competenence 9

100問 • 2ヶ月前

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問題一覧

In a closed cooling system for a turbocharged four stroke diesel engine, fluctuating water pressure can be caused by ?

an incorrectly set cooling system pressuer control

To properly use a tube expander, the expander should be placed in the tube to be rolled so that the

rollers bear on the portion of the tube which in the tube sheet

During the operation of a lube oil centrifuge, a thin emulsion interface occurs between the lube oil and sea. The position of this interface is determined by the

inside diameter of the ring dam

Which characteristic or condition will have the greatest effect on increasing a hydraulic oil as viscosity?

pressure

fusible link fire dampers are operated by

the heat of a fire melting the link

The measure gap between the face of the burner atomizer tip nut and the diffuser plate, is determined by the setting of the

distance piece

Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?

Deterioration of paints, seals, metals, and electrical insulation may occur

If the hydraulic governor has been drained and refilled with fresh oil, the engine should be operated until it reaches normal temperature, then the air should be purged by

compensating needle valve adjusted by stability

Which pressure in an operating hydraulic system is developed

by resistance to the fluid flow through the system

Low scavenging pressure delivered to the engine can cause ?

High exhaust temperature in all cylinder

When the pressuer on a compound gage is released, the gage pointer is returned to zero psig by action of the

bourdon tube

Which of the following material has high tensile strenght and corrosion resistance and has been used to replace steel metal in both flat plate form and in matched-metal die processes where parts are molded in the performed shape?

Titanium

For any piston ring to perate smoothly without scuffing, the ring must be?

lubricated properly during engine operation

Diesel engine starting difficulties due to cold intake air temperature, can be overcome by using alan?

jacket water heater

Acetylene should never be used at pressure in excess of 15 psig because the ?

slightest backfire could cause and explosion

The insertion of shims between the foot oaf a marine type connecting rod and a bearing box would result in

increased compression ratio

Leakage of hydraulic fluif from around the shaft of a hydraulic motor can may be caused by

Worn shaft seals

When conducting a routine hydrostatic test on a water-tube boiler, you should,

have gags installed on all safety valve

What do you call the portion of a hydraulic hose that determines its overall strength ?

braided inner layers

Why is a hydraulic liner actuator fitted with a cushioning device?

To slow the action of the piston preventing shock and damage due to hammering effects.

The ventilation system aboardships has fire dampers restrained by fusible links that will?

need replacement if the damper remain closed

Which of the following centrifugal pump components converts the liquid kinetic energy to velocity to the potential energy of pressure?

Volute

What is the used of jacking gear on main propulsion turbines?

provide complete gear tooth inspection

What is the possible cause why a lube oil pump fail to build up discharge pressure ?

Suction valve is closed

What is caused by restriction occuring in the small orifices of pneumatic control system components?

Moisture in the compressed air supply

Which of the following problems occuring in a hydraulic system can be caused by using an oil having a viscosity lower than specified?

Increased wear of moving parts

A work piece has been mounted between centers and a test cut machined at each end to check alignment of the lathe center. If the test cut on the tailstock end is deeper than the test cut on the headstock end, the tailstock must be moved?

away from you to correct alignment

Which of the following is the proper maintenance for a lube oil pump?

Inspect the telltale holes for leakage

Which of the following is true concerning the hose threads on compressed gas oxy-acetylene regulators and torches ?

The torch oxygen inlet hose thread connection is "righ" handed

Modern trends show that the full flow filters used in multi-operation system would most likely be located?

in the reservoir return line

In order to install piping easier and to facilitate and disconnect the pump for servicing , which of the following fitting should be used?

Quick disconnect coupling

Which of the factors listed governs the intensity of heat required for any given welding job?

The type of metal being joined and the welding process used

Which internal combustion engine starting system uses a vane type fluid motor?

Compressed air

In a certain cases, a cylinder liner can be refinished rather than replaced. When properly honed, the ?

liner surface should have a crosshatch pattern

What will be the effect of obstructed suction passages in the casing or pintle of a radial piston hydraulic pump?

