Engineering :: Concrete Technology

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221.

The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.

True

False

222.

If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water-cement ratio is 0.6, the weight of water required for harsh mix is

A.	8 kg	B.	10 kg
C.	12 kg	D.	14 kg

223.

The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately

A.	2 to 3	B.	3 to 4
C.	4 to 5	D.	5 to 6

224.

A mix with water-cement ratio of 0.78 is termed as wet mix.

Yes

225.

The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be

A.	1.25	B.	1.5
C.	2	D.	2.5

226.

In voids method of determining the quantity of cement paste, it is assumed that the

A.	voids in the coarse aggregate are filled by the fine aggregates	B.	volume of fine aggregates required for 1 m3 of coarse aggregate is equal to total voids in coarse aggregate plus 10% aggregate extra to allow for additional voids created by wedging action
C.	volume of cement paste required for 1 m3 of coarse aggregate is equal to total volum of voids in the fine aggregate plus 15% aggregate extra to allow for additional voids created be wedging action	D.	all of the above

227.

The workability of concrete mix increases with the increase in moisture content.

Agree

Disagree

228.

The importance of storing the various ingredients of concrete is

A.	to maintain the uniformity of grading	B.	to maintain the uniformity of moisture
C.	to maintain the strength of materials	D.	both (a) and (b)

229.

The main requirement, which a ware-house should fulfil is that

A.	its walls should be water proof masonry construction	B.	its roof should be leak-proof
C.	it must have large number of windows	D.	its plinth should be very high
E.	Both (a) and (b)

230.

The term 'ware-hourse pack' means

A.	the total capacity of ware-house	B.	packing of ware-house
C.	pressure compaction of bags on lower layers	D.	pressure exertion of bags on upper layers