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221.

Wrought iron pipes are more costly and are

less

222.

The valve provided on the suction pipe in a tube well is

A.	sluice valve	B.	air relief valve
C.	pressure relief valve	D.	reflux valve

223.

A pressure relief valve is provided to prevent

A.	the water flowing out of the suction pipe	B.	the back flow, when the pump is stopped
C.	the increase of pressure after certain safe limit	D.	all of the above

224.

A valve which allows the water to flow in one direction but prevents its flow in the reverse direction, is known as

A.	sluice valve	B.	reflux valve
C.	air relief valve	D.	pressure relief valve

225.

The corrosion in pipe is due to

A.	dissolved oxygen in water	B.	pH value of water
C.	impurities in the material particularly those having a lower potential	D.	all of the above

226.

The type of joint to be used in pipes depends upon the

A.	material of pipe	B.	internal pressure
C.	conditions of support	D.	all of these

227.

The plain ends of cast iron pipes are joined by

A.	spigot and socket joint	B.	flanged joint
C.	victuallic joint	D.	dresser coupling joint

228.

The pipe joint commonly used in pumping stations is

A.	flexible joint	B.	flanged joint
C.	expansion joint	D.	spigot and socket joint

229.

In order to control the flow of water through pipes, a

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

230.

In order to prevent water to flow back in opposite direction, we shall use a

A.	scour valve	B.	air valve
C.	gate valve	D.	reflux valve