Pumped fluid volume to decrease

If the hydraulic governor has been drained and refilled with fresh oil, the engien should be operated until it reaches normal temperature, then the air should be purged by ?

compensating needle valve adjusted for stability

The purpose of the diffuser in a boiler burner assembly is to

shield the flame from the incoming air blast while allowing some mixing of fuel and air

What would you do after adding grease to a ball bearing with a hand held grease gun?

Run the machine with the bearing housing drain plug open for a short while

In the case of variable speed centrifugal pump?

capacity varies directly as the speed

What can cause dirt in a fuel oil system to the diesel engine?

Injector damage

Why should a return lines in a non-pressurized hydraulic system reservoir enter the tank well below the fluid surface level?

Prevent foaming

How can teh leak in a hydraulic system in a hatch cover be remedied?

Shut down the power unit and use two wrenches to avoid damaging the tube when tightening

Which ring dam arrangement should be used for centrifugal purification?

The largest inside diameter ring without loss of oil

The large number of mechanical and pulsating vibrations developed in a diesel engien may damage an attached?

gas driven turbocharger because it has wide range and high temperature materials that are subject to resonant vibration

What is a one common cause of cylinder liner wear?

Burning heavy fuel oil with signifanct amount of sulphur

On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measure by using alan

bridge gauge

Abnormal crankpin bearing and piston skirt surface wear indicate a?

incorrect connecting rod alignment

Which of the listed interlocks stops the valve in the remote operating valve line of air starting system from opening?

Turning gear

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this effect the steaming boiler?

The steam pressure rise

The ignition quality of a fuel oil is an important operational consideration because it ?

affects the starting ability of a cold engine

What will happen if a diesel engine is running in about to dry fuel oil day tank?

air in the fuel system

With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the ?

ignition quality of the fuel

Which of the following is the proper maintenance for a lube oil pump?

inspect teh telltail holes for leakage

If teh intercooler of a low-pressure air compressor becomes fouled either internally or externally, what will happen?

volumetric efficiency will be decreased

Thermocouple pyrometers are sued on large, main propulsion diesel engines to indicate the temperature of the

Exhaust gases at various locations

Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?

Decreased compression ratio

Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of ?

ÀÀ low hydraulic oil viscosity

Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the

exhaust gases at various locations

Worn main bearings will cause the compression ratio of an auxiliary diesel engine to?

decrease

After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal ?

12000 hours

While your standing your engine room watch at sea, you notice the D.C heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?

Open the make-up feed valve bypass and check the condenser level immediately

Too high exhaust gas temperature in all cylinders is cause by the following except?

stuck-up fuel injection pump

Putting additives into diesel engine cooling water is primarily designed to prevent?

scaling

An advantage of aluminum pistons, when compared to cast iron piston is ?

better heat conductivity

With an increase in temperature, the volume of hydraulic oil

increases

When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the ?

Bourdon tube

What is the fusion of two metals joined together to produce a strong bind as one metal ?

Welding

When arc welding, the flux that covers the electrode is used to

reduce oxidation

Which of the following statements concerning cylinder liner wear in a single acting diesel engine is coorect ?

Excessive liner wear causes wear between piston rings and grooves

What is caused by restrictions occuring in the small orifices of pneumatic control system components?

Moisture in the compressed air supply

Some fluid filters used in hydraulic systems are designed to cope with increasing pressure differential by ?

automically bypassing the fluid via an internal valve arrangement

What do you call a component used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid?

Filter

Below are some of the causes of high exhaust gas temperature except?

poor quality of fuel oil

The longer the ignition delay period resulting from improper use to low cetane fuel, the ?

more rapid the rise in combustion pressure

A roller bearing should normally be filled to what fraction of its space cavity ?

