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211.

A sluice valve, in water distribution system, is used to

A.	protect the pipe against negative pressure	B.	regulate the flow of water through the pipe
C.	prevent water to flow back in the opposite direction	D.	all of tha above

212.

A reflux valve, in water distribution system, is used to

A.	protect the pipe against negative pressure	B.	regulate the flow of water through the pipe
C.	prevent water to flow back in the opposite direction	D.	all of the above

213.

A reflux valve is also known as

A.	safety valve	B.	scour valve
C.	air valve	D.	check valve

214.

A scour valve, in a water distribution system, is provided at

A.	low points	B.	high points
C.	junction points	D.	all of these

215.

If the level of source of water is higher than that of the place of consumption, the system adopted for supplying water is

A.	pumping system	B.	gravitational system
C.	combined pumping and gravity system	D.	any one of these

216.

When high level spots are not available for the construction of ground level reservoirs, elevated reservoirs can be used.

Agree

Disagree

217.

Flush type fire hydrants remain standing above the road.

Correct

Incorrect

218.

The hydrants are used for tapping waer from mains for

A.	fire extinguishing	B.	street washing
C.	flushing sewer lines	D.	all of these

219.

The minimum size of a fire hydrant is

A.	5 cm	B.	10 cm
C.	15 cm	D.	20 cm

220.

Which of the following statement is correct?

A.	The pumping system is the best system of water distribution.	B.	A sluice valve prevents water to flow back in the opposite direction
C.	In a ring system, there is one main supply pipe.	D.	all of the above