NSC Civil Technology Civil Services Cold water pipe systems and installation: 3.1 What is the structure called

Question

3.1 What is the structure called?
1. Septic tank

3.1.2 Briefly describe how the organic matter decomposes in the structure.
1. It digests and liquefies through anaerobic bacteria and other biological life such as maggots and worms.

3.1.3 What is the purpose if the inlet pipe opening at 3.1.B?
1. To allow wastewater to enter the tank for proper treatment.

3.1.4 Briefly motivate why the inflow at 3.1 B must be lower than the liquid level.
1. To prevent backflow and allow effective waste treatment within the septic tank.

3.1.5 To which structure is the effluent at 3.1.D discharged?
1. It is usually discharged to a leach field for further treatment.

3.2 Briefly describe the disadvantageous effects in a drain system when it is not equipped with a ventilation pipe.
1. It may cause suction or pressure issues that can lead to water lockout in traps.

3.3 Make a neat sketch to illustrate the construction of an S-trap.
1. (Insert sketch of S-trap)

3.4 Identify the correct answer in each of the following descriptions of the drain test methods. Write only the correct word next to the number in the ANSWER BOOK.
3.4.1 The mirror and torch test check that the drain pipe is STRAIGHT / SEALED.
3.4.2 The ball of the ball test must be 10 mm / SLIGHTLY SMALLER than the diameter of the pipe.
3.4.3 If the drop in the water level is greater than 16 mm / 6 mm, the pipe probably has a leak.

3.5 What is the purpose of the conduit pipes in an electrical system?
1. To protect electrical cables from damage.

3.6 Briefly describe what an indirect water supply system is.
1. A system where water is supplied to a dwelling through a storage tank and distributed throughout.

3.8 What is the water supply pipe from the water service point to the dwelling called?
1. User pipe.

3.9 Indicate whether the following statements with regard to solar heating systems are TRUE or FALSE. Write only the word 'true' or 'false' next to the number in the ANSWER BOOK.
3.9.1 The hot water of the independent solar heating system is stored in the geyser.
3.9.2 The tray of the solar heating system is coated with an isolation material.
3.9.3 The inside of the tray of the solar heating system is coated with white paint to reflect the sun's rays.
3.9.4 The best position for the sun collector is due east.
3.9.5 Photovoltaic cells can also be used to heat the water.

3.10 Answer the following questions with regard to the tap in FIGURE 3.10.
3.10.1 What is this type of tap called?
1. Stop cock.

3.10.2 Give ONE example where this type of tap must be installed.
1. Before geysers, cisterns, storage tanks, or at the water service point.

3.1 What is the structure called? 1 - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1

Worked Solution & Example Answer:3.1 What is the structure called? 1 - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1

What is the structure called?

Briefly describe how the organic matter decomposes in the structure.

What is the purpose if the inlet pipe opening at 3.1.B?

Briefly motivate why the inflow at 3.1 B must be lower than the liquid level.

To which structure is the effluent at 3.1.D discharged?

Briefly describe the disadvantageous effects in a drain system when it is not equipped with a ventilation pipe.

Make a neat sketch to illustrate the construction of an S-trap.

The mirror and torch test check that the drain pipe is:

The ball of the ball test must be:

If the drop in the water level is greater than:

What is the purpose of the conduit pipes in an electrical system?

Briefly describe what an indirect water supply system is.

What is the water supply pipe from the water service point to the dwelling called?

Indicate whether the following statements with regard to solar heating systems are TRUE or FALSE.

What is this type of tap called?

Give ONE example where this type of tap must be installed.

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