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281.

A good trap should

A.	not have self cleaning property	B.	restrict the flow of water
C.	provide an adequate water seal at all times	D.	all of these

282.

Ventilation of house drainage is required to

A.	relieve the pressure of foul gases	B.	dilute the fould air in the drain
C.	reduce the obnoxious effect of foul air	D.	all of these

283.

In one pipe system of plumbing,

A.	only one pipe is provided	B.	the main pipe is connected directly to the drainage system
C.	all of the traps are fully ventilated and connected to the ventilation pipe	D.	all of the above

284.

In one pipe system of plumbing, waste water is carried away from

A.	bath rooms	B.	kitchens
C.	wash basins	D.	all of these

285.

The pipe through which liquid waste carrying human excreta flows, is called

A.	waste pipe	B.	soil pipe
C.	vent pipe	D.	all of these

286.

A pipe used to carry discharge from sanitary fittings like bathrooms, kitchens etc, is called

A.	waste pipe	B.	soil pipe
C.	vent pipe	D.	anti-siphonage pipe

287.

A pipe installed for ventilation purpose is called

A.	waste pipe	B.	soil pipe
C.	vent pipe	D.	anti-siphonage pipe

288.

The pipe installed in the house or building drainage to preserve the water seal of a trap is called anti-siphonage pipe.

Right

Wrong

289.

Which of the following statement is wrong?

A.	The water closets should be such that excreta do not stick to it	B.	The trap prevents the entry of foul gases.
C.	The trap should have self cleaning velocity	D.	The water closet is provided for receiving garbage.

290.

The anti-siphonage pipe is not required in

A.	one pipe system	B.	two pipe system
C.	single stack system	D.	none of these