17) For laying pipes the width of the trench will be _____ more than the external diameter of the pipe
Answer is:
30 cm to 45 cm
Related ISRO Technician-B Plumber Question Paper - 2017 (Set - 1) with Answer Key
Answer is:
100 cm
Answer is:
All of these
Explanation:
Objective of water treatment is
* To remove the dissolved gases
* To remove the unpleasant and objectionable testes and colors from the water
* To eliminate the tuberculation and corrosive properties