooling effect in a refrigeration system is produced by

lowering the pressure of the refrigerant

In order to move the rudder, what must be created by steering gear?

Torque

The ash content of a fuel oil is significant to the operating engineer because ?

it is an indication of the amount of noncombustible material present in the oil

Fuel leakage in high-pressure fuel pipe between the injection pumps and the fuel nozzle needs imeediate repair because of

distortion of the spray pattern

The follow-up mechanism for any steering gear is to assure one rudder position for each corresponding position of the helm. Therefore, the follow-up mechanism should?

be returning the main pump variable stroke device gradually to neutral stroke just as rudder is achieving command angle

At what pressure should a cylinder relief valve of an internal combustion engine be set to relieve?

The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure

What part of the steam assisted atomizer where teh fuel/air mixtures take place ?

mixing chamber

What component is used to thoroughly separate small particle contamination from hydraulic fluid?

Filter

In most horizontally split centrifugal pump casings, wearing rings are prevented from rotating by

using an extended lip formed on one half of the ring and using the upper casing half to trap the lip when the casing is reassembled

What can be found when subjecting a metal to an axial ?

strength

Almost all solenoid valves are actuated by ?

an electromagnet

In a centrifugal pump, the seal piping directs liquid from the discharge side of the pump to the

lantern ring

The range of values around a setpoint of a measured variable where "no action" occurs in an automatic flow controller is called:

Deadband

Component of an engine used to increase scavengin air is called

turbocharger

Through which part of the air register assembly does the largest quantity of air passes through?

Stationary air foil or bladed cone

If the moisture content of air increases, what could happens to the difference between the dry bulb and wet bulb temperature?

It decreases

Slag build up on boiler furnace refractory is undesirable because it causes

peeling or spalling of the brickwork

Operating a rotary gear pump far below its rated speed when handling low viscosity liquids, will cause its volumetric efficiency to ?

decrease to where the pump no longer develops flow

KPa is equivalent to ?

7.5 mm of Hg

Why are air compressors equipped with unloading system ?

removing all but the frictional load during starting

What is the most effective way of detecting any malfunction of machinery during their operation?

Electric siren

Which metal is bolted to the ship's hull to preserved the steel agianst pitting ?

Zinc

Which of the following statement is true if the lube oil temperature is allowed to become excessively high in the heaters?

The lubricant will carbonize and its lubricating ability will be reduced

What is the simplest method used for determining if a centrifugal pump is operating as designed?

close off teh discharge valve, and watch for a rise in pressure

It refers to an internal combustion engine practice, where there is a necessity of heating the oil, to ensure easy flow and good atomization

Pre-heating

Why should a boiler furnace be purged before the burner is lit off?

To clear the furnace of any explosive gases

Maximum rated horsepower of a diesel engine is attained ?

ÀÀ at rated engine RPM

An inadequate reciprocating bilge pump discharge is most often caused by ?

defective intake valves

When installing a new rotary pump, the suction piping should

be atleast one size larger than the pump suction connection

After the installation of new impeller wearing rings by pressing them onto the pump impeller hub, it is advisable to ?

check the shaft and impeller assembly on centers to see if the ring surfaces are true

A diesel engine fails to start due to excessive water in the fuel. Before the engine can be started. the water should be removed from which of the following?

fuel lines

When a burner atomizer is improperly positioned in the distance peice, it may cause ?

oil impingement in the furnace walls

Cylinder wear may take place as a product of mechanical wear, corrosion and combustion which is hard to remove?

adhesion

Why are burner registers to be left open for few minutes when securing burners?

To purge the furnace

In a large slow-speed propulsion diesel engine , the side thrsut on the crosshead is the direct result of ?

the angularity of the connecting rod against the crosshead during the power stroke

Rerigerant is circulated through a refrigeration system by the

compressor

Salinity sell is installed in the distilling unit to indicate the?

quality of water produced

A suitable location for the installation of an impulse type steam trap would be in the?

horizontal run of drain line from the lowest point at the outlet of the heat exchanger

In a refrigeration system how do you clean the oil filter?

pulling out and clean with chemical

Which type of pump is used in the steering gear of modern ships?

Vane

In a flash type distilling unit, which of the following first absorb heat from the evaporator feed?

Distillate cooler

7 knots

Noise and vibration in a condensate pump would be caused by ?

bent shaft

Provision is to be made for ventilation of an enclosed diesel engine crankcase by means of a small

breather or by means of a slight suction not exceeding 1" of wate

The functional difference between a 2-stroke and a 4-stroke cycle engine is in the numver of ?

piston stroke needed to complete a combustion cycle

A turbocharger is an air compressor driven by ?

engine exhaust gases

Refrigerant is circulated through a refrigeration system by the ?

compressor

For proper combustion where the ratio of fuel oil and air is necessary, the term stoichiometric mixture means?

more fuel, less air

An unloader is intalled on an air compressor to

remove the compression load as the compressor comes up to speed during starting

Settling tanks are part of the fuel oil system used for

heating to allow sediments and water to settle down

Calculate the friction power of the engine with indicated power output of 190 hp and shaft powr of 162 hp

28 hp

Where can you find the refrigerant sight glass of a multi- box refrigeration system?

