The gas evolved in sewers is________________?

Related Mcqs:

1. The most efficient cross-section of sewers in a combined sewerage system is________________?

   A. Parabolic
   B. Circular
   C. Rectangular
   D. New egged

2. In sewers the gas generally found, is_________________?

   A. Hydrogen sulphide (H2S)
   B. Carbon dioxide (CO2)
   C. Methane (CH4)
   D. All the above

3. The gas which may cause explosion in sewers, is_________________?

   A. Carbondioxide
   B. Methane
   C. Ammonia
   D. Carbon monoxide

4. The rational formula for peak drainage discharge, was evolved by_________________?

   A. Fruhling
   B. Lloyd David
   C. Kuichling
   D. All of these

5. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?

   A. Chezy
   B. Manning
   C. Bazin
   D. Kutter

6. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?

   A. Kinchling
   B. Lloyd Davis
   C. Frubling
   D. All the above

7. Cement concrete sewers are only suitable if non-scouring velocity is between_________________?

   A. 2.5 to 3.0 m/sec
   B. 3.0 to 4.0 m/sec
   C. 3.5 to 4.5 m/sec
   D. 4.5 to 5.5 m/sec

8. Large diameter sewers subjected to external pressure alone, are reinforced ______________________?

   A. Near the inner surface of the pipe
   B. Near the outer surface of the pipe
   C. Both A. and B.
   D. With elliptical cage

9. The gradient of sewers depends upon_________________?

   A. Velocity of flow
   B. Diameter of the sewer
   C. Discharge
   D. All the above

10. In sewers the velocity of flow should not be_________________?

    A. More than the self-cleansing velocity
    B. Less than the self-cleansing velocity
    C. Less than 10 m/sec
    D. More than 20 m/sec