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Mod 6 > 6.9 > Flashcards

6.9 Flashcards

1
Q

What is used to change direction of control runs?

A

Chains

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2
Q

What is meant by pitch in relation to chains?

A

The distant between the centre of chain links

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3
Q

What is a bi-planer block?

A

A mechanical link that turns a chain 90°

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4
Q

Why must a chain wheel have more than 12 teeth?

A

The wear will be too high otherwise

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5
Q

What is the minimum amount of teeth on a gear chain?

A

17

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6
Q

Why are chain retainers used?

A

To prevent the chain jumping from the sprocket

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7
Q

Why are couplings used?

A

To connect two shafts together?

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8
Q

What are the different types of couplings?

A
  • solid coupling
  • safety coupling
  • movable and disconnectable couplings
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9
Q

What are the two types of solid couplings?

A

Disk and sleeve couplings

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10
Q

Where are disk couplings used on voyager?

A

Slat drive shafts

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11
Q

When are movable couplings used?

A

When shafts are not aligned or if position changes during operation

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12
Q

When are extension couplings used?

A

When small longitudinal movement is needed (such heating during operation)

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13
Q

What is a drive gear?

A

A gear that is giving an input/ driving into something

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14
Q

What is a driven gear?

A

When a gear is being driven by something

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15
Q

If a drive gear is turning clockwise, what direction is the driven gear turning?

A

Anti-clockwise

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16
Q

How do you gain mechanical advantage when using gears?

A

By having gears with different amount of teeth

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17
Q

How do you reduce the noise of toothed-wheel gears?

A

Ground tooth flanks and operate in oil

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18
Q

When are external spur gears used?

A

When a change of speed is required and shafts lie parallel to each other

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19
Q

When are internal spur gears used?

A

When a change of speed is required whilst maintains an overall minimum diameter

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20
Q

What is the smallest of the pair of spur gears referred as?

A

The pinion

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21
Q

What is the largest of the pair of spur gears referred as?

A

The spur

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22
Q

What is special about the internal spur gear?

A

Both gears turn the same direction

23
Q

Why do helical gears transmit more power that straight gears?

A

More teeth in mesh for larger contact area

24
Q

Why is a rack and pinion used?

A

When you want to transform rotational motion into linear motion

25
Q

How does a worm gear work?

A

A gear will rotate and turn a spiral shaft to make it spin

26
Q

When are beverages gears used?

A

When transmitting the drive between shafts which have intersecting axes (two shafts at 90°)

27
Q

What angle should the teeth on a herringbone gear not exceed?

A

20°

28
Q

When are herringbone gears used?

A

When transmitting large forces

29
Q

What is meant by gear ratio?

A

The ration of the rotational speeds of multiple gears

30
Q

What happens if the drive gear is bigger than the driven gear?

A

The smaller driven gear will rotate quicker

31
Q

What is the formula for gear ratios?

A

T2/T1

teeth on gear 2/ teeth on gear 1

32
Q

What is meant by backlash?

A

The clearance between gear teeth at the point of mesh

33
Q

Why must you have some backlash in gears?

A

To allow for lubrication and expansion

34
Q

What would happen if the backlash was too high?

A

The gears would start to wear

35
Q

What is meant by meshing?

A

The point at which the teeth are engaged with each other and ready to transmit power

36
Q

If you have a larger mesh angle what does this mean to the gear teeth?

A

They are also larger

37
Q

Why must all the gears in the chain have the same mesh angle?

A

Because they wont function correctly otherwise

38
Q

What is a idler gear?

A

The gear in between the drive and driven gears

39
Q

What is a intermediate gear?

A

It just like an idler gear but it has its own shaft

40
Q

What is a lay-shaft?

A

A term used to describe a shaft that supports an idler or intermediate gear

41
Q

What is a step-up drive?

A

When a gear train has a rotational speed output higher than the input

42
Q

What is a step-down drive?

A

When a gear train has a rotational speed output lower than the input

43
Q

What is a gear train?

A

A series of gears

44
Q

What is a compound gear?

A

A gear that has more than on driving face

45
Q

Where is a planetary reduction gear train mostly used?

A

In a aircraft propeller engine

46
Q

What are toothed wheel gears?

A

It’s a shaft with multiple gears on to be able t select the gear ratio you desire

47
Q

What are driving-key-type gears?

A

When a load of gears are set on two shafts that are constantly engaged and a spring loaded key selects the ratio it desires

48
Q

What is a infinitely variable rotational speed?

A

A machine that allows you to pick any rotational speed you desire within its speed range

49
Q

What are friction gears?

A

The driving friction wheel is movable so the rotational speed is infinitely variable

50
Q

What is a cone pulley drive?

A

A device that is infinitely variable by adjusting the pulleys to move the belt resulting in different speed

51
Q

If an aircraft doesn’t have fly-by-wire then what is its primary transmission component?

A

Cables

52
Q

What forces can cables transmit?

A

Pulling

53
Q

What forces can push rods transmit?

A

Push and pull

54
Q

If you adjust a push rod what must you check for?

A

To see threads in the witness hole

Mod 6 (17 decks)

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