After the receiver in the liquid line

Short cycling of a refrigeration compressor refers to

frequently starting and stoping

In a diesel engine , an integral liner is one in which the cooling water ____ I. flows through the cylinder liner jackets II. touches the outer side of the liner

flows through the cylinder liner jackets

When an engine coupled with the large vibrational shocks that act on the shaft, and there could be pernmanent damage to the propeller shaft and why ?

Due to intermediate shaft weight

A hydraulic actuator is a device that uses hydraulic energy coming from a hydraulic pump and produce linear mechanical power. What component of the device that produces linear mechanical power ?

Hydraulic cylinder

What will happen toa a diesel engine if air is present in the fuel lines leading to the fuel injection nozzle ?

failure to start

The oil scraper ring of a 4-stroke engine piston is installed at this part ?

Lowest ring

Increases in rotor clearance in a rotary pump will ?

decrease pump cavitation

What will happen if the fuel injected too early in the injection cycle ?

Early detonation and loss of power

In an electro-hydraulic steering gear, any change in relative position between synchronous receiver and the follow-up gear will result in

a corresponding slowing or increasing of the pumped flow rate

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The first shot of chain is painted ?

red on the detachable link and white on each link to either side of the detachable link

Which of the following is the possible cause of fluctuating steam pressure of atomizing steam system is ?

malfunctioning of steam traps in the atomizing steam

One of the main functions of wearing rings, as used in centrifugal pumps, is to

allow ofr economical replacement of worn internal pump components during regular overhaul maintenance

What result will be achieved in maintaining fuel oil temperature properly ?

improved atomization

In a refrigeration system, the amount of refrigerant admitted to the evaporator is directly related to

the superheater of the refrigerant in the tail coil

The degree of fuel atomization in a diesel engine cylinder depends primarily on

the size of the holes in the fuel nozzle

An electric motor failure in an electro-hydraulic steering gear system would cause the rudder to

remain locked in its last position

In a low pressure air compressor, the loss of volumetric efficiency normally results from

heating of the air leaving the cylinders

Carbonization in the surface of the fuel oil heater will reduce the ehating capacity because ?

fluid film covers the surfaces reducing the heat transfer

How is dissolved oxygen in boiler feed water minimized ?

Maintain high feed water temperature

Which of the following components are directly connected to the propellers and lies mainly encased in the stern tube ?

Tail shaft

Proper atomization of fuel in diesel engine combustion chamver will

improve combustion

Which of the following is a function of burner atomizing steam?

impart swirling motion of the oil for efficient combustion

As the pump speed increases, what will happen to NPSH (Net positive suction head)

NPSH increases

The best action to do if the main engine slows down and the cause is not detected immediately is to ?

inform bridge immediately

What is the means of removing the heat of condensation from the refrigerant in a normal refrigerating cycle ?

Condensing the refrigerant in the system condenser

The shaft coupling for the gear pump is prevented from rotating on the shaft by a ?

key

One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is ?

adjustments are not required

After changing out the fuel filters, the diesel engine fails to restart. What could be the probable cause ?

Air bound fuel system

A recirculating , or bleed off line is installed on a centrifugal pump in order to ?

prevent the pump from overheating when operating at shutoff head

What type of pump is used in the steering gear of modern ships?

Vane

An advantage of a helical gear pump ove a simple gear pump is that helical gear pump is capable of ?

producing a smoother discharge flow

If centrifugal pump operating with a positive suction head vibrates, or becomes noisy, the cause could be

insufficient venting

In refrigeration system, the heat normally producing the flash gas at the ghermostatic expansion valve, is obtain from

the portion of liquid refrigerant which does not flash

Prior to departure what preparations are required regarding pistons and cylinder liners of a diesel engine ?

Preheat cylinders and pistons turn engine turn cylinder lubricators

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

Compressor washing

If a leak is suspected in a tue heat exchanger what should be checked FIRST ?

Tightness of flared tube end

Where is the temperature of the refrigerant highest ?

At the compressor discharge

Clearances between the impeller hub and casing of a centrifugal pump are checked with the use of

an accurate set of feeler gages

While making engine room sounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine. This may indicate that the

gland seal leak ooff line is obstructed

As per regulations electric and electro-hydraulic steering gear motors are required to be,

served by two feeder circuits

How does fuel oi atomizers function in boilers?

By breaking fuel oil into a fine spray

100

In a hydraulic system, an O-ring seal will begin to elak when it has lost its interference fit due to which of the following ?

compression set or wear