Environmental Engineering (3160611) MCQs

MCQs of Collection of sewage

Showing 21 to 30 out of 33 Questions
1 2 3 4
21.

The pressure exerted by

(a)

the sewage when running full from inside, is called internal pressure
(b)

the internal pressure if any, causes tensile stress in the pipe material
(c)

pressure sewers are designed to be safe in tension
(d)

All the above.
Answer:

Option (d)

22.

A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

(a)

2.30 m
(b)

2.40 m
(c)

2.45 m
(d)

2.50 m.
Answer:

Option (c)

23.

Pick up the correct statement from the following :
(a)

Maximum daily flow = 2 times the average daily flow
(b)

Maximum daily flow =  x average daily flow
(c)

Sewers are designed for minimum permissible velocity at minimum flow
(d)

All the above.
Answer:

Option (d)

24.

Pick up the incorrect statement from the following :
(a)

The mixture of water and waste products, is called sewage
(b)

The treated sewage effluents, are generally used for irrigating the crops
(c)

The process of collecting, treating and disposing off the sewage, is called sewerage
(d)

The old convergency system was definitely better than water carried sewerage system
Answer:

Option (d)

25.

Pick up the correct statement from the following :

(a)

Small sewers are cleaned by flushing
(b)

Medium sewers are cleaned by cane rodding
(c)

Medium sewers may be cleaned by pills
(d)

All of Above
Answer:

Option (d)

26.

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.
Answer:

Option (a)

27.

The grit chambers of sewage treatment plants, are generally cleaned after

(a)

2 Days
(b)

5 Days
(c)

7 Days
(d)

14 Days
Answer:

Option (d)

28.

The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
(a)

20 mm
(b)

30 mm
(c)

40 mm
(d)

50 mm
Answer:

Option (d)

29.

In very first stage of decomposition of the organic matter in sewage

(a)

ammonia is formed.
(b)

carbondioxide is formed
(c)

nitrates are formed
(d)

nitrites are formed
Answer:

Option (a)

30.

If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
(a)

1.39 m
(b)

1.49 m
(c)

1.59 m
(d)

1.69 m
Answer:

Option (d)

Showing 21 to 30 out of 33 Questions
1 2 3 4