competence 8

100問 • 12ヶ月前

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When drilling blind holes with standard drill press, the proper method of stopping the progress of the drill boring through the work is by

using a depth stop

What is the end of shaft condition before the maintenance repair is carried out?

chamfered

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

misalignment of the joints will results to excessive strain

What precaution should be followed when using a chisel having a mushroom head?

Removed the ragged edges by grinding

The blade for a proper hacksaw should be installed with the teeth

pointing toward the motor end of the machine

Which of the followi9ng types of files would produce a fine finish when draw filing?

Mill cut

Which of the following hand taps are recommended in cutting internal threads on a blind hole?

Pilot and intermediate

Which of the following indicator is used to determine the hardness of a grease?

Penetration number

Knowing the construction and the operating action of the milling machine will lessen the chance to the machine from being

damage serously

Disekl engine piston ring ends can be machine in different shapes. The step-cut ring end offers the advantage of

a decreased possibility of ring seizure

Hacksaw cutting is more effective when pressure applied on the

foreward stroke

A follower rest should make use a lathe to machine

threads on longer slender shafts

Which of the files listed is commonly referred to as a "rat-tail" file

Small round

When drilling hole in a piece of work chuked in a lathe you should mount the drill chunk in the

tailstock

What should you do when using a chisel with a mushroom head?

Removed the ragged edges by grinding

What is the theoretical lift of a pump handling fresh water at atmospheric pressure?

10.35 m

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 is the complete process when copper plates are used for making gaskets that is usually annealed by heating red cherry color?

Cooling slowly in air

What is this kind of metal which is light, strong and corrosion-resistant used as the plate material in playte-type heat exchanger?

titanium

Which of the files listed will have coarsely spaced teeth?

Bastard cut

How do you call a welding process with the work in the positive pole and the electrodes in the negative pole ?

Straight polarity welding circuit

When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by

renewing both driving and driven gears as a set

Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?

Replaceable impeller and casing wearing rings

What hand tool is commonly used in drilling, reaming, hand tapping , and die threading process

Vise grip

What type of tooth set on a hacksaw blade where every third tooth remains striaght, while the other two are alternately set?

Rake

What operation is used in smoothing and squaring the surface of a round hole ?

counterboring operation

How do you make it easier for a hand hacksaw to cut a work piece?

it will dig into the work piece and tend to whirl around

What is the primary used of a soft faced hammer or mallet?

For striking a surface without causing damage

When repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed?

Replace all the packing rings

A micrometer screw has a pitch of ?

50 thread per inch

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

to prevent sleeves being caught up on work piece or chuck

Before using an all-purpose electric measuring instrument (multimeter) utilizing internal batteries to supply power for resistance measuremetns, you should first

select the proper reistance range

A centrifugal pump vibrates excessively during operation, upon dissasembling the pump it is found that the impeller is out of balance. Without an available spare, you should

remove metal from the heavy side by machining in a lathe

What metal is used as an alloying material in the manufacture of varius special steels?

vanadium

The term refering to the number of teeth per inch on a hacksaw blade is known as the ?

pitch

After removing an old set of rings, which of the following conditions is indicated if a bright spot is found on each end of a broken piston ring?

Insufficient gap clearance

Stainless steel is an alloy composed mainly of?

chronium and steel

What size circuoar bar is required to maek a hexagonal nut of 16mm sides alont the

16mm

What is the ultimate stress of mild steel used in boiler plates?

30 tons/sq.m

What is the purpose of annealing the steel?

to make it softer

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

Resistance welding

Monel metal is an alloy composed mainly of ?

Nickel and copper

When erplacing packing rings in the stuffing boxes of reciprocating pump piston rods, the end of the rings should be cut?

square

Which of the listed numeric values represents the smallest size drill

#80

Temporary repairs to an open DC propulsion armature coilcan be made by

disconnecting coil ends, insulating each, and short circuiting the two commutator bars

Which of the following spanners is preferable to use?

Ring

Babbit metal is used to make

bearing surfaces

Accidental ground in a shipboard electrical system must be repaired as soon as possible as the will

damage insulation and may cause severe outages

In measuring the clearances between the main engine bearings and the crankshaft, which of these material is commonly applied ?

Plasti-gauge

What is the workpiece motion and tool motion respectively in a horizontal boring machine?

Stationary and rotaional with translation

For greater accuracy, some micrometers have a vernier scale making it possible to read in increments of?

ten thousands of an inch

The dead center of a lathe can be used only after the end of the work piece. How does the lathe hold the workpiece?

center drill

For safety of the piping systems, what characteristics of gasket is most advisable to use?

