A. A sewer drops from a height
B. A branch sewer joins the main sewer at higher level
C. A lamp is inserted to check obstruction
D. None of these
Related Mcqs:
- A manhole is generally provided at each__________________?
A. Bend
B. Junction
C. Change of gradient
D. All the above - Lead acetate test in sewer manhole is done to test the presence of ____________________?
A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours - If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen - A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?
A. Carbondioxide gas
B. Hydrogen sulphide gas
C. Methane gas
D. Petrol vapours - A manhole is classified as shallow if its depth is between_________________?
A. 0.4 to 0.5 m
B. 0.5 to 0.7 m
C. 0.7 to 0.9 m
D. 0.9 to 1.20 m - If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen - The drop man holes are generally provided in sewers for____________________?
A. Industrial areas
B. Large town ships
C. Hilly town ships
D. Cities in plains - Drop manholes at the junctions of sewer lines, are provided if________________?
A. Invert level of a branch sewer is more than 60 cm that of the main sewer
B. Sewer line runs along a main road
C. Ordinary manhole cannot be built
D. Two sewer lines intersect - Drop manholes are the manholes___________________?
A. Without entry ladders
B. Without manhole covers
C. With depths more than 3.5 m
D. Having drains at different levels - The difference of pressure between the inside and outside of a liquid drop is________________?
A.p = Txr
B.p = T/r
C. p = T/2r
D. p = 2T/r
E. none of the above
