21.

22,

23.

24,

25.

26.

21.

28.

Which method of analysis of water distribution system is most suitable for long and narrow
pipe system?

{A) Circle method ര Hardy Cross Method

(C) Equivalent Pipe method ` (D) Electrical Analysis method

For disinfecting water supply, it is required to treat 500,000 litres of daily supply with
0.5 ppm of chlorine. If the disinfectant is available in the form of bleaching powder contaiing
30% of available chlorine, the amount of bleaching powder required to treat the daily flow വ്‌
water 18 :

(കു 0.833 kg 08. 0.916 ‏ينا‎

(©) 0918 kg (D) None

In water treatment settling unit, water having a temperature of 20 Degree Centigrade
carries solid particles with average diameter of 0.05 mm and specific gravity 1.20. Given
» = 1.01 centi stokes. Settling velocity of settling particles is :

(ಗಿ) 0.027 ಊ/೬ (B) 3.1 mm/s
(© 2.73 ५/8 (D) 0.21 mm/s

A main sewer is to be designed to receive a flow from 1 km? area of a community where the
population density is 200 persons/ha. The average sewage flow is 150 110705 7೧೯ 087118.
per day. Assume peak factor ='3. The design flow for the main sewer is :

(^) 7.934 71104 ∎ (8) 8.13 एष्‌

(0) 10.0 "एष्‌ ` (D) 9.0mlpd
At shut off head of a centrifugal pump, the discharge is :

(ക Maximum (18) Zero

(೧) Rated Discharge (1) None

The minimum dissolved oxygen which should always be present in water in order to save
aquatic life is :

[ക 1ppm ∎ (B) 40 ppm
(© 4ppm (D) 10 ppm
In the case of surface water with a pH range of 6 to 8, which is the most suitable coagulant :
(ക) കന (B) Quick lime
(C) Lime (D) Potassium Permanganate

The pipe joint commonly used in pumping station are :
(ക) Flexible joint. (18) Expansion joint
(C) Flanged joint (D) Socket and spigot joint

028/2016 6 A