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211.

According to Khosla's theory, the exit gradient in the absence of a downstream cut-off is

A.	zero	B.	unity
C.	infinity	D.	none of these

212.

A hydraulic jump is formed when

A.	a sub-critical flow strikes against a super-critical flow	B.	a super-critical flow strikes against a sub-critical flow
C.	the two flows of super-critical velocity meet each other	D.	the two flows of sub-critical velocity meet each other

213.

For low navigation dams, the type of gate used is

A.	rolling gate	B.	bear trap gate
C.	vertical lift gate	D.	drum gate

214.

Trough stage of river is most suitable location for diversion head works.

Yes

215.

A canal head work in rocky stage of a river is not suitable because

A.	more cross drainage works are required	B.	a costly head regulator is required
C.	more falls are necessary to dissipate the energy	D.	all of the above

216.

The crest level in a barrage is kept at a

A.	low	B.	high
C.	moderate

217.

The crest of the under-sluices should be lower than the crest of the head regulator (if silt excluder is provided by at least

A.	1 to 1.2 m	B.	1.8 to 2 m
C.	2 to 2.5 m	D.	4 to 5 m

218.

The opening in the weir wall with a crest at low level on the canal side is known as under sluice or scouring sluice.

Correct

Incorrect

219.

The function of a scouring sluice is

A.	to control the silt entry into the canal	B.	to scour the silt deposited in the river bed above the approach channel
C.	to pass the low floods without dropping the shutters of the main weir	D.	all of the above

220.

The smooth entry, the regulators are aligned at an angle of

A.	60?	B.	80?
C.	110?	D.	130?