COMPETENCE 9

50問 • 2年前

Peter j Zuniega

通報

問題一覧

A fixed displacement pump is a hydraulic pump in which the________.

discharge capacity is constant

The following are parts of the main bowl of purifier except___________.

bolt

In hydraulic system, all machines which are consumers of hydraulic power equipped with ________.

motor

Which of the following statements concerning braze welding is/are correct?

Braze welding is an exceptionally good method of repairing malleable (special heattreated) iron

Which of the following statements concerning braze welding is/are correct?

Braze welding is an acceptable method of repairing malleable iron and mild steel

If the intercooler relief valve lifts while an air compressor is operating under load, you should check for _____.

leaking high pressure discharge valves

Acetylene should never be used at pressures in excess of 15 psig because the _____.

slightest shock could cause an explosion

The tool used to makeup connection fittings for small diameter copper tubing is called a/an _____.

flaring tool

If a small auxiliary diesel engine will not crank but can be barred over, the trouble may be due to _________.

Corrosion of starting battery terminal connections

You should never watch the arc generated during electric arc welder with the naked eye because _____.

serious flash burns will result

When a waste heat boiler is installed in the exhaust gas bypass would be used _____.

at low loads to prevent corrosion in the boiler

An exhaust gas bypass is installed on a waste heat boiler in order to ______.

minimize moisture condensation in the boiler gas passages at low loads

Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?

faulty operation of a cylinder unloader

If the drive belts on an air compressor were squealing during start up, you should _____.

check the operation of the unloaders

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

exhaust gases at various locations

Flux is used when soldering, in order to _____.

decrease the surface tension of the solder

A dirty intercooler inn the ship service air compressor will result in _____.

higher than normal power consumption

Protective equipment to be used while carrying out oxy‐acetylene welding should always include _____.

tinted goggles

Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _________.

definer or viscous fluid damper

The leaking valves in a low pressure, reciprocating, air compressor can result from _____.

abrasion by dust and dirt

Black smoke exhausting from a diesel engine may be caused by ______.

a clogged air cleaner

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

mechanical failure in the unloader

White smoke exhausting from a diesel engine can be caused by a _______.

cracked cylinder liner

Combustion knock occurring in a diesel engine can be caused by ______.

Low coolant temperature

If a diesel engine is smoking excessively under load, the cause could be ________.

plugged injector holes

Which of the following statements is correct concerning welding sequences?

First, weld the joints that will tend to contract the most.

In certain circumstances, weldments are preheated before each pass to _____.

reduce internal stresses

Excessive lube oil consumption by a reciprocating air compressor can be caused by _____.

carrying the oil level higher than normal

When welding or burning with an oxy‐acetylene torch, _____.

never allow more than 15 PSIG pressure in the acetylene hose

If an electric motor driven air compressor fails to start, it may be due to a _____.

tripped overload relay

The loss of a diesel engine cylinder air charge through leaky valves, pistons rings, worn or scored liners, would be indicated by which of the following sets of exhaust of conditions?

Low compression pressure and high exhaust temperature

4/3 Way valve is a type of directional valve with ___________

4 ports and 3 positions

A welding procedure used for joining dissimilar metals used in the construction of a MODU would be recorded in the

welding plan

Which of the following will speed up the recovery process when performing maintenance on a refrigeration system _______?

chilling the recovery vessel and heating the appliance

An aligning punch is used to_______________

line up corresponding holes in adjacent parts

What factors shorten the life of valve springs?

Fatigue and compression

Which of the fittings listed should be used for the installation of piping to permit removal of the pump for servicing?

Union

Expansion valve maintenance should include which of the following procedures?

Ensuring that the thermal bulb is in good contact with the suction line

A dial indicator is used to measure________.

shaft eccentricity

Important check to be done during overhauling of the pump is the______.

wear ring clearance against impeller

An oil film of a lubricant is affected by the______.

working temperature of the engine

Engine operating conditions may be indicated by the color of the exhaust smoke. Black smoke could indicate ________.

an overloaded engine

A reciprocating air compressor is running roughly and vibrating excessively, indicating that the _____.

foundation bolts are loose

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

reduce oxidation

In order to minimize distortion in a weldment due to shrinkage, you should _____. I. use intermittent welds rather than continuous welds wherever possible II. make fewer passes with large electrodes as opposed to many passes with small electrodes III. use

I, II & III

A flare‐type tubing connector is used in the hydraulic hatch-cover system and has developed a slight leak. To stop the leak you should __________.

shut down the power unit and use two wrenches to avoid damaging the tubing when tightening

If the electric motor driving an air compressor fails to start, the cause may be a _____.

tripped circuit breaker

The nut of the bowl assembly is confirmed tight___________.

when marks on the body and nut are aligned

The size of flexible hose used in a hydraulic system is indicated by______________.

the numerical designation found on the 'skin' of the hose

Good maintenance is decisive and best be achieved in the engine room if there is________________.

high degree of safety

COMPETENCE 1