A new cutting disc is taken from the stores. When subjected to a ring test it fails. What is the most likely reason for this?
It is reinforced.
It was not stored flat.
It is still dirty.
The wrong type of hammer was used.
Next question
A new grinding wheel is taken from the stores. It has a red line across the middle. What does it mean?
Someone has scrapped it.
It has a maximum operating speed of 80 m/s.
It is part of the maker’s logo.
It is a cutting wheel.
Next question
A new grinding wheel is taken from the stores. When subjected to a ring test it fails. Which of these is the most likely reason for this?
It is too small.
It has a red stripe.
It’s edge is uneven.
It was held using wire.
Next question
A new wheel machines are often used for grinding operations. Which of these may cause excessive heat to be created when grinding?
Strong sunlight.
Pushing whell and work together too hard.
Twisting the wheel.
Too small a wheel.
Next question
Abrasive wheel machines found onboard ship are sometimes fitted with a wire brush wheel. What is the problem with bristles coming off a brush wheel?
The bristles are sharp and can puncture skin.
The bristles are hot and can burn through boilersuits.
The job will take longer.
They make a lot of noise.
Next question
Can you see anything wrong with the abrasive wheel machine shown in the picture?
The dressing tool is missing.
The guard is not original type.
The wheel is too small.
No, there is nothing wrong.
Next question
Complete the following statement with the option that best describes the action to be taken when you are finished using a pedestal grinder. When you have finished using a pedestal grinding machine you should:
Keep other people away until it has stopped.
Stop the wheel with your bare hands.
Just walk away.
Stop the wheel with your gloved hands.
Next question
Complete the following statement with the option that best describes the likely result of banging a grinding wheel with the work piece. Banging the work piece against a grinding wheel may:
Cause the wheel to break.
Clear clogging in the wheel.
Make the job go faster.
Make the finish better.
Next question
Complete the following statement with the option that best describes the reason for jamming of an abrasive wheel machine. On a fixed abrasive wheel machine jamming may occur because:
The gap between rest and wheel is too big.
The machine’s fixing bolts are loose.
The work piece is too big.
The work is pressed too hard against the wheel.
Next question
Complete the following statement with the option that best describes the reason why vibration on abrasive wheel equipment is considered to be dangerous. Excessive vibration on abrasive wheel equipment is considered to be very dangerous because:
It makes it a bit more noisy.
It makes your arms ache after a while.
It can lead to wheel breakage.
The bearings will have to be changed sometime.
Next question
Complete the following statement with the option that best describes the reason why you should not press too hard when using a brush wheel on an abrasive wheel machine. When using a brush wheel on an abrasive wheel machine you should not press to hard because:
You may hurt your back.
You will get a rough finish.
You may melt the steel.
You will wear the brush out quickly.
Next question
Complete the following statement with the option that best describes the reason why you should not press too hard with the work piece against a grinding wheel. When using a grinding wheel on a bench machine you should not press too hard because:
You may hurt your back.
The extra heat may cause the wheel to break.
You are not paid enough to rush things.
You may get sore hands.
Next question
During a pre-start check of a bench grinding machine you notice that the on/off switch is cracked and loose. Do you …:
Fix it with some electricians tape.
Go and get some rubber gloves.
Isolate the machine and post a “Do not use” notice.
Make a note to tell the engineers.
Next question
Fine dust made while using abrasive wheels is a problem because …:
It is not a problem as it does not hit you.
It is very messy.
It is really hot.
It can harm your health.
Next question
Grinding wheels are sometimes classified by the bonding method used in the manufacture of the wheels. Which class of grinding wheel is most easy to break?
Resinoid (B).
Rubber (R).
Vitrified (V).
Shellac (E).
Next question
How can you find out the RPM that a pedestal grinding machine is intended to run at?
Check the nameplate on the grinding machine.
Check your ISM manual.
Check any motor nameplate – RPMs are all the same.
Check what RPM is written on the spare wheel in the store.
