1. In a falling head permeability test the initial head of 1.0 m dropped to 0.35 m in 3 hours, the diameter of the stand pipe being 5 mm. The soil specimen was 200 mm long and of 100 mm diameter. The coefficient of permeability of the soil is:

 

• 4.86 x 10 -5 cm/s
• 4.86 X 10 -6 cm/s
• 4.86 x 10 -7 cm/s
• 4.86 x 10 -8 cm/s

 

2. In a lined rectangular canal, the Froude number of incoming flow is 3.0. A hydraulic jump forms when it meets the pool of water. The depth of flow. after the jump formation is 1.51 m. Froude number of flow after the hydraulic jump is:

 

• 0.30
• 0.71
• 0.41
• none of the above

 

 

3. A pump can lift water at a discharge of 0.15 m 3/s to a head of 25 m. The critical cavitation number ( s c ) for the pump is found to be 0.144. The pump is to be installed at a location where the barometric pressure is 9.8 m of water and the vapour pressure of water is 0.30 m of water. The intake pipe friction loss is 0.40 m. Using the minimum value of NPSH (Net Positive Suction Head), the maximum allowable elevation above the sump water surface at which the pump can be located is:

  

  (A) 9.80 m

  (B) 6.20 m

  (C) 5.50 m

  (D) none of the above

 

 4.During a 6- hour storm, the rainfall intensity was 0.8 cm/hour on a catchment of area 8.6 km 2. The measured runoff volume during this period was 2,56,000 m 3. The total rainfall was lost due to infiltration, evaporation, and transpiration (in cm/hour) is

 

• 0.80
• 0.304
• 0.496.
• sufficient il1fonnation not available

 

5. The rainfall on five successive days in a catchment were measured as 3, 8, 12,6, and 2 cms. If the total runoff at the outlet from the catchment was 15 cm, ,the value of the f -index (in mm/hour) is

 

• 0.0
• 1.04
• 1.53
• sufficient information not available

 

6. A canal was designed to supply the irrigation needs of 1200 hectares of land growing rice of 140 days base period having a Delta of 134 cms. If this canal water is used to irrigate wheat of base period 120 days having a Delta of 52 cm, the area (in Hectares) that can be irrigated is:

 

(A) 2650

(B) 3608

(C) 543

(D) none of the above

 

7. For a water treatment plant having a flow rate of 432 m 3/hr, what is the required

plan area of a Type I settling tank to remove 90% of the particles having a settling velocity of 0.12 cm/sec is

 

(A) 120 m 2

(B) 111 m 2

(C) 90 m 2

(D) 100 m 2

8. The theoretical oxygen demand of a 0.001 mol/L glucose solution is

 

(A) 180 mg/L

(B) 192 mg/L

(C) 90 mg/L

(D) 96 mg/L

 

 

9. waste water sample has an initial BOD of 222 mg/L. The first order BOD decay coefficient is 0.4/day. The BOD consumed (in mg/L) in 5 'days is:

 

• 150
• 192
• 30
• 50

 

10. car is moving at a speed of 72 km/hr on a road having 2% upward gradient. The driver applies brakes when he sees an obstruction. If his reaction time is 1.5 seconds, assuming that the co-efficient of friction between the pavement and tire as 0.15, calculate the distance traversed before the car finally stops.

 

• 24 m
• 150 m
• 1056 m
• 324 m

 

11. The average daily traffic on a stretch of road is 300 commercial vehicles per lane per day. Design traffic repetitions for 10 years when vehicle damage factor is 2,5 and traffic growth rate is 7%, is .

 

• 3.8 msa
• 23.5 msa
• 45.4 msa
• 16 msa

 

 

12. In a concrete pavement

• temperature stress is tensile at bottom during day time
• load stress is compressive at bottom

 

(A) Both the statements (a) and (b) are correct

(B) Statement (a) is correct and (b) is wrong.

(C) Statement (b) is wrong and (a) is correct

(D) Both statements (a) and (b) are incorrect