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Environmental Engineering Unit 3

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.

Which of the following is not a method of water distribution?

a)

Gravity system

b)

Pumping system

c)

Combined system

d)

Vacuum system

2.

In a grid iron system, dead ends are:

a)

Absent

b)

Frequent

c)

More

d)

Unavoidable

3.

Which layout is best suited for towns with roads originating from a central point?

a)

Circular system

b)

Radial system

c)

Dead end system

d)

Grid iron system

4.

Water supply to a house begins with the connection of the service pipe with municipal water mains. The connection sequence compromises

a)

1,2,3,4

b)

3,1,2,4

c)

1,2,4,3

d)

3,2,1,4

5.

The intermittent system of supply is objectionable because:

a)

Water is wasted

b)

Contamination enters pipes

c)

Head losses increase

d)

Unequal distribution occurs

6.

Continuous supply system provides water for:

a)

8 hrs/day

b)

12 hrs/day

c)

16 hrs/day

d)

24 hrs/day

7.

What is the IS Code of practice for water supply in buildings?

a)

IS 1172-1993

b)

IS 2065-1983

c)

IS 800-2007

d)

IS 383-1970

8.

Which statement is correct with reference to Grid Iron water distribution system?

a)

Suitable for well planned towns & cities

b)

Requires less number of sluice valves

c)

Cost of construction is low

d)

All of the above

9.

Which type of valve is provided to stop the flow of water?

a)

Sluice valve

b)

Scour valve

c)

Check valve

d)

Air valve

10.

Air valves are located at:

a)

Dead ends

b)

Low points

c)

Summit points

d)

Near hydrants

11.

Scour valves are located at:

a)

Low points

b)

Summit points

c)

Dead ends

d)

Service reservoirs

12.

Which of the following IS Code is used for the basic requirements for water supply, drainage, and sanitation?

a)

IS 456

b)

IS 1035 (Part 32)

c)

IS 10500 (2012)

d)

IS 1172:1993

13.

A dead end system is mostly adopted in:

a)

New towns

b)

Old towns with irregular roads

c)

Metropolitan cities

d)

Grid planned cities

14.

Radial system is generally suitable for:

a)

Villages

b)

Cities with circular roads

c)

Towns with central main source

d)

Small towns only

15.

Which system provides uniform pressure and quick service during fire?

a)

Radial

b)

Dead end

c)

Grid iron

d)

Circular

16.

Service reservoirs are provided to:

a)

Store storm water

b)

Maintain pressure

c)

Treat water

d)

Remove impurities

17.

Which type of valve prevents backflow in water mains?

a)

Gate valve

b)

Air valve

c)

Check valve

d)

Scour valve

18.

Which valve is used to isolate sections of pipeline for repair?

a)

Sluice valve

b)

Check valve

c)

Air valve

d)

Pressure valve

19.

Among the available four distribution systems, which system is called as reticulation system?

a)

Grid iron system

b)

Dead end system

c)

Ring system

d)

Radial system

20.

Which pipe material is most durable for distribution mains?

a)

PVC

b)

Cast iron

c)

RCC

d)

GI

21.

A 1 MLD water supply equals:

a)

1000 m³/day

b)

10,000 m³/day

c)

100 m³/hr

d)

41.7 m³/hr

22.

Water hammer in pipelines is due to:

a)

Slow closing of valves

b)

Rapid closing of valves

c)

Excess pressure head

d)

Leakage

23.

Which distribution system requires the least maintenance?

a)

Grid iron

b)

Circular

c)

Dead end

d)

Radial

24.

The distribution system of water supplies is designed in the basis of

a)

Peak hourly demand

b)

Coincident draft

c)

Average daily demand

d)

Greater of A and B

25.

Which of the following is not a type of water distribution system in water supply?

a)

Only II

b)

Neither I or II

c)

Both I or II

d)

Only I