# While applying the Rational formula for computing the design discharge, the rainfall duration is stipulated as the time of concentration because

1.   this leads to the largest possible rainfall intensity

2.   this leads to the smallest possible rainfall intensity

3.   the time of concentration is the smallest rainfall duration for which the Rational formula is applicable

4.   the time of concentration is the largest rainfall duration for which the Rational formula is applicable

4

this leads to the largest possible rainfall intensity

Explanation :
No Explanation available for this question

# The plan area of a reservoir is 1 km2. The water level in the reservoir is observed to decline by 20 cm in a certain period. During this period the reservoir receives a surface inflow of 10 hectare-meters, and 20 hectare-meters are abstracted from the reservoir for irrigation and power. The pan evaporation and rainfall recorded during the same period at a near by meteorological station are 12 cm and 3 cm respectively. The calibrated pan factor is 0.7. The seepage loss from the reservoir during this period in hectare—meters is

1.  0.0

2.  1.0

3.  2.4

4.  4.6

4

4.6

Explanation :
No Explanation available for this question

# Match the following: Group-I Group-II P.Rainfall intensity 1.Isohytes Q.Rainfall excess 2.Cumulative rainfall R.Rainfall Averaging 3.Hyetograph S.Mass curve 4.Direct runoff hydrograph The correct match is: P Q R S

1.  1 3 2 4

2.  3 4 1 2

3.  1 2 4 3

4.  3 4 2 1

4

3 4 1 2

Explanation :
No Explanation available for this question

# Settling test on a sample drawn from Aeration Tant liquor of ASP (MLSS = 2800 mg/1) was carried out with 1 litre sample. The test yielded a settled volume of 200 ml. The value of Sludge Volume Index shall be:

1.  14.0

2.  34.2

3.  179

4.  358

4

14.0

Explanation :
No Explanation available for this question

# Results of water sample analysis are as follows: Cation Concentration(mg/I) Equivalent Weight Na+ 40 23 Mg+ 10 12.2 Ca+ 55 20 K+ 2 39 (milliequivalent weight of CaCO3=50mg/meq).Hardness of the water sample in mg/1 as CaCO3 is

1.  44.8

2.  89.5

3.  179

4.  358

4

179

Explanation :
No Explanation available for this question

# An ideal horizontal flow settling basin is 3m deep having surface area 900 m2. Water flows at the rate of 8000 m3/d, at water temperature 200C (m = 103kg/m.s) and ρ = 1000 kg/m3). Assuming Stokes law to be valid, the proportion (percentage) of spherical sand particles (0.01 mm in diameter with specific gravity 2.65), that will be removed, is

1.   32.5

2.  67

3.  87.5

4.  95.5

4

87.5

Explanation :
No Explanation available for this question

# Match the following: Group-I Group-II (Characteristic of sewage discharged Into inland waters) (Allowable limit,mg/1) P.BOD5 1)250 Q.COD 2)30 R.Oil and Grease 3).20 S.Total Suspended Solids 4).10   5).5   6).3 The correct match is: P Q R S

1.  2 5 4 2

2.  4 1 6 4

3.  3 1 4 2

4.  2 1 6 3

4

2 1 6 3

Explanation :
No Explanation available for this question

# Match the following: Group-I Group-II (Type of water impurity) (Method of treatment) P.Hardness 1) Reverse Osmosis Q.Brackish water from sea 2) Chlorination R.Residual MPN from filters 3).Zeolite Treatment S.Turbidity 4).Coagulation and Flocculation   5). Coagulation, Flocculation  and Filtration P Q R S

1.  1 2 4 5

2.  3 2 2 4

3.  2 1 3 5

4.  3 1 2 5

4

3 2 2 4

Explanation :
No Explanation available for this question

# The design speed for a National Highway is 100kmph. If the maximum permissible superelevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be

1.  260 m

2.  315 m

3.  380 m

4.  410 m

4

315 m

Explanation :
No Explanation available for this question

1.  30 m

2.  35 m

3.  38 m

4.  42 m

4