WAEC 2015 Auto Body Repair & Spray Painting Past Questions and Answers (Paper 2&3

WAEC 2015 Auto Body Repair & Spray Painting Past Questions and Answers (Paper 2&3), WAEC 2015 Auto Body Repair & Spray Painting Past Questions and Answers (Paper 2&3)

PAPER 2

Question 1

     (1) (a) (i) List three sources of accident in the workshop
(ii) List three materials used to extinguish fire in the workshop
(b) State the function of each of the following:
(i)  body jack;
(ii) comma dolly
(c) (i) List two types of maintenance carried out on workshop equipment
(ii) Explain one of the maintenance listed in (c) (i)

Observation

All the candidates that attempted these questions did very well, except for the few who did not know the answer to question (b) (ii): the function of comma dolly.

(b) (ii) Comma dolly is used, with files, to repair complex damaged areas of auto body.

Question 2

(2) (a) State the purpose of each of the following heat treatment processes: (i) Tempering; (ii) Normalizing.

(b) (i) What is a ferrous metal? (ii) List two types of steel used in auto body construction.

(c) State two differences between oxygen and acetylene cylinders used in gas welding.

Observation

The Candidates did well on this question number. However, some of the candidates could not satisfactorily answer the questions asked in 2(b)(ii) and (c).

Solution

(b)   (ii)     Two Types of Steel Used in Auto Body Construction

• – Carbon steel;
• – Alloy steel;
• – Cold-forming steel;
• – Free-cutting steel;
• – Spring steel;
• – Rust-resistant steel;
• – Stainless steel.

(c)              Two Differences between Oxygen and Acetylene Gas Cylinders

• – Oxygen cylinders are painted black or blue while acetylene cylinders are painted maroon or red.
• – While the valves of oxygen gas cylinders are right threaded, those acetylene gas cylinders are left threaded.
• – Oxygen gas cylinders have smaller diameters.
• – Oxygen gas cylinders are longer.
• – The hose of oxygen cylinder is painted black, while that of acetylene cylinder is painted red.

Question 3

(3) (a) (i) List two classes of accident. (ii) Explain each of the classes listed in 3(a)(i)

(b) State two important areas where aluminium is used.

(c) List two important machines used in auto body repair.

Observation

The Candidates did well on this question number. However, some of the candidates could not satisfactorily answer the questions asked in 3 (c).

Solution

(c) Three Machines Used in Auto Body Repair

• – Jack
• – Guillotine
• – Chassis alignment jig
• – Wheeling machine
• – Pneumatic sanders
• – Spraying machine
• – Rolling machine
• – Drilling machine
• – Swagging machine
• – Cone-rolling machine

Question 4

(a) (i) List three types of vehicle body construction
(ii) Explain two of the types listed in 4(a)(i).

(b) State three merits of mild steel.

Observation

 The Candidates did well on question 4 (a) but could not satisfactorily answer the questions asked in 4 (b).

          Solution

(b)  Three Merits of Mild Steel

• – It is easily welded together.
• – It is very cheap.
• – It is very durable.
• – It is always available in various forms

Question 5

(a) List three constituents of paint.

(b) State two causes of spray fog.

(c) With the aid of a sketch, show: (i) correct spray pattern; (ii) heavy centred pattern.

Observation

    (a)       Three Constituents of Paint

• – Pigment;
• – Binder;
• – Solvent (thinner) and
• – Additives.

(b)  Two Causes of Spray Fog

• – Over atomization of the paint
• – Too thin a paint
• – Wrong use of spray gun

(c)  The Sketches of Correct and Heavy-Centred Spray Pattern

PAPER 3

Question 1

  The following materials were supplied:

(a) mild steel sheet metal 300 mm 220 mm 18SWG;

(b) mild steel sheet metal 300 mm 220 mm 18 SWG;

(c) mild steel bracket 120 mm 60 mm 18 SWG and
(d) one tie-on label.

The sketch below shows the assembly view of a longitudinal runner joined to a chassis frame by a bracket. Using the materials supplied, produce the component.