Can withstand fluid temperature and chemically stable with the fluid used

Which on of the following files type are always Mill files?

single cut

To prevent vibration damage to the fuel supply line of a diesel engine, you may use

a length of approved flexible nonmetallic hose

When steel, cast iron, or other metals with surface scale are being turned, what roughing cut should be taken first?

Get under the scale deep enough

As per regulations permit to repairs the boiler safety valves while installed on a main propulsion boiler and may be made by

The chief engineer in an emergency

Pipe threads are made of what tools are you use?

file a nick where the cut is to be sterted

Which of the following metal material has the lowest cutting speed for an effective rough cutting operation if a high-speed cutter is to be used in the modern milling machine onboard?

carbon steel

Copper gaskets are usually annealed by heating to red hot cherry and should be?

cooled slowly in air

If a centrifugal pumps delivers insufficient dishcarge pressure due to worn wear rings, what corrective action is called for?

Repalce the rings

Tapping threads into a blind hole should be finished by using a

bottoming tap

Which of the following process of annealing copper plates that are used for gaskets?

By heating cherry red hot and cooling slowly in air

A side from welding, the best material to use in bonding pipes carrying low temperature liquids or fluids is

epoxy resin

Which compound gauge measure pressure indicated on both high and low on outside pressure?

Atmospheric pressure

What is the cause of a bluish smoke observed in the exhaust of an operating diesel engine?

A scored cylinder liner

What is the primary use of a soft-faced hammer or mallet?

For striking a surface without causing damage

How would you checked the alignment of coupling faces?

inserting a feeler gage to different position points of the coupling

Which drill size would you use to machine and tap a 3/4 -10 National Coarse internal thread?

21/32 inches

Which of the following characteristics is true relative to meshing with corrosion protection oils, as the resultant mixture ?

the gear of largeer diameter will rotate at a slower RPM

Which of the following metal material has the lowest cutting spped for an effective rough cutting operation if a high speed cutter is to be used in the modern milling machine onboard?

carbon steel

When it necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be

pluged

What safety precautions should be done changing the spindle speeds on a lathe machine?

Stop the lathe operation

if a drill press is used to completely bore through a metal plate, feed pressure on the drill bit should be eased as the bit braks through the bottom of the hole to prevent

the drill bit from jamming and spinning the workpiece

Small leaks in gaskets should be stopped immediately after installation because

the leak will probably worsen in time

Which one of the following chisels should be used cutting oil grooves?

Round nose

Packing rings installed on auxiliary turbines are lubricated by

moisture in the turbine steam

The number of screw threads per inch for a Standard National Coarse 1/2 inch bolt is:

Which of the following kind of metal is ductile and maleable can be corroded by air or water?

aluminum

Used to reduce cargo pump leakage to the pump room bilge of a tanker ship is the

Mechanical seals

Sealing lines provides sealing liquid flow to the stuffing box of a centrifugal pump

to cool the shaft

The loop seal connected to the main condenser returns the draim from the

intercondenser

A diesel engine fails to start due to excessive water in the fuel. Which item on the list where the water should removed before the engine can be started?

fuel lines

To repair or replace defective diesel engine high pressure fuel pipe it must be of the same length and diameter as the original piping.

maintain specified injection characteristics

Which of the files listed can be used for sharpening a tool?

A single cut file

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

Union

The best mehtod of fixing a winch motor bearing of the sealed type that is running hot is to

replace the bearing with a new one

The gasket and the broken studs have been replaced on a tank manhole cover. Which of the following methods is satisfactory for testing the rapair?

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

Gland sealing steam is used during steam turbine operation to prevent the loss of

vacuum

If the capacity of a centrifugal pump decrease gradually over a long period of time, you should replace the

wearing rings

What is the end of shaft condition before the maintenance repair is carried out?

Chamfered

What machine which can flatter surface on horizontal, vertical or angular plane?

Shaper machine

To prevent overheating and scoring of the shaft after repacking the stuffing box, which of the following procedures should be carried out?

Tighten the packing in small increments while the pump is operating

When renewing section of pipe in a hydraulic system, it should always indicate the nominal pipe size of the piping?

size for threaded connections

To repair a small electrical motor that has been submerged in salt water, you should,

wash it fresh water and apply an external source of heat

What saw is more suitable for cutting metal in tight quarters?

Stab saw

Which of the listed tools should be used to remove a tapered roller bearing from a shaft?

An arbor press

What kind of non-metallic mineral material which can withstand very high temperature and unaffected by steam petrol, paraffin, fuel, oil and lubricants?

Asbestos

Which of the following sensing device in a pressure gauge using Bourdon principle?

Metal tube

100

After using a pipe cutter to cut a piece of pipe, the inside edge of the pipe should be

deburred with a pipe reamer

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