NSC Civil Technology Civil Services Sewerage drainage system design: Answer the following questions w

Question

Answer the following questions with regard to the drainage structure in FIGURE 3.1.

3.1.1 What is the structure called?  
3.1.2 Briefly describe how the organic matter decomposes in the structure.  
3.1.3 What is the purpose if the inlet pipe opening at 3.1.B?  
3.1.4 Briefly motivate why the inflow at 3.1.B must be lower than the liquid level.  
3.1.5 To which structure is the effluent at 3.1.D discharged?  
3.2 Briefly describe the disadvantageous effects in a drain system when it is not equipped with a ventilation pipe.  
3.3 Make a neat sketch to illustrate the construction of an 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?  
3.6 Briefly describe what an indirect water supply system is.  
3.7 What is the water supply pipe from the water service point to the dwelling called?  
3.8 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?  
3.10.2 Give ONE example where this type of tap must be installed.

Answer the following questions with regard to the drainage structure in FIGURE 3.1 - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1

Worked Solution & Example Answer:Answer the following questions with regard to the drainage structure in FIGURE 3.1 - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1

3.1.1 What is the structure called?

3.1.2 Briefly describe how the organic matter decomposes in the structure.

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

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

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

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

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

3.4 Identify the correct answer in each of the following descriptions of the drain test methods.

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

3.6 Briefly describe what an indirect water supply system is.

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

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

3.10.1 What is this type of tap called?

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

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