Module - Gearing Fundamentals Flashcards

1
Q

Gears are positive power transmission devices that are used where there can be no slippage.

a) True
b) False

A

TRUE

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2
Q

The pinion gear is usually the smallest gear in the set.

a) True
b) False

A

TRUE

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3
Q

Most gears are be made to the standards set by the AGMA.

a) True
b) False

A

TRUE

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4
Q

A drive using helical gears can have the gears set up so they are overhung.

a) True
b) False

A

TRUE

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5
Q

In a compound gear system there can be six gears and four shafts.

a) True
b) False

A

TRUE

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6
Q

The gear set shown in Figure 3 has a left-hand pinion and a right-hand ring gear.

a) True
b) False

A

FALSE

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7
Q

The flank of the gear tooth is located in the addendum.

a) True
b) False

A

FALSE

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8
Q

If the circular pitch is known, it is the best defining description of the gear teeth.

a) True
b) False

A

FALSE

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9
Q

A gear set that has a 20° pressure angle is stronger than a gear set with a 14° pressure angle.

a) True
b) False

A

TRUE

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10
Q

It is best to measure the backlash of a gear set at the pitch circle.

a) True
b) False

A

TRUE

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11
Q

A herringbone gear with a diametral pitch of 20 should have at least 0.005 inch backlash.

a) True
b) False

A

FALSE

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12
Q

A gear with a diametral pitch of 4 has very small teeth.

a) True
b) False

A

FALSE

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13
Q

A gear train has 15 gears meshing together with the input gear rotation in the clockwise direction (CW). The output gear should turn in the counter-clockwise (CCW) direction.

a) True
b) False

A

FALSE

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14
Q

If there are several gear reductions in a gearbox, with ratios of 4:1, 5:1 and 2.5:1, the final reduction of the gearbox will be 45:1.

a) True
b) False

A

FALSE

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15
Q

A gearbox has a 10:1 reduction driven by a 1hp electric motor at 1750 rpm. The output from the gearbox will be 10 hp at a speed of about 175 rpm. a) True

b) False

A

FALSE

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16
Q

Spur gears have high axial thrust and require thrust bearings on each side of the gearbox.

a) True
b) False

17
Q

Helical gears with parallel shafts must use gears of the opposite hand.

a) True
b) False

18
Q

Double helical gears are good for high speeds and heavy loads.

a) True
b) False

19
Q

A spur gear set that intersects at 90° must be of the same hand.

a) True
b) False

20
Q

Herringbone gears are light duty drivers.

a) True
b) False

21
Q

Bevel gears cross over at 90° and can be straight, spiral or Zerol.

a) True
b) False

22
Q

Spiral bevel gears look very similar to hypoid gears. a) True

b) False

23
Q

Hypoid gears have high sliding action and require an EP additive in the oil.

a) True
b) False

24
Q

The heel of a hypoid or spiral bevel gear is near the inner circle.

a) True
b) False

25
Worm gears have a lot of sliding action. a) True b) False
TRUE
26
Worm gears are less efficient than most other types of gears. a) True b) False
TRUE
27
A worm gear that has 10 starts will be considered a self-locking gear set. a) True b) False
FALSE
28
A double-throated worm and worm wheel gear set will have maximum gear tooth contact. a) True b) False
TRUE
29
Light-duty open gear drives are often made from synthetic materials like nylon or phenolics. a) True b) False
TRUE
30
A planetary gear system has a sun, stars and ring gear as part of the whole planetary system. a) True b) False
FALSE
31
If the input power is on the sun gear and the carrier is locked to the sun, the output will be a forward reduction. a) True b) False
FALSE
32
A planetary gear system can be considered a single reduction unit. a) True b) False
FALSE