Assignment Task

Question 1.

1.1 Draw a neat sketch of a gearbox in first gear with all the relevant labels.

1.2 Explain in the correct sequence, the power flow in a gearbox which is connected in first gear (sketches may be used).

1.3 Give one reason for the necessity of the use of a synchronising ring in a gearbox.

1.4 What is meant by the term ‘hygroscopic’, when referring to brake fluid?

1.5 Which law in science is based on the principle of equal pressure in all directions, as used in the hydraulic braking systems?

1.6 Give two reasons for the necessity of replacing brake drums of which the wall thickness is too thin. 

1.7 Draw three neat sketches illustrating the operation of the Pintle nozzle from closed to fully open.

1.8 State one advantage of a torsion bar suspension when compared with a short-and long arm suspension.

1.9 Draw a neat sketch of a Hotchkiss drive with all the relevant labels. 

Question 2.

2.1 Give five points on each of the following strokes.

2.1.1 Delivery stroke.

2.1.2 Idling stroke.

2.2 Read the following sentence and fill in the missing words.

A (a) __________ is measured in (b) ___________ and never exceeds 2 degrees. It may be (c) ____________ on independent suspensions by placing the upper (d) ________ slightly to the rear of the (e) __________ members.

2.3 Name the function of the caster. 

2.4 Is following sentence ‘true or false’. The advantage of the compensator is that if an ant joint or cable breaks, the emergency handbrake will be partially or completely disabled.

2.5 Give two good reasons why the correct castor angle is a necessity. 

Question 3.

3.1 Draw two neat sketches illustrating the difference between positive castor and zero castor.

3.2 Give two means by which the bearing pre-load on the differential carrier bearings can be altered. 

3.3 Name five types of steering boxes.

3.4 Read the following sentence and only fill in the missing words. Two types are in common use, a (a)_______ and double type, the latter being (b)___________ of the single type and more commonly used. 

3.5 Name two types of balancing done, when doing wheel balancing.

3.6 Choose only ‘true or false’ in the following sentence.

3.7 The push rods force the brake shoes inwards against the spring tension to contact the brake drum. 

Question 4.

4.1 Various means are adopted in dynamic wheel balancing machines, name two factors that will be adopted when using these machines.

4.2 State three functions of the gearbox.

4.3 State three functions of the synchroniser unit as used in gearboxes.

4.4 What is the purpose of steering clutches on certain earth-moving machinery?

4.5 Give four reasons for gears grating when changing gears in a synchro-mesh gearbox.

4.6 State four advantages a good hydraulic brake fluid should have.

4.7 Name three types of brake shoe arrangements used in motor vehicles.