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8th 6 Months > Tpc 341 > Flashcards

Tpc 341 Flashcards

1
Q

You can control chain tension in a chain drive by changing shaft centers or using a(n)?

A

Idler sprocket

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2
Q

A roller chain should be allowed to sag how much?

A

2% of the sprocket center distance

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3
Q

In chain operations the areas of greatest load are?

A

Chain joints

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4
Q

You should make your first full scale inspection of a new chain drive after how long?

A

After 24hrs of operation

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5
Q

Chain side plates that show uneven wear usually indicates that the…

A

Drive is misaligned

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6
Q

In vertical drives without idlers the shafts should be installed at an angle of no more than…

A

60 degrees

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7
Q

The most common cause of drive chain failure is…

A

Improper lubrication

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8
Q

What is type III lubrication?

A

Splash lubrication

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9
Q

A striking or slapping noise during a test run of chain drive may indicate?

A

The chain is striking something

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10
Q

Before using chain that has been stored on open reels you should?

A

Dip it in solvent

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11
Q

After mounting the driving and driven sheaves or pulleys, check their alignment with a?

A

Straightedge

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12
Q

What is the best way to tighten a V-belt and take up the stretch due to normal wear?

A

Make the distance between the shaft centers adjustable

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13
Q

What splice is the stiffest and used mostly on low speed belts?

A

Stepped splice

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14
Q

When test running a belt how long should you run it for?

A

Operate the drive under normal load for 48hrs

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15
Q

What does a burned spot indicate?

A

It indicates the belt has been overloaded

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16
Q

On v-belt drives the components that contact the belt are called?

A

Sheaves

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17
Q

Should you replace all belts on a multi belt drive system at the same time?

A

Yes

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18
Q

How can you check a belts tension?

A

By applying a specific amount of force on the top side of the belt and measuring the deflection

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19
Q

What is the best way to take up slack in flat belts?

A

To adjust the center distance

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20
Q

How do positive drive belt pulleys keep the belt centered?

A

The pulleys have a flange on each side

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21
Q

Do gears permit any misalignment?

A

Gears practically permit no misalignment at all

22
Q

What is the critical dimension for a worm gears?

A

Center distance between the worm and gear

23
Q

If you are going to mount spur or helical gears that have only one hub where should you position the hub?

A

Away from the bearing

24
Q

Check the teeth for cracked or broken areas, when these appear on gears that are almost new the cause is probably?

A

A foreign object that was dragged through the meshing point

25
Q

What is an indication of the gears being too tight?

A

The tips of the gear teeth and roots being gouged or worn

26
Q

During the run in period a set of gears will?

A

Polish up as their minor defects smooth out

27
Q

What is diametral pitch?

A

The ratio of the number of teeth to the number of inches of pitch diameter

28
Q

How can you check gear alignment?

A

Set a steel square on the shaft and hold it against the side of the gear

29
Q

What is the solution to spalling

A

Either reduce the load or to increase the surface strength of the teeth by heat treating them

30
Q

Best solution for gearing with cracked rim?

A

Order or make a replacement gear

31
Q

When floor mounting what must be used to contact the machined surfaces of the housing feet?

A

Steel base pads

32
Q

In housings what prevents the buildup of pressure or the formation of a vacuum inside the housing and assists the flow of lubricants?

A

A breather

33
Q

When storing a housing for a long period of time what should you do?

A

Keep the drive completely filled with a suitable oil

34
Q

Where do most noises originate from after a drive runs for awhile?

A

They originate from the shaft bearings

35
Q

In worn gear drives discoloration of the gear teeth indicates burning, this is caused by?

A

Overloading the teeth

36
Q

How should you check the levelness of the drive of enclosed gears on the foundation?

A

By using a spirit level

37
Q

The most common method to lubricate the bearings of an enclosed gear drive is by?

A

Splashing

38
Q

When test running the drive how long should you let it run for?

A

Let it run at a half load for 8-10 hours

39
Q

After a gear drives first week of operation under full load stop the drive and check what?

A

The oil level

40
Q

Which of the following is on the nameplate of enclosed gear drives?

A

Load capacity

41
Q

Which elements of drive packages should you move to set coupling gap?

A

The motor

42
Q

What instrument is used when precise coupling alignments must be made?

A

The dial indicator

43
Q

The only kind of couplings that require lubrication are?

A

Metal to metal contact couplings

44
Q

Floating shaft couplings should be used when drives exert what kind of force?

A

Axial thrust loads

45
Q

If change has been made in the driven machines power requirements what might you need to do if overloading occurs?

A

Solve the problem by installing the next larger coupling

46
Q

A coupling can serve all purposes except to?

A

Insulate against high temps

47
Q

The gap between a spacer coupling and hubs should be?

A

0 inches

48
Q

The cause for whipping of the floating shaft is usually?

A

Excessive misalignment

49
Q

If a wear patten is uneven on a gear type coupling it’s usually a sign of?

A

Misalignment

50
Q

The slack in the fit between coupling components is called?

A

Backlash

8th 6 Months (11 decks)

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