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241.

For batching 1 : 2 : 4 concrete mix by volume, the ingredients required per bag of cement are

A.	50 kg of cement : 70 kg of fine aggregate : 140 kg of coarse aggregate	B.	50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