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8th Sixth > 341 > Flashcards

341 Flashcards

1
Q

You can control chain tension in a chain drive by changing shaft centers or using an ____ sprocket

A

Idler

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2
Q

A roller chain should be allowed to sag ____ percent of the distance between sprocket centers

A

About 2

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3
Q

In chain operations the area of greatest load are the

A

Chain joints

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4
Q

You should make your first full scale inspection of a new drive chain after ____ hours of operation

A

24

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5
Q

Chain side plates that show signs of uneven wear usually indicate that the

A

Drive is misaligned

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6
Q

In a vertical chain drive without and idler 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 chain drive failure is

A

Improper lubrication

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8
Q

Which of the following describes the Type III lubrication method?

A

Splash

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9
Q

A scrapping or slapping noise during a test run of a chain drive may indicate that

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

Clean it with solvent

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11
Q

After mounting sheaves and pulleys you should check their alignment with a

A

Straightedge

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12
Q

The best way to tighten a v belt that has stretched is to

A

Adjust the distance between sheaves

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13
Q

A splice commonly used on low speed flat belts is the ____ splice

A

Stepped

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14
Q

If a new flat bell is running well how long should you test run it under normal load.

A

48 hours

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15
Q

A burned spot on a belt probably indicates that

A

The belt is overloaded

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16
Q

What type of belt is installed on sheaves rather than on pulleys

A

V belt

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17
Q

If a v belt in a multi belt drive shows wear you should

A

Replace the full set of belts

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18
Q

Which of the following is the correct way to check a V belts tension

A

Apply a specific amount of force to the top side of the belt

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19
Q

Which of the following is the best way to take up slack in a flat belt

A

Adjust the center distance

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20
Q

The pulleys for a positive drive belt have an

A

Flange in each side

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21
Q

Which of the following drives permits practically no misalignment of the shaft

A

Gear

22
Q

The critical dimension that ensures accurate meshing of a work and work gear is its

A

Distance between the centers

23
Q

When mounting spur of helical gears that have only one hub you should position the hub

A

Away form the bearing

24
Q

When cracked or broken areas appear on great teeth that are almost new the cause is probably

A

Foreign object

25
Q

It the metal at the tips and roots of gear teeth has been gouged or worn, the cause is probably

A

To tight of a fit between gears

26
Q

Which of the following happens to the open gearing during the run in period

A

Gears become pitted

27
Q

The DP of a gear is the ratio of the number of teeth to the ___ in inches

A

Pitch diameter

28
Q

Which of the following is used to check gear alignment after installation

A

Steel square

29
Q

What should you do if spalling occurs in a open gear drive

A

Heat treat the teeth

30
Q

Which of the following is the best solution for hearing with cracked rims

A

Replace the gear

31
Q

When installing an enclosed gear drive on the floor you should mount the feet on the

A

Steel based pads

32
Q

What component of an enclosed gear drive prevents the buildup of pressure or the formation of a vacuum inside the drive housing?

A

Breather

33
Q

If an enclosed gear drive is to be stored in the plant for a long time, you should

A

Fill the drive completely with oil

34
Q

Most unusual noises that develop after an enclosed gear drive has run a while onginate in the

A

Shaft bearings

35
Q

What does discoloration of worm gear teeth indicate?

A

Burning caused by overloading

36
Q

Which tool is used to check the levelness of an enclosed gear drive on its foundation?

A

Spirit level

37
Q

Which is the most common method of lubrication for bearings on enclosed gear drives?

A

Splash

38
Q

During the run in period, you should run the drive system at half load for ____ hr

A

8 to 10

39
Q

After a gear drive’s first week of operation under full load, you should

A

Check the oil level

40
Q

Which of the following is found on the nameplate of an enclosed gear drive?

A

Load capacity

41
Q

Which element of a drive package should you move to set the coupling gap?

A

Motor

42
Q

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

A

Dial indicator

43
Q

The onty kind of couplings that require lubrication are those that have

A

Metal to metal contact

44
Q

A floating shaft coupling should be used when the

A

Drives exert axial thrust

45
Q

if the power requirements of a driven machine have been changed so that overloading occurs, you can solve the problem by installing (the) (a)

A

Next large coupling

46
Q

A coupling can serve all of the following purposes except

A

Insulate against high temperature

47
Q

The gap between a spacer coupling and the hubs should be ___ in

A

0

48
Q

What is the usual cause of whipping on a floating shaft?

A

Excessive misalignment

49
Q

An uneven wear pattern on a gear-type coupling is usually a sign of

A

Misalignment

50
Q

The slack in the fit between coupling components is known as

A

Backlash

8th Sixth (11 decks)

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