#### Water Supply Engineering

1

S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is

A.  S_2 - S_1 = (2.3 Q)/(pi t) log _10  t_2/t_1
B.  S_2 - S_1 = (2.3 Q)/(4pi t) log _10  t_2/t_1
C.  S_2 - S_1 = (2.3 Q)/(4pi t) log _10  t_2/t_1
D.  S_2 - S_1 = (2.3 Q)/(4pi t) log _10  t_1/t_2

2

For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is

A.  t_2 = r_2/r_1 xx t_1
B.  t_2 =( r_2/r_1)^2 xx t_1
C.  t_2 = (r_2/r_1)^3 xx t_1
D.  t_2 =( r_2/r_1 ) t_1^2
E. none of these.

3

If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula Q = 1135 ( P/5 + 10)  is suggested by

A. National Board of fire under-writers
B. Freeman
C. Kuichling
D. None of these.

4

Grade aqueducts are not allowed to run

A. full
B. 3/4 th full
C. 1/2 full
D. 1/4th full

5

The formula  H_L = (n^2 V^2 .L)/(R^(4//3))  for the head loss in conduits is generally known as

A. Hazen-William's formula
B. Manning's formula
C. Darcy-Weisbach formula