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 Posted: Tue Aug 12th, 2008 02:21 am
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David
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Mana: 
Sounds to me like you all need to go on a training course in physics

David:D

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 Posted: Tue Aug 12th, 2008 02:11 am
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Tim
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Mana: 
Weetabix wrote:

...the volume of fluid in the OFFSIDE wheel cylinder is LARGER, therefore the force applied at the brake pedal can push the NEARSIDE wheel cylinder further for the same effort.

Is the correct answer:D

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 Posted: Tue Aug 12th, 2008 02:08 am
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kev1975
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Mana: 
Rebel wrote: Sorry but I have to agree with Dubsy.

The volume of the cylinder makes no difference, It's the cross sectional diameter of the piston which determines the force.

A larger diameter piston will cause greater pedal travel but more force at the piston.

Hence the brakes should pull to the right.

that was my answer when i did my ntt & scored full marks in the brakes section , so it must be right :D

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 Posted: Tue Aug 12th, 2008 12:07 am
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Rebel
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Mana: 
Sorry but I have to agree with Dubsy.

The volume of the cylinder makes no difference, It's the cross sectional diameter of the piston which determines the force.

A larger diameter piston will cause greater pedal travel but more force at the piston.

Hence the brakes should pull to the right.

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 Posted: Mon Aug 11th, 2008 11:54 pm
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nicknak
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Mana: 
The answer is they pull to the offside.

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 Posted: Mon Aug 11th, 2008 12:59 pm
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Weetabix
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Mana: 
Dubsy wrote: Hello I was just checking the answers to the test and noticed you put:

3. A car is accidentally fitted with O/S/F wheel cylinders that have pistons 2.0mm GREATER in DIAMETER than the N/S/F wheel cylinders pistons. This is likely to cause ?
C = the brakes to pull to the N/S


How do the brakes pull to the N/S, if the diameter is greater then the force applied will be greater which will result in the brakes pulling to the O/S.

...the volume of fluid in the OFFSIDE wheel cylinder is LARGER, therefore the force applied at the brake pedal can push the NEARSIDE wheel cylinder further for the same effort.

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 Posted: Mon Aug 11th, 2008 10:44 am
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Dubsy
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Mana: 
Hello I was just checking the answers to the test and noticed you put:

3. A car is accidentally fitted with O/S/F wheel cylinders that have pistons 2.0mm GREATER in DIAMETER than the N/S/F wheel cylinders pistons. This is likely to cause ?
C = the brakes to pull to the N/S


How do the brakes pull to the N/S, if the diameter is greater then the force applied will be greater which will result in the brakes pulling to the O/S.

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 Posted: Wed Jun 20th, 2007 01:43 am
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avocco
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Mana: 
Heres the answers for your sample questions, you'll find most of these in the Fundamentals of Mechanics, but not all.


MOT Training - NTTA Sample Questions

Brakes
1. How would you check that a hydraulic braking system vacuum servo is assisting foot brake pedal effort ?
C = feel for an increase in brake pedal movement as the servo vacuum builds up after being emptied.

2. Which one of the following foot brake efficiency ranges should a properly maintained modern four wheeled car
be expected to achieve in an EMERGENCY BRAKING situation on a dry tarmac road ?
B = 80% to 85%

3. A car is accidentally fitted with O/S/F wheel cylinders that have pistons 2.0mm GREATER in DIAMETER than
the N/S/F wheel cylinders pistons. This is likely to cause ?
C = the brakes to pull to the N/S

4. What causes 'sponginess' in a hydraulic braking system ?
A = air in the hydraulic fluid

5. Which one of the following is true about hydraulic brake fluid ?
D = it absorbs water

6. Hydraulic brake fluid ?
C = is virtually incompressible

7. Which one of the following is NOT a type of disc brake calliper ?
C = expanding

8. Which one of the following is true ?
C = brake linings can absorb oil

9. Excessive brake disc 'run-out' indicates that a brake disc is ?
A = buckled

10. Which one of the following does NOT change the braking effectiveness of a car ?
A = wheel cylinder piston length

Steering

11. A track control arm is for ?
B = locating the position of a road wheel

12. What is steering castor ?
C = a steering geometry feature

13. The camber angle setting of a road wheel determines ?
A = the plane of a road wheel in relation to the vertical

14. Steering self centring (or self righting) is mainly produced by ?
D = castor

15. Which unit is a sector shaft a part of ?
B = steering box assembly

16. Which force is a steering column most subjected to in normal use ?
A = torsion

17. Which one of the following determines the amount of steering 'toe out' (Ackerman effect) on locks ?
A = steering arm to stub axle angle

18. What is meant by the term ' over steer ' ?
A = the tendency for a vehicle to steer on a smaller turning circle than is expected

