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POWER ENGINEERING (CHAPTER 4)

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TRANSMISSION OR POWER IN MECHANICAL SYSTEMS

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POWER ENGINEERING (CHAPTER 4)
 

POWER ENGINEERING (CHAPTER 4)Online version

TRANSMISSION OR POWER IN MECHANICAL SYSTEMS

by Grace Balahay
1

In this method, a machine is directly driven from the shaft of an electric motor or an internal combustion engine. There is usually a clutch or a flexible coupling between the power source and the machine.

Written answer

2

example of direct drive method

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3

maybe either flat or V-shaped. It can be connected in an open-belt drive or in a cross-belt drive

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4

belt speeds should not exceeds

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5

the ideal belt speed is

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6

the belt is used around pulleys having two parallel shafts that rotate in the same direction. When the shafts are far apart, the lower side of the belt becomes the tight side and the upper side becomes the slack side. This is because the upper side will sag due to its own and thus increase the arc of contact.

Written answer

7

the belt is used around pulleys having two parallel shafts which rotate in the opposite direction. At the junction where the belt crosses, it rubs against itself and wears off. To avoid excessive wear, the shafts must be placed at a maximum distance from each other and operated at very low speeds.

Written answer

8

V-belts are employed extensively in agricultural machinery applications wherein it is not necessary to maintain exact speed ratios. They tend to cushion shock loads, do not require lubrication and less critical to misalignment than are other types of drives. However, V-belts are not suitable for heavy loads at low speeds.

Written answer

9

v-belts can transmit a given amount of power with less overall shaft pull than a flat-belt drive because a v-belt wedges into the ______grooves.

Written answer

10

used where the power requirement is low and the speed is relatively slow

Written answer

11

more efficient than a hook-link chain since the rollers reduce friction against the sprocket teeth.

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12

are employed to transmit power if the machine is rather compact and the shafts are close together.

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13

with parallel shafts. The teeth are also parallel to the shaft

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14

teeth are located inside of the rim

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15

teeth are located outside of the rim

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16

with shafts at right angles or nearly so. This gear is used when power has turn a corner. The teeth are inclined which varies according to the difference in the diameter of the gears meshing together.

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17

consists of a shaft called worm with screw-like threads which run spirally around it.

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18

this meshes with helical spur gear called ___. As the worm turns, the teeth of the sector which fit in the grooves, are turned slowly.

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19

may either be a spur gear or a beveled gear, but it does not have straight teeth. The teeth are more less curved so that they will remain in mesh or in contact longer than straight teeth.

Written answer

20

smaller of any two gears meshing together. It may be a spur, bevel or an helical gear

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21

Power is transmitted from a tractor to an implement by mean of a shaft called.

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22

a complete shaft including a universal joint is called

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23

are frequently employed also to transmit power at various angles on a particular implement.

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24

are used to transmit power from an input source to an output in situations where many obstacles are present.

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25

are used for raising, lowering and controlling almost all types of field equipment.

Written answer

26

the effective length of one chain link

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