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Home Online tests CBT Test for seamans about Operation and Maintenance with Grinding Wheels (CBT)
Online testing: Test for seamans about Operation and Maintenance with Grinding Wheels (CBT)
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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.
A new grinding wheel is taken from the stores. It has a red line across the middle. What does it mean?
It has a maximum operating speed of 80 m/s.
Someone has scrapped it.
It is part of the maker’s logo.
It is a cutting wheel.
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.
A new wheel machines are often used for grinding operations. Which of these may cause excessive heat to be created when grinding?
Pushing whell and work together too hard.
Strong sunlight.
Twisting the wheel.
Too small a wheel.
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.
Can you see anything wrong with the abrasive wheel machine shown in the picture?
The guard is not original type.
The dressing tool is missing.
The wheel is too small.
No, there is nothing wrong.
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.
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.
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.
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 can lead to wheel breakage.
It makes it a bit more noisy.
It makes your arms ache after a while.
The bearings will have to be changed sometime.
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 will wear the brush out quickly.
You may hurt your back.
You will get a rough finish.
You may melt the steel.
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:
The extra heat may cause the wheel to break.
You may hurt your back.
You are not paid enough to rush things.
You may get sore hands.
During a pre-start check of a bench grinding machine you notice that the on/off switch is cracked and loose. Do you …:
Isolate the machine and post a “Do not use” notice.
Fix it with some electricians tape.
Go and get some rubber gloves.
Make a note to tell the engineers.
Fine dust made while using abrasive wheels is a problem because …:
It can harm your health.
It is not a problem as it does not hit you.
It is very messy.
It is really hot.
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?
Vitrified (V).
Resinoid (B).
Rubber (R).
Shellac (E).
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.
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.
How many wheels do we normally have on a bench grinder?
2.
1.
3.
4.
On a bench mounted abrasive wheel machine what should the maximum gap be between wheel and rest before it is adjusted?
3 mm.
5 mm.
1 mm.
10 mm.
On a grinding wheel label, which of the given options is the code letter for a wheel made mainly of Aluminium Oxide?
A.
O.
C.
Z.
On a grinding wheel what does “MOS” stand for?
Maximum Operating Speed.
Multi Operation Science.
Maximum Operating Size.
More Operations Style.
Select the option that correctly completes the following statement. A grinding wheel is said to be “true” when:
It is perfectly round and the rest gap is constant.
It sounds good during a ring test.
It is not cracked.
The label on the side is present.
Select the option which best defines the term “abrasion” when used in the context of abrasive wheels:
Scoring or wearing away by friction.
Using coolant.
To be able to stick.
To be rough.
The Porosity or Structure of a grinding wheel is a measure of what?
The amount of space between the grains.
The size of the grains.
The shape of the wheel.
The hardness of the wheel.
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.
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?
Secure it out of the way and wear goggles instead.
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”.
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?
Stop until you find larger flanges.
Make the securing nut extra tight so the wheel does not slip.
Ignore the difference.
Mention it to your boss at dinner.
When using abrasive wheel equipment which of these can be caused by water?
Lack of control of the work piece.
Loss of all the heat.
A rough cut.
A rough finish.
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.
Which of the following options gives the right wheel bond and grain for grinding a mild steel pipe?
Organic bond + medium grain.
Organic bond + fine grain.
Inorganic bond + fine grain.
Inorganic bond + medium grain.
Which of the following options gives the right wheel bond and grain for removing burrs after flame cutting mild steel?
Organic bond + medium grain.
Organic bond + coarse grain.
Inorganic bond + fine grain.
Inorganic bond + medium grain.
Which of the following options gives the right wheel bond and grain for sharpening a knife?
Inorganic bond + fine grain.
Organic bond + medium grain.
Organic bond + fine grain.
Inorganic bond + coarse grain.
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.
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.
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.
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.
Which of the following options gives the right wheel hardness and porosity for sharpening drill bits?
Inorganic bond + fine grain.
Inorganic bond + coarse grain.
Organic bond + fine grain.
Organic bond + medium grain.
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.
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 medium porosity.
A medium hardness wheel with open porosity.
A soft wheel with closed porosity.
A hard wheel with closed porosity.
Which of the following options gives the right wheel hardness and porosity for sharpening drill bits?
A soft wheel with closed porosity.
A medium hardness wheel with closed porosity.
A soft wheel with open porosity.
A hard wheel with medium porosity.
Which of the given options is the main reason to “dress” a grinding wheel?
To remove clogged abrasive from the wheel.
To make the wheel look better.
To add sharp grains to the wheel.
To allow the side of the wheel to be used.
Which of the given options is the most appropriate when starting up a pedestal grinding machine?
Keep everybody clear.
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.
Which of these is the most brittle (easy to break)?
A grinding wheel.
A brush wheel.
A cutting wheel.
A gear wheel.
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.
Which wheel properties are best for sharpening a knife?
A soft wheel with closed porosity.
A soft wheel with open porosity.
A medium wheel with closed porosity.
A hard wheel with medium porosity.
Why do abrasive cutting wheels normally contain some reinforcement?
Because they are thin and easily broken.
Because cutting is harder than just grinding.
Because of the special abrasive they use.
Because they spin faster.
Why is grinding wheel breaking up during a grinding operation considered bad?
The pieces are big and move fast enough to kill.
Grinding wheels are expensive.
The damaged edge can lead to jamming.
It will take an hour to fit a new wheel.
With regard to grinding very small work pieces, which of the given options is the recommended way to hold the work piece?
Clamped in locking pliers or a vice.
Held using pliers.
Held without using gloves.
Glued to a larger piece of scrap.
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?
Mark it “Do not use” and report it to the electrician.
Wrap the cuts with electricians tape before using it.
Use the machine but keep away from the cut cable.
Use the machine and make a note to tell the electrician later.
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?
Get the wheel dressed.
Be careful to use only the inner part of the wheel where it is still flat.
Ignore it, you are only sharpening 1 scrapper.
Use the side of the wheel.
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.
Which of the given options is true? Select all three correct options. Using an abrasive wheel can:
Answer
Тест оценивает знания по безопасной эксплуатации и обслуживанию шлифовальных кругов, что важно для предотвращения травм.
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