# BSNL JTO (CE) Paper 2009 with Solutions Explanations at Doorsteptutor. Com Part 8

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42. A u-tube manometer is arranged as shown in figure below to measure the pressure difference between point and point in a pipeline conveying water of density . The density of the manometer fluid is . The pressure difference between A and B when is (take

a.

b.

c.

d.

43. A rectangular channel has a width of . the channel carries a discharge of with depth of water of .

At certain section in the channel, it is proposed to construct a smooth hump. The maximum height of the hump

that can be constructed without any change in the upstream depth of the channel is

a.

b.

c.

d.

44. Head loss between section A and B of a circular pipe of a diameter is . The average velocity of flow is and Darcy՚s frictional coefficient is . The length of the pipe between section A and B is

a.

b.

c.

d.

45. What is the population equivalent of a city if the average sewage from the city is , and the average day BOD is ? Assume that per capita of sewage per day .

a.

b.

c.

d.

46. The mixed liquor suspended solids (MLSS) concentration in the aeration tank of activated sludge process is . If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of , then the sludge volume index would be nearly

a.

b.

c.

d.

47. If the population of a city is , and average water consumption is , then the capacity of the pipe mains should be

a.

b.

c.

d.

48. For a water sample having a total hardness of as and alkalinity of as , the carbonate hardness and non-carbonate hardness are respectively

a.

b.

c.

d.

49. A water having pH = 9 will have OH concentration equal to

a.

b.

c.

d.

50. The chlorine demand of a water sample was found to be . The amount of bleaching powder

Containing available chlorine to be added to treat one litre of such a water sample is

a.

b.

c.

d.

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