Waste Water Engineering Questions

• Kjedahl nitrogen is a mixture of
• In sewers the velocity of flow should not be
• Traps
• Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R) : It helps to accommodate the scum in the septic tank.
• 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
• The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
• The maximum depth of sedimentation tanks, is kept
• The detention time (t) of a settling tank, may be defined as the time required for
• The most effective arrangement for diverting excess storm water into a natural drainage, is
• For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
• Pick up the correct statement from the following :
• The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
• Discrete or granular particles change their
• 'Cowl' is provided at
• Large diameter sewers subjected to external pressure alone, are reinforced
• The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
• During putrifaction process of sewage the gas given off, is
• A well oxidized sewage contains nitrogen mainly as
• The sewerage system originates from
• The gas evolved in sewers is