Waste Water Engineering

61. For drains up to 15 cumecs, the depth 'd' and width 'B' are related by

1. d = 0.2 B
2. d = 0.5 B
3. B = 0.2 d
4. B = 0.5 d

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62. For efficient working of a sewer, it must be ensured that

1. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
2. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
3. Both (a) and (b)
4. Neither (a) nor (b)

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63. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

1. Kinchling
2. Lloyd Davis
3. Frubling
4. All the above

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64. For evaporation and measurement of settable solids, the apparatus used, is

1. A jar
2. A breaker
3. A test tube
4. An Imhoff cone

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65. For house drainage minimum gradient is

1. 1 in 60
2. 1 in 80
3. 1 in 10
4. 1 in 400

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66. For large sewers, maximum distance between manholes may be

1. 50 m
2. 100 m
3. 200 m
4. 300 m

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67. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

1. 100 cm
2. 120 cm
3. 140 cm
4. 160 cm

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68. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

1. Cast iron sewers
2. Cement concrete sewers
3. Glazed bricks sewers
4. Stone ware sewers

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69. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

1. Should be sunk by 20 cm
2. Should be kept 20 cm above the adjacent portion
3. Should be sunk by 50 cm
4. Need not be sunk

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70. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

1. 1.5
2. 2
3. 2.5
4. 3

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