Engineering :: Concrete Technology

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251.

The diameter of the pipe line used for transportation of concrete by pumps should not exceed

A.	10 cm	B.	20 cm
C.	30 cm	D.	40 cm

252.

To prevent segregation, the concrete should not be thrown from a height of more than

A.	1/2 m	B.	1 m
C.	1.5 m	D.	2 m

253.

The placement of concrete should be discontinued during rainy periods

Yes

254.

The concrete

should

should not

255.

The placing of concrete should start width-wide in reinforced cement concrete slabs from one end.

True

False

256.

The process of consolidating concrete mix after placing it in position is termed as

A.	curing	B.	wetting
C.	compaction	D.	none of these

257.

When the concrete mix is too wet, it causes

A.	segregation	B.	low density
C.	excess laitance at the top	D.	all of these

258.

The factor which effect the quality of compaction, is

A.	density of concrete	B.	strength of concrete
C.	durability of concrete	D.	all of these

259.

For compacting large sections of mass concrete in structures, the type of vibrator used is

A.	internal vibrator	B.	screed vibrator
C.	both (a) and (b)	D.	either (a) or (b)

260.

For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is

A.	internal vibrator	B.	screed vibrator
C.	form vibrator	D.	all of these