1/3 to 1/2

A properly honed diesel engine cylinder liner will ?

shorten the ring breaik-in period

What size of the circular bar is required to make a hexagonal nut of 16mm sides?

16mm

When normal operating pressure is applied to the hydraulic oil in a high pressure system, the oil ?

viscosity will increase

Which of the listed devices is often clutched to the flywheel of small and medium size diesel engines for the purpose of starting?

Air motor

The best way to recondition a defective fuel injector is ?

send to the neasrest authorized repiar

Which of the following refers to the distance between the piston top BDC and TDC ?

The stroke

The tool used to make up connection fittings for small diameter copper tubing is called alan

flaring tool

What is the principal or main hazard to personnel when a diesel nozzle tester is in use?

Blood poisoning

The insulation and screen of diesel engine exhaust manifold should be put back after each overhaul because it ?

protects engine personnel from burns due to accidental contact

What is the complete tool used for manually cutting threads on pipe?

stock and die

Which one of the following tool used in precision work to smooth or enlarge a slightly undersized hole?

reamer

What power is required in maintaining the hydraulic consumer system?

motor

An acceptable method of temporary repairs in teh vessels hull is ?

doubler-plater to be pitted

What type of fits in necessary in the assembly of mating parts with the use of hydraulic press?

interference fits

Hydraulic system reservoir are often fitted with a combined filler/breather cap. What is the effect of a fouled breather element?

Reservoir is subjected to a partial vaccum

What care and attention should be maintained in a hydraulic system after installing a new hydraulic pump in it?

The filters and strainers should be checked frequently

Where is the charge for an air starting system stored?

Pressurized tank

What type of hydraulic pumps most commonly used in steering systems?

volute type

High jacket cooling water temperature for all cylinder is caused by?

overload engine

An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to ?

compression set or wear

A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high?

first stage discharge pressure

If during operation and the air compressor pressure will not raise, the probable cause maybe?

clogged suction air filter

To determine the main bearing clearance of a propulsion diesel engine , you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using alan

outside micrometer

Automatic control valves for steam service require periodic maintenance inspection because they

continously throttle steam resulting in wire drawing and erosion of the valve

100

Where does the generator cooling wter comes from during dry-docking?

culating fore or aft peak tank

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問題一覧

In a closed cooling system for a turbocharged four stroke diesel engine, fluctuating water pressure can be caused by ?

an incorrectly set cooling system pressuer control

To properly use a tube expander, the expander should be placed in the tube to be rolled so that the

rollers bear on the portion of the tube which in the tube sheet

During the operation of a lube oil centrifuge, a thin emulsion interface occurs between the lube oil and sea. The position of this interface is determined by the

inside diameter of the ring dam

Which characteristic or condition will have the greatest effect on increasing a hydraulic oil as viscosity?

pressure

fusible link fire dampers are operated by

the heat of a fire melting the link

The measure gap between the face of the burner atomizer tip nut and the diffuser plate, is determined by the setting of the

distance piece

Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?

Deterioration of paints, seals, metals, and electrical insulation may occur

If the hydraulic governor has been drained and refilled with fresh oil, the engine should be operated until it reaches normal temperature, then the air should be purged by

compensating needle valve adjusted by stability

Which pressure in an operating hydraulic system is developed

by resistance to the fluid flow through the system

Low scavenging pressure delivered to the engine can cause ?

High exhaust temperature in all cylinder

When the pressuer on a compound gage is released, the gage pointer is returned to zero psig by action of the

bourdon tube

Titanium

For any piston ring to perate smoothly without scuffing, the ring must be?

lubricated properly during engine operation

Diesel engine starting difficulties due to cold intake air temperature, can be overcome by using alan?

jacket water heater

Acetylene should never be used at pressure in excess of 15 psig because the ?

slightest backfire could cause and explosion

The insertion of shims between the foot oaf a marine type connecting rod and a bearing box would result in

increased compression ratio

Leakage of hydraulic fluif from around the shaft of a hydraulic motor can may be caused by

Worn shaft seals

When conducting a routine hydrostatic test on a water-tube boiler, you should,

have gags installed on all safety valve

What do you call the portion of a hydraulic hose that determines its overall strength ?

braided inner layers

Why is a hydraulic liner actuator fitted with a cushioning device?

