Module - Gearing Fundamentals Flashcards Preview

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Flashcards in Module - Gearing Fundamentals Deck (32):
1

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

a) True

b) False

TRUE

2

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

a) True

b) False

TRUE

3

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

a) True

b) False

TRUE

4

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

a) True

b) False

TRUE

5

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

a) True

b) False

TRUE

6

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

a) True

b) False

 

Q image thumb

FALSE

7

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

a) True

b) False

FALSE

8

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

a) True

b) False

FALSE

9

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

a) True

b) False

TRUE

10

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

a) True

b) False

TRUE

11

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

a) True

b) False

FALSE

12

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

a) True

b) False

FALSE

13

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

FALSE

14

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

FALSE

15

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

FALSE

16

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

a) True

b) False

FALSE

17

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

a) True

b) False

TRUE

18

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

a) True

b) False

TRUE

19

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

a) True

b) False

FALSE

20

Herringbone gears are light duty drivers.

a) True

b) False

FALSE

21

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

a) True

b) False

FALSE

22

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

b) False

TRUE

23

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

a) True

b) False

TRUE

24

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

a) True

b) False

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