A. D
B. 1.25 D
C. 1.5 D
D. 1.75 D
Related Mcqs:
- If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?
A. 1.250 D
B. 1.350 D
C. 1.425 D
D. 1.625 D - If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
A. D²
B. D²
C. D²
D. D² - If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?
A. D’ = 0.64 D
B. D’ = 0.74 D
C. D’ = 0.84 D
D. D’ = 0.94 D - If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is___________________?
A. 1045 mm
B. 1065 mm
C. 1075 mm
D. 1095 mm - The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?
A. 1.095
B. 1.085
C. 1.075
D. 1.065 - In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
A. Is only provided
B. Is doubled
C. Is trebled
D. Is not enough - The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?
A. d² (0.011d + 0.785H)/Q
B. d (0.022d + 0.085H)/Q
C. d (0.785d + 0.011H)/Q
D. d (0.285d + 0.011H)/Q - If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
A. /2
B. /4
C. /3
D. D - 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 - The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?
A. 0.9 cm
B. 1.2 m
C. 1.5 m
D. > 1.5 m
