competence 8

82問 • 12ヶ月前

問題一覧

What do you call that instrument use to take misalignment of the crankshaft?

Deflection gauge

The lower water seal on a diesel engine wet cylinder liner must allow for liner expansion and contraction. This seal is most commonly a

neoprene O-ring

What procedure must be formed before doing any maintenance on a hydraulic system, i.e. there is still stored energy in the accumulator?

Bleed off the energy stored in the accumulator

What is the purpose of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the melting point, then cooling it, usually in air ?

tempering

When the object you are cutting using a hand hacksaw is about to separate, how should you handle the hand hacksaw?

Reduce cutting speed and pressure

Safety valve gags should only be installed hand tight in order to prevent

bending of the valve stem

What is commonly used by a machinist and repairman in fixing files with coarsely teeth?

Bastard cut

When saw blades are fixed in a hand-held hacksaw frame, which of the following can move forward and reverse stroke ?

Rod

Which non-ferous alloy is most commonly used for heat exchanger tubes and possesses a high resistance to corrosion ?

copper nickel

Which of the listed devices could be used as a ring groove cleaning tool during preparation for the installation of new rings if a piston ring cleaning tool was not available?

A section of the removed compression ring

What should you avoid increased pressure on a drill as the drill point begins to break through the bottom of the work piece?

Determine the exerted pressure by watching the pressure gauge

Which one of the list should a flat chisel is the proper tools used for cutting?

flat stock

Tubing is sized by:

nominal outside diameter

Which of the listed metals can usually be drilled without lubrication?

brass

Which of the following process will a hacksaw blade start a cut more easily ?

file a eick where the cut is to be started

Which of the following method listed would be most effective in repairing a steam cut on a seating surface of super heater hand hole plate?

Filling the cut by welding and then grinding it smooth

A pump shaft that is bent or distorted should normally

replaced with satisfactory spare

A hard brittle substance that are insoluble in water is called?

resin

Which of the following files having coarsely spaced teeth?

Bastard cut

Why should two pipe joints be properly align before being connected?

Misalignment of the joints will result to excessive strain

The drill size is marked on the ?

shank

Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For this purpose, Which of the following steam system is used?

Gland sealing steam system

What tool is mainly used in cutting metals?

Hacksawing

Which of the following is the property of material that enables it to resist strain when stress is applied ?

Strength

When drilling holes in a piece of work chuked in a lathe, where does you should mount the drill chuck?

tailstock

In electric arc welding, what purpose does the electrode coating serve?

it provided a gas shield

This method is used for joining sheet metal and for attaching studs, rods and busses, etc. to plates

resistance welding

Which of these metals can be drileld without lubrication ?

Brass

When tightening the nozzle nut of fuel injector, which of the following tools is used ?

Torque Wrench

If you suspect that a gage is sticking and giving an inaccurate reading, you should

replace the gage or have it calibrated

In general practice, which one makes common measurements on circular and curved surfaces in machine shops?

spherical

Heat damage to fuel injection nozzles on small high-spped diesel engines can be prevented by

ensuring good metallic contact between nozzles and cylinder heads

A crack, located in the shell plating or deck plating of a ship, may be temporarily weld repair from increasing in length by.

drilling a hole at each end of the crack and weld

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

liner surface should have a crosshatch pattern

Which of one of the following measured with a pyrometer ?

Temperature

Which is the best indicator that a bearing is being properly lubricated ?

oil temperature indicated by the bearing thermometer

What do you call the operation of machining a uniformly roughened or checked surface on round stock in a lathe?

knurling

A dial indicator is used to measure?

shaft eccentricity

What tools has to be used for enlarging a hole after drilling operation?

Countersinking tool

During routine maintenance inspection of a centrifugal pump, scoring on a pump shaft sleeve is detected. Which of the following action should be taken?

Correct the cause of the scoring and repair the sleeve or replace with a new one

Which of the listed metals can usually be drilled without lubrication?

