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Imi automotive level 2 > Driveline and transmission. > Flashcards

Driveline and transmission. Flashcards

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1
Q

What are the three main shafts in a rear-wheel drive gearbox?

A

Input shaft.
Output shaft.
Secondary shaft.

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2
Q

What shaft accommodates the reverse gear?

A

Auxiliary shaft.

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3
Q

How are the input and output shafts separated on a rear-wheel drive gearbox?

A

A taper roller bearing.

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4
Q

Where are the input and output shafts on a rear-wheel drive gearbox, relative to each other?

A

In line with each other.

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5
Q

How are gears selected?

A

By moving the synchro hub sleeve.

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6
Q

How are gear ratios determined?

A

The number of teeth on the engaged gear wheels.

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7
Q

Which gears are the result of a compound gear train on a rear-wheel drive gearbox?

A

All the gears except the fourth.

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8
Q

What is the fourth gear a result of on a rear-wheel drive gearbox?

A

Direct drive.

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9
Q

Which shafts rotate when a rear-wheel drive gearbox is in neutral?

A

The input and secondary shafts rotate.

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10
Q

What happens to the output shaft when a rear-wheel drive gearbox is in neutral?

A

The output shaft does not rotate, but the gears do.

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11
Q

How is lubrication and cooling done in the gearbox?

A

It is done by the gear wheels splashing oil.

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12
Q

What is the ratio called between the rotational speeds of the input shaft and the output shaft?

A

The gear index.

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13
Q

How is a gear index calculated?

A

Gear index = number of teeth(bottom) / number of teeth(top) or gear index = rotational speed(in) / rotational speed(out).

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14
Q

How do you work out the rotational speed of the output shaft?

A

Divide the rotational speed of the input shaft by the gear index.

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15
Q

What is the forth gear ratio?

A

1:1.

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16
Q

What is the difference between reverse gear selection compared to the selection of other gears?

A

It has:
Strait cut teeth.
It slides into gear.
The gear is not synchronised using a synchro hub.

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17
Q

How many gears does it take to have a gear?

A

At least two gear wheels.

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18
Q

What are the main gears that make up a gear index?

A

Driving gear wheel.
Driven gear wheel.

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19
Q

What can transmission affect?

A

Rotational speed.
Torque.
Directional rotation.

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20
Q

What is the ratio between the rotational speed of the drive gear and the driven gear called?

A

Gear ratio.

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21
Q

When a gear ratio is referred to by a decimal number, it is called a?

A

Gear index.

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22
Q

What are the types of gears in a gearbox?

A

Spur and helical.

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23
Q

Does the stud wheel effect the gear ratio?

A

No.

24
Q

Which gear wheel has the highest rotational speed?

A

The one with fewer teeth.

25
Q

What does dividing the input rotational speed with the gear index give?

A

The output rotational speed.

26
Q

If a gear index is greater than one it is a?

A

Reduction.

27
Q

Why is a dual transmission used?

A

To get greater gear ratios. It can be looked at as two separate transmissions.

28
Q

How do you get the total gear index?

A

The individual gear indexes are multiplied.

29
Q

What happens when changing into a higher gear?

A

The engine speed drops.

30
Q

What happens when changing to a higher gear?

A

The engine speed drops.

31
Q

What is the effect of excessive free play?

A

Makes it difficult to disengage the clutch / clutch drag.

32
Q

What is the effect of insufficient free play?

A

Clutch slip.

33
Q

What would cause a whine which disappears when the clutch is depressed?

A

Worn clutch release bearing.

34
Q

What makes up the cultch release mechanism?

A

Cable, pressure plate, release bearing and pedal.

35
Q

What is the effect of air in the hydraulic clutch system?

A

It is difficult to engage the clutch / clutch drag.

36
Q

What is the cause of clutch slip?

A

Insufficient free play.

37
Q

What is the cause of clutch drag?

A

Excessive free play.

38
Q

What is the cause of clutch judder?

A

Clutch plate torsional spring is broken, worn engine mounting.

39
Q

What clutch component drives the gearbox?

A

Clutch friction plate.

40
Q

What is the purpose of the interlock?

A

To stop two gears from engaging at once.

41
Q

When in fifth gear what rotates faster the output or input shaft?

A

The output shaft.

42
Q

How are gears connected to the shafts?

A

They are not they are free to rotate.

43
Q

What gears are used on a sliding mesh gearbox?

A

Spur gears.

44
Q

What would cause a crashing sound when selecting a gear?

A

A worn synchromesh.

45
Q

How do you calculate the overall transmission ratio?

A

Times the gearbox ratio by the final drive ratio.

46
Q

What is meant by a hypoid axle?

A

When the pinion is off set to the centre line of the crown wheel.

47
Q

What would be a typical final drive ratio?

A

3:1 to 4:1.

48
Q

What vehicle would a fully floating axle be used on?

A

Light commercial vehicle.

49
Q

What test would be carried out to test a CV joint?

A

A road test using left and right hand lock.

50
Q

What part of the transmission would fail an MOT?

A

CV joint and boot.

51
Q

A vehicle has a fully floating axle, true or false, a broken axle shaft will not cause the wheel to fall off?

A

True.

52
Q

What are three advantages of a diaphragm clutch over a multi-coil spring clutch?

A
  1. Lower pedal force required.
  2. Clamping force does not reduce as the clutch centre plate wears.
  3. It is lighter and more compact.
53
Q

Why do clutch friction plates have a spring hub?

A

For smooth clutch engagement.
To reduce torsional vibrations.

54
Q

Why would you use helical gears over spur gears?

A

They are quieter and can carry a greater load.

55
Q

Why does a baulk ring / synchro cone have a screw type finish?

A

To disperse oil film and prevent baulking.

56
Q

What bearing does a differential use?

A

Tapered roller bearing.

Imi automotive level 2 (2 decks)

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