76) The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle is

77) Hardy cross method of analysis of distribution system i) involves successive trials ii) takes economic aspects into account iii) is time consuming The correct answer is

78) The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is

79) Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system

80) The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is