Next question
How could the noise from grinding possibly lead to a crewmember being injured?
By drowning out a warning shout.
By causing the ship to vibrate until it cracks.
By causing vibration in their teeth and head.
By driving them crazy.
Next question
How many wheels do we normally have on a bench grinder?
1.
2.
3.
4.
Next question
On a bench mounted abrasive wheel machine what should the maximum gap be between wheel and rest before it is adjusted?
5 mm.
1 mm.
10 mm.
3 mm.
Next question
On a grinding wheel label, which of the given options is the code letter for a wheel made mainly of Aluminium Oxide?
O.
C.
Z.
A.
Next question
On a grinding wheel what does “MOS” stand for?
Multi Operation Science.
Maximum Operating Size.
More Operations Style.
Maximum Operating Speed.
Next question
Select the option that correctly completes the following statement. A grinding wheel is said to be “true” when:
It sounds good during a ring test.
It is not cracked.
The label on the side is present.
It is perfectly round and the rest gap is constant.
Next question
Select the option which best defines the term “abrasion” when used in the context of abrasive wheels:
Using coolant.
To be able to stick.
Scoring or wearing away by friction.
To be rough.
Next question
The Porosity or Structure of a grinding wheel is a measure of what?
The size of the grains.
The amount of space between the grains.
The shape of the wheel.
The hardness of the wheel.
Next question
The gap between the grinding wheel and the rest on a bench machine is 4 mm but cannot be made smaller as the rest has no more adjustment. What should you do?
Change the wheel.
Make the rest bracket slot longer.
Bend the rest bracket in a bit.
Carry on working and tell the engineers later.
Next question
The visor on a bench mounted grinding machine is cracked. Which of the actions given in the options is the correct one in such a situation?
Put tape over the crack to seal it.
Use the visor but keep the crack from blocking your view of the contact area.
Use the visor and wear safety glasses “just in case”.
Secure it out of the way and wear goggles instead.
Next question
When changing a brush wheel on a bench grinding machine to a grinding wheel you notice that the securing flanges are smaller than those on the grinding wheel at the other end and only cover 1/4 of the diameter of the grinding wheel. What should you do?
Make the securing nut extra tight so the wheel does not slip.
Ignore the difference.
Mention it to your boss at dinner.
Stop until you find larger flanges.
Next question
When using abrasive wheel equipment which of these can be caused by water?
Loss of all the heat.
Lack of control of the work piece.
A rough cut.
A rough finish.
Next question
When using abrasive wheels what is it that gets hot?
The wheel and the work piece.
Only the wheel.
Only the work piece.
Only the electric motor.
Next question
Which of the following options gives the right wheel bond and grain for grinding a mild steel pipe?
Organic bond + fine grain.
Inorganic bond + fine grain.
Inorganic bond + medium grain.
Organic bond + medium grain.
Next question
Which of the following options gives the right wheel bond and grain for removing burrs after flame cutting mild steel?
Organic bond + coarse grain.
Organic bond + medium grain.
Inorganic bond + fine grain.
Inorganic bond + medium grain.
Next question
Which of the following options gives the right wheel bond and grain for sharpening a knife?
Organic bond + medium grain.
Organic bond + fine grain.
Inorganic bond + coarse grain.
Inorganic bond + fine grain.
Next question
Which of the following options gives the right wheel bond and grain for sharpening drill bits?
Inorganic bond + fine grain.
Organic bond + medium grain.
Organic bond + fine grain.
Inorganic bond + coarse grain.
Next question
Which of the following options gives the right wheel hardness and porosity for grinding a mild steel pipe?
A medium hardness wheel with medium porosity.
A medium hardness wheel with open porosity.
A soft wheel with closed porosity.
A hard wheel with closed porosity.
Next question
Which of the following options gives the right wheel hardness and porosity for removing burrs after flame cutting mild steel?
Organic bond + medium grain.
Organic bond + coarse grain.
Inorganic bond + fine grain.
Inorganic bond + medium grain.