19. Steered wheels tracking adjustment is normally made by ?
D = adjusting track rod length

20. If a steering power assistance pump stops working it will cause ?
C = the steering to feel heavy

Suspension

21. A transverse leaf spring is one which has its greatest length ?
B = across the vehicle

22. A leaf spring 'swinging shackle' is for ?
D = allowing the spring to alter its effective length when flexing

23. A suspension bump stop is for ?
B = limiting suspension vertical movement

24. Which type of shock absorber (damper) is usually used with a MacPherson strut suspension ?
C = telescopic

25. The eye of a leaf spring is for ?
B = attaching a spring to a chassis or body

26. A suspension torsion bar is usually made from ?
B = spring steel

27. When a suspension coil spring is 'coil bound' it usually indicates that ?
A = the spring is over loaded

28. What fluid is normally in hydraulic shock absorbers (dampers) ?
D = oil

29. In which direction does a 'panhard rod' control suspension movement in relation to a vehicle longitudinal axis ?
A = laterally

30. Which one of the following front suspension system must have TWO combined steering & suspension swivel
joints and TWO pivot joints for EACH front wheel ?
C = double wishbone

Wheels and Tyres

31. Which types of tyre construction have the most flexible side walls ?
C = radial

32. What does a tyre 'ply rating' indicate ?
A = load carrying capacity

33. The correct wheel rim diameter for a 185 x 13 size tyre is ?
C = 13 inches

34. Where on a tyre are tread wear indicators located ?
A = in the tread

35. A tyre that is run under inflated will wear more rapidly ?
C = at the tread shoulders

Electrical

36. What is the approximate voltage produced from ONE CELL of a Lead / Acid battery ?
A = 2 volts

37. What minimum fuse rating is needed for a 12 volt circuit with just one 48 watt bulb ?
D = 4.0 Amp

38. For vehicle wiring, the expression "Earth Return" means ?
D = the vehicle body or chassis is a part of the circuit

39. The beam image pattern emitted by some modern headlamps is determined by ?
A = its lens

40. An alternator has a diode rectifier for ?
D = converting output to DC

Body & Corrosion

41. The corrosion process of steel car bodies is known as ?
A = oxidation

42. Steel car bodies can be protected from corrosion by ?
A = galvanising

43. Which metal is most resistant to rusting ?
D = stainless steel

44. The corrosion of mild steel is increased by the addition of ?
D = salt

45. The evidence of corrosion on aluminium and its alloys is seen on the metal as ?
B = a white powder

Exhaust Emissions
46. When a petrol engine is running rich the exhaust gas hydrocarbon (HC) will be ?
A = higher than it should be

47. Petrol is mainly composed of ?
D = carbon and hydrogen

48. The colour of the exhaust gas emitted from a petrol engine that is running very rich is likely to be?
A = black

49. A 4 cylinder petrol engine has an exhaust gas hydrocarbon content of 600 ppm (parts per million). What is the
hydrocarbon content likely to be when a plug lead is removed ?
A = over 900 ppm

50. The CO (carbon monoxide) content of the exhaust gas emitted from a properly maintained non-cat 4 cylinder
petrol engine in good condition is most likely to be ?
A = 3.0%

Exhaust Emissions

51. Which one of the following petrol / air mixtures is closest to the theoretical best for the most complete
combustion in a petrol engine ?
B = 15 air units to 1 petrol unit

52. Which one of the following fuels should be used when there is a catalytic converter in the exhaust system ?
C = 92 octane petrol without any Tetraethyl-lead

53. Which one of the following situations is the correct one for measuring the normal 'in use' exhaust emissions
from a petrol engine ?
C = when the engine coolant water and sump oil are both at normal working temperature

54. Which is the correct procedure when using an exhaust gas analyser for determining the exhaust emissions
from a V6 petrol engine that has two totally separate exhaust systems ?
B = average the readings from the tail pipes

55. Which element in the atmosphere aids combustion ?
D = Oxygen

General
56. An exhaust system expansion box is for ?
B = reducing exhaust noise

57. A petrol engine exhaust system catalytic converter is for ?
A = removing certain harmful exhaust emissions

58. An 'inertia reel' seat belt is one which ?
B = locks to restrict body movement in a head-on collision

59. A 'lap' type seat belt is one which ?
C = has a 2 point mounting

60. Which type of windscreen will crack without shattering ?
B = laminated

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 Posted: Tue Jun 19th, 2007 11:56 pm
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KevG
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Mana: 
Google it?

 

Kev

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 Posted: Thu May 31st, 2007 12:47 am
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Ross K
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Hi

I have recently had our garage approved to carry mot testing, I have been working on cars for over 15 years but have no trade qualfications.

I will have to sit the NTT exam, the man from VOSA said for me to read Hillers the fundimentals of vehicles book 1,  but i have looked on the VOSA site at the sample paper and some of the questions on there I cannot find the answers in the book, is there any other books to read?

Ross

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