NSC Civil Technology Civil Services Basic and advanced technical drawings: Various options are given as pos

Question

Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A-D) next to the question numbers (6.1.1 to 6.1.5) in the ANSWER BOOK, e.g. 6.1.6 C.

6.1.1 Sewage is water that contains ... contaminants.

A    green
B    organic
C    poisonous
D    soapy

6.1.2 A soil vent pipe runs ... from the underground sewerage and allows odours and gases to escape.

A    vertically
B    horizontally
C    diagonally
D    all the above-mentioned

6.1.3 Sewer pipes should be at least ... in diameter.

A    50 mm
B    100 mm
C    150 mm
D    80 mm

6.1.4 Water from sinks, baths and basins is discharged into ...

A    waste pipes.
B    soil pipes.
C    vent pipes.
D    all the above-mentioned.

6.1.5 A soil pipe should be used to join straight lengths of pipes.

A    soil pipe
B    stop end
C    straight joint
D    none of the above.

6.2 FIGURE 6.2 below shows drawings of TWO water traps found in a sewerage system.

6.2.1 Differentiate between A and B by referring to the shape of the traps.

6.2.2 Explain the function of the water at the base of EACH of the fittings in FIGURE 6.2.

6.3 FIGURE 6.3 below is a drawing of the sectional view through part of a building showing the installation of a water closet. Study the drawing and answer the questions that follow.

6.3.1 Identify part A.

6.3.2 Explain how cone B is made out of rubber.

6.3.3 Name ONE tool that you will use to clear a blocked waste pipe that is connected to a basin.

6.3.4 A ball valve is found inside part A in FIGURE 6.3 and regulates the water level. In your ANSWER BOOK, draw a neat line diagram of a ball valve as seen from the direction of A in FIGURE 6.3. Show the following in your drawing:

A    ball
B    lever arm
C    casing with silencing tube

6.4 FIGURE 6.4 on ANSWER SHEET 6.4 is a drawing of a part of a building with sanitary fittings and sewerage components. Use ANSWER SHEET 6.4 and develop an one-pipe sewerage layout for this building on the indicated mandate. All regulations and design principles of a good drainage (sewerage) system must be considered and appropriate symbols and abbreviations must be used.

The drainage system should consist of:

2 x rodding eyes
5 x inspection eyes
1 x ventilation pipe
3 x main sewage pipes
branch pipes.

6.5 FIGURE 6.5 below shows a cross section of a sewerage system. Study the drawing and answer the questions that follow.

6.5.1 Identify the part of the sewerage system in FIGURE 6.5.

6.5.2 Predict ONE consequence of channelling grey water into a septic tank.

6.6 Name ONE situation where you would install a vacuum tank.

6.7 Identify the fitting used in a sewerage system, illustrated in FIGURE 6.7 below.

6.8 Name TWO methods that can be used to join copper pipes.

6.9 Draw a neat line diagram in your ANSWER BOOK to show how two pieces of sheet metal interlocks when you make a grooved seam lap joint.

FIGURE 6.10 below is a drawing of a soldered joint and the forces that act upon it.

6.10.1 Identify forces A and B in FIGURE 6.10.

6.10.2 Give TWO reasons why the contact of a soldering iron on the sheet metal is important while soldering operations are.

Various options are given as possible answers to the following questions - NSC Civil Technology Civil Services - Question 6 - 2019 - Paper 1

Worked Solution & Example Answer:Various options are given as possible answers to the following questions - NSC Civil Technology Civil Services - Question 6 - 2019 - Paper 1