POWER ENGINEERING (CHAPTER 4)

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TRANSMISSION OR POWER IN MECHANICAL SYSTEMS

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Grace Balahay

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POWER ENGINEERING (CHAPTER 4)


POWER ENGINEERING (CHAPTER 4)Version en ligne TRANSMISSION OR POWER IN MECHANICAL SYSTEMS par 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 Written answer 3 maybe either flat or V-shaped. It can be connected in an open-belt drive or in a cross-belt drive Written answer 4 belt speeds should not exceeds Written answer 5 the ideal belt speed is Written answer 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. Written answer 12 are employed to transmit power if the machine is rather compact and the shafts are close together. Written answer 13 with parallel shafts. The teeth are also parallel to the shaft Written answer 14 teeth are located inside of the rim Written answer 15 teeth are located outside of the rim Written answer 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. Written answer 17 consists of a shaft called worm with screw-like threads which run spirally around it. Written answer 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. Written answer 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 Written answer 21 Power is transmitted from a tractor to an implement by mean of a shaft called. Written answer 22 a complete shaft including a universal joint is called Written answer 23 are frequently employed also to transmit power at various angles on a particular implement. Written answer 24 are used to transmit power from an input source to an output in situations where many obstacles are present. Written answer 25 are used for raising, lowering and controlling almost all types of field equipment. Written answer 26 the effective length of one chain link Written answer

POWER ENGINEERING (CHAPTER 4)

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POWER ENGINEERING (CHAPTER 4)Version en ligne

par Grace Balahay

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.

example of direct drive method

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

belt speeds should not exceeds

the ideal belt speed is

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.

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.

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

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

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

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

teeth are located inside of the rim

teeth are located outside of the rim

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.

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

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

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.

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

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

a complete shaft including a universal joint is called

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

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

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

the effective length of one chain link