Brass

Which of the listed types of gasket material should be used on high pressure fuel oil lines in a diesel engine?

Sheet asbestos

What happen if steel is tempered ?

less brittle

Heat is defined as ?

thermal energy in transition

What tool has to be used for enlarging a hole after a drilling operation?

Countersinking tool

Which method is often used to detect external defects in welded metals?

Visible dye penetrant

To avoid deformation when cutting thin sheet metal while using ahandheld hacksaw, it should be placed between two

blocks of wood

When a lathe is used for threading cutting, which determines the number of threads per inch produced by the lathe speed ?

lead screw and head stock spindle

Kinetic energy is associated with?

movement and relative velocity

Babbit is a metal alloy commonly used as the lining for?

bearing

When using a hand held hacksaw the correct maximum rate of speed for cutting should be

40 to 50 strokes per minute

Labyrinth seals used to reduce leakage around a turbine shaft are constructed of

machined packing strips or fins

An acceptable method of temporary repairs in the vessel hull is

double-plater to be fitted

Before boring a blind tapered hole, a good shop practice to follow is

drill to the small diameter

What fitting is deal for connecting pipes with big diameters of equal length?

Union

To minimize corrosion, fuel oil strainer disks spacers blades are made of

monel metal or stainless steel

In order to prevent overheating of the packing in the stern tube stuffing box

the gland is properly adjusted to permit a slight leakage of sea water

Rubber o-ring has an inside and outside diamter of 64mm and 74mm respectively, which of the following best describes the O-ring?

the oring will fit to a 10mm x9 mm deep grove

The gaskets and the broken studs have been replace on a t ank manhole cover. Which of the following methods is satisfactory for testing the repair ?

Hose test the repaired area with a minimum of 100 psig water pressure

When copper plates are used for making gaskets, it is usually annealed by heating red cherry color, what is the complete process?

cooling slowly in air

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

Welding

What type of file will produce a fine finish when draw filing ?

mill cut

If the drill point lips are ground at different angles, the drill will ?

Cut an oversized hole

To safety remove the piston rod packing from the steam end of a reciprocating pump, you should

use a packing hook

Duting cutting in milling the chips begin to produce long and continous, it is best that the feed is

away from you to correct alignment

When using centre lathe, why should you use short sleeves or close fitting sleeves be worn?

to prevent sleeves being caught up on work piece or chuck

Which of the following problems is the main source of fuel pump and injection system malfunctions?

Air in the fuel system

Anti freeze solution containing ethylene glycol, should not be mixed with corrosion protection oils, as the resultant mixture ?

may cause frothing

What is inert gas use as shielded gas in MIG and TIG welding?

argon

If you are cutting external threads by hand and you start the die at an angle, what will happen to the external threads?

it will be cut crooked on the work

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

Compression set of wear

Which of the following propeller materials will not require stress relief treatment after minor repairs, straightening of the tips or the thinning of the blade edges?

Nickel aluminum bronze

What operation can be done during external cleaning of boiler tubes in order to prevent the accumulation of carbon deposits?

sootblowing

What is the terms rough, coarse, bastard, second cut smooth and dead smooth refer to ?

distance between the parallel cuts on the file

Boyle's low can best be defined as ?

The volume of an enclosed gas varies inversely with the applied pressure provided the temperature remain constant

A pressure gauge pointer responding sliggishly to changes in pressure, should be repaired by

cleaning the residue from gear teeth

What do you call a lathe dog fitted with a headless set screw?

safety lathe dog

A follower rest should make use of a lathe to machine ?

threads on long slender shafts

Why must a close fitting, buttoned up overall be worn using a lathe?

to avoid catching on the tool post

Which material can be drilled at the highest speed?

Aluminum

What is known as a welding done with a shielded or unshielded carbon or metal electrode

Arc welding

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

an incorrectly set cooling system pressure control

Weekly Test 1

ユーザ名非公開 · 50問 · 13日前

Weekly Test 1