Next question
Which of the following options gives the right wheel hardness and porosity for sharpening a knife?
Inorganic bond + fine grain.
Inorganic bond + coarse grain.
Organic bond + fine grain.
Organic bond + medium grain.
Next question
Which of the following options gives the right wheel hardness and porosity for sharpening drill bits?
Inorganic bond + coarse grain.
Inorganic bond + fine grain.
Organic bond + fine grain.
Organic bond + medium grain.
Next question
Which of the following options gives the right wheel hardness and porosity for grinding a mild steel pipe?
A medium hardness wheel with open porosity.
A medium hardness wheel with medium porosity.
A soft wheel with closed porosity.
A hard wheel with closed porosity.
Next question
Which of the following options gives the right wheel hardness and porosity for removing burrs after flame cutting mild steel?
A medium hardness wheel with open porosity.
A medium hardness wheel with medium porosity.
A soft wheel with closed porosity.
A hard wheel with closed porosity.
Next question
Which of the following options gives the right wheel hardness and porosity for sharpening drill bits?
A medium hardness wheel with closed porosity.
A soft wheel with closed porosity.
A soft wheel with open porosity.
A hard wheel with medium porosity.
Next question
Which of the given options is the main reason to “dress” a grinding wheel?
To make the wheel look better.
To remove clogged abrasive from the wheel.
To add sharp grains to the wheel.
To allow the side of the wheel to be used.
Next question
Which of the given options is the most appropriate when starting up a pedestal grinding machine?
Press the work against the wheel so it speeds up slowly.
Put your ear near the wheel to listen for noises.
Look at the lights to see if they dim.
Keep everybody clear.
Next question
Which of these is the most brittle (easy to break)?
A brush wheel.
A cutting wheel.
A gear wheel.
A grinding wheel.
Next question
Which one of the given options is the main reason why you should not grind wooden broom handles on grinding wheels?
The wheel will get clogged.
The wood may catch fire.
A broom handle is too long.
The wood will be rough afterwards.
Next question
Which wheel properties are best for sharpening a knife?
A soft wheel with open porosity.
A soft wheel with closed porosity.
A medium wheel with closed porosity.
A hard wheel with medium porosity.
Next question
Why do abrasive cutting wheels normally contain some reinforcement?
Because cutting is harder than just grinding.
Because of the special abrasive they use.
Because they are thin and easily broken.
Because they spin faster.
Next question
Why is grinding wheel breaking up during a grinding operation considered bad?
Grinding wheels are expensive.
The pieces are big and move fast enough to kill.
The damaged edge can lead to jamming.
It will take an hour to fit a new wheel.
Next question
With regard to grinding very small work pieces, which of the given options is the recommended way to hold the work piece?
Held using pliers.
Held without using gloves.
Clamped in locking pliers or a vice.
Glued to a larger piece of scrap.
Next question
You go to use a bench machine and see that the electrical cable insulation has a few cuts in it so that you can see the blue wire. Which of the actions given in the options is the correct one in such a situation?
Wrap the cuts with electricians tape before using it.
Mark it “Do not use” and report it to the electrician.
Use the machine but keep away from the cut cable.
Use the machine and make a note to tell the electrician later.
Next question
You notice that the edge of a grinding wheel on a bench machine is quite rounded on the outer side. Which one of the given options is the best action to take?
Be careful to use only the inner part of the wheel where it is still flat.
Get the wheel dressed.
Ignore it, you are only sharpening 1 scrapper.
Use the side of the wheel.
Next question
You see that the brush wheel on the abrasive wheel machine has a place where the bristles are bent lower than the rest. Which one of the given options is the best action to take?
Change the wheel.
Use the wheel but be extra careful.
Use the wheel, they will straighten out when spinning.
Cut the higher bristles so they are all the same height again.
Next question
Which of the given options is true? Select all three correct options. Using an abrasive wheel can:
Warn people to keep away.
Make other crewmembers deaf.
Drown out warnings.
Make you deaf.
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* In some questions may be more, than one right answer.
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