To slow the action of the piston preventing shock and damage due to hammering effects.

The ventilation system aboardships has fire dampers restrained by fusible links that will?

need replacement if the damper remain closed

Which of the following centrifugal pump components converts the liquid kinetic energy to velocity to the potential energy of pressure?

Volute

What is the used of jacking gear on main propulsion turbines?

provide complete gear tooth inspection

What is the possible cause why a lube oil pump fail to build up discharge pressure ?

Suction valve is closed

What is caused by restriction occuring in the small orifices of pneumatic control system components?

Moisture in the compressed air supply

Which of the following problems occuring in a hydraulic system can be caused by using an oil having a viscosity lower than specified?

Increased wear of moving parts

away from you to correct alignment

Which of the following is the proper maintenance for a lube oil pump?

Inspect the telltale holes for leakage

Which of the following is true concerning the hose threads on compressed gas oxy-acetylene regulators and torches ?

The torch oxygen inlet hose thread connection is "righ" handed

Modern trends show that the full flow filters used in multi-operation system would most likely be located?

in the reservoir return line

In order to install piping easier and to facilitate and disconnect the pump for servicing , which of the following fitting should be used?

Quick disconnect coupling

Which of the factors listed governs the intensity of heat required for any given welding job?

The type of metal being joined and the welding process used

Which internal combustion engine starting system uses a vane type fluid motor?

Compressed air

In a certain cases, a cylinder liner can be refinished rather than replaced. When properly honed, the ?

liner surface should have a crosshatch pattern

What will be the effect of obstructed suction passages in the casing or pintle of a radial piston hydraulic pump?

Pumped fluid volume to decrease

If the hydraulic governor has been drained and refilled with fresh oil, the engien should be operated until it reaches normal temperature, then the air should be purged by ?

compensating needle valve adjusted for stability

The purpose of the diffuser in a boiler burner assembly is to

shield the flame from the incoming air blast while allowing some mixing of fuel and air

What would you do after adding grease to a ball bearing with a hand held grease gun?

Run the machine with the bearing housing drain plug open for a short while

In the case of variable speed centrifugal pump?

capacity varies directly as the speed

What can cause dirt in a fuel oil system to the diesel engine?

Injector damage

Why should a return lines in a non-pressurized hydraulic system reservoir enter the tank well below the fluid surface level?

Prevent foaming

How can teh leak in a hydraulic system in a hatch cover be remedied?

Shut down the power unit and use two wrenches to avoid damaging the tube when tightening

Which ring dam arrangement should be used for centrifugal purification?

The largest inside diameter ring without loss of oil

The large number of mechanical and pulsating vibrations developed in a diesel engien may damage an attached?

gas driven turbocharger because it has wide range and high temperature materials that are subject to resonant vibration

What is a one common cause of cylinder liner wear?

Burning heavy fuel oil with signifanct amount of sulphur

On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measure by using alan

bridge gauge

Abnormal crankpin bearing and piston skirt surface wear indicate a?

incorrect connecting rod alignment

Which of the listed interlocks stops the valve in the remote operating valve line of air starting system from opening?

Turning gear

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this effect the steaming boiler?

The steam pressure rise

The ignition quality of a fuel oil is an important operational consideration because it ?

affects the starting ability of a cold engine

What will happen if a diesel engine is running in about to dry fuel oil day tank?

air in the fuel system

With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the ?

ignition quality of the fuel

Which of the following is the proper maintenance for a lube oil pump?

inspect teh telltail holes for leakage

If teh intercooler of a low-pressure air compressor becomes fouled either internally or externally, what will happen?

volumetric efficiency will be decreased

Thermocouple pyrometers are sued on large, main propulsion diesel engines to indicate the temperature of the

Exhaust gases at various locations

Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?

