NSC Civil Technology Civil Services Hot water system principles and installation: Choose a description from COLUMN

Question

Choose a description from COLUMN B that matches an item in COLUMN A. Write only the letter (A–L) next to the question numbers (4.1.1 to 4.1.8) in the ANSWER BOOK, e.g., 4.1.9 M.

4.1.1 Stopcock  
4.1.2 Vacuum tube  
4.1.3 Vacuum breaker  
4.1.4 Drain cock  
4.1.5 Safety valve  
4.1.6 Gasket  
4.1.7 Plumbers' tape  
4.1.8 Jumper

State TWO methods that are used to prevent electrolytic reaction.

FIGURE 4.3 below is a picture of a ball valve commonly found in cisterns.

4.3.1 What role does the ball valve play in a cistern?  
4.3.2 Describe how the ball valve functions.

FIGURE 4.4 below is a picture of a pipe fitting.

4.4.1 Identify the pipe fitting.  
4.4.2 Explain the purpose of part A.

Describe how an electronic water-saving shower head works to prevent water wastage.

Draw the following symbols that are used in hot-water systems:  
4.6.1 Storage water heater (domestic type).

The working sequence of a high-pressure geyser is given in random order.  
Analyse and rearrange the steps in logical order. Write ONLY the number corresponding with the statement below another in your ANSWER BOOK.

1. Hot water flows from the geyser outlet to the taps in the bathroom and kitchen.  
2. The thermostat regulates the temperature of the water.  
3. Cold water flows into the geyser through the pressure-control valve.  
4. The element in the geyser heats the water.  
5. Water rises to the top of the geyser while cold water fills the geyser at the bottom.

Differentiate between an air lock and a water hammer in a hot-water installation.

State ONE situation to EACH of the following faults in a plumbing installation:

4.9.1 Hot water flowing from the overflow pipe.  
4.9.2 Poor hot-water pressure.

Differentiate between a solar geyser and a high-pressure electric geyser in terms of its location in a dwelling.

FIGURE 4.11 below shows a machine that is used in the plumbing industry.

4.11.1 Identify the machine.  
4.11.2 Explain the use of the reamer in the machine.  
4.11.3 Why must the foot switch of the machine be locked?

Name the instrument commonly used to unclog/clean a drain system.

Name ONE machine that can be used to clean a blocked drain.

Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Civil Services - Question 4 - 2021 - Paper 1

Worked Solution & Example Answer:Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Civil Services - Question 4 - 2021 - Paper 1

4.1.1 Stopcock

4.1.2 Vacuum tube

4.1.3 Vacuum breaker

4.1.4 Drain cock

4.1.5 Safety valve

4.1.6 Gasket

4.1.7 Plumbers' tape

4.1.8 Jumper

State TWO methods that are used to prevent electrolytic reaction.

4.3.1 What role does the ball valve play in a cistern?

4.3.2 Describe how the ball valve functions.

4.4.1 Identify the pipe fitting.

4.4.2 Explain the purpose of part A.

Describe how an electronic water-saving shower head works to prevent water wastage.

Draw the following symbols that are used in hot-water systems: 4.6.1 Storage water heater (domestic type).

The working sequence of a high-pressure geyser (correct order).

Differentiate between an air lock and a water hammer in a hot-water installation.

4.9.1 Hot water flowing from the overflow pipe.

4.9.2 Poor hot-water pressure.

Differentiate between a solar geyser and a high-pressure electric geyser in terms of its location in a dwelling.

4.11.1 Identify the machine.

4.11.2 Explain the use of the reamer in the machine.

4.11.3 Why must the foot switch of the machine be locked?

Name the instrument commonly used to unclog/clean a drain system.

Name ONE machine that can be used to clean a blocked drain.

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