QUESTION 5
(a)  State TWO causes of excessive noise in a pressure pumped water system, and give a
remedy for each.
 Cause         
 Remedy
           
 Cause         
 Remedy
           
 
(2 marks)
(b)  Give TWO reasons why a pump or a pressure system may continue to stop and start
whether or not water is being used, and give a remedy for each.
 Reason         
 Remedy
           
 Reason         
 Remedy
           
 
(4 marks)
(c)  State TWO methods of automatically controlling the water level in a supply tank from a
pumped system.
 1         
       
 2         
       
 
(2 marks)

(d)  Explain what is meant by the term positive suction head in a pump system.
         
       
 
(1 mark)
(e)  State the purpose of a foot valve on a suction line and explain why it is required.
 Purpose         
 
 Explanation         
       
 
(2 marks)
(f)  Name ONE type of pump best suited for each of the following situations on a water supply.   
 (i)  A pump required for suction and pumping.
   
 (ii)  A pump installed at water level and required to pump water only.
         
       
 
(1 mark)
Total 12 marks

Linkback: https://www.plumbers.nz/plumbing-exam-june-2007/23/question-5/173/