Decreased compression ratio

Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of ?

ÀÀ low hydraulic oil viscosity

Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the

exhaust gases at various locations

Worn main bearings will cause the compression ratio of an auxiliary diesel engine to?

decrease

After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal ?

12000 hours

While your standing your engine room watch at sea, you notice the D.C heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?

Open the make-up feed valve bypass and check the condenser level immediately

Too high exhaust gas temperature in all cylinders is cause by the following except?

stuck-up fuel injection pump

Putting additives into diesel engine cooling water is primarily designed to prevent?

scaling

An advantage of aluminum pistons, when compared to cast iron piston is ?

better heat conductivity

With an increase in temperature, the volume of hydraulic oil

increases

When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the ?

Bourdon tube

What is the fusion of two metals joined together to produce a strong bind as one metal ?

Welding

When arc welding, the flux that covers the electrode is used to

reduce oxidation

Which of the following statements concerning cylinder liner wear in a single acting diesel engine is coorect ?

Excessive liner wear causes wear between piston rings and grooves

What is caused by restrictions occuring in the small orifices of pneumatic control system components?

Moisture in the compressed air supply

Some fluid filters used in hydraulic systems are designed to cope with increasing pressure differential by ?

automically bypassing the fluid via an internal valve arrangement

What do you call a component used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid?

Filter

Below are some of the causes of high exhaust gas temperature except?

poor quality of fuel oil

The longer the ignition delay period resulting from improper use to low cetane fuel, the ?

more rapid the rise in combustion pressure

A roller bearing should normally be filled to what fraction of its space cavity ?

1/3 to 1/2

A properly honed diesel engine cylinder liner will ?

shorten the ring breaik-in period

What size of the circular bar is required to make a hexagonal nut of 16mm sides?

16mm

When normal operating pressure is applied to the hydraulic oil in a high pressure system, the oil ?

viscosity will increase

Which of the listed devices is often clutched to the flywheel of small and medium size diesel engines for the purpose of starting?

Air motor

The best way to recondition a defective fuel injector is ?

send to the neasrest authorized repiar

Which of the following refers to the distance between the piston top BDC and TDC ?

The stroke

The tool used to make up connection fittings for small diameter copper tubing is called alan

flaring tool

What is the principal or main hazard to personnel when a diesel nozzle tester is in use?

Blood poisoning

The insulation and screen of diesel engine exhaust manifold should be put back after each overhaul because it ?

protects engine personnel from burns due to accidental contact

What is the complete tool used for manually cutting threads on pipe?

stock and die

Which one of the following tool used in precision work to smooth or enlarge a slightly undersized hole?

reamer

What power is required in maintaining the hydraulic consumer system?

motor

An acceptable method of temporary repairs in teh vessels hull is ?

doubler-plater to be pitted

What type of fits in necessary in the assembly of mating parts with the use of hydraulic press?

interference fits

Hydraulic system reservoir are often fitted with a combined filler/breather cap. What is the effect of a fouled breather element?

Reservoir is subjected to a partial vaccum

What care and attention should be maintained in a hydraulic system after installing a new hydraulic pump in it?

The filters and strainers should be checked frequently

Where is the charge for an air starting system stored?

Pressurized tank

What type of hydraulic pumps most commonly used in steering systems?

volute type

High jacket cooling water temperature for all cylinder is caused by?

overload engine

An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to ?

compression set or wear

A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high?

first stage discharge pressure

If during operation and the air compressor pressure will not raise, the probable cause maybe?

clogged suction air filter

To determine the main bearing clearance of a propulsion diesel engine , you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using alan

outside micrometer

Automatic control valves for steam service require periodic maintenance inspection because they

continously throttle steam resulting in wire drawing and erosion of the valve

100

Where does the generator cooling wter comes from during dry-docking?

culating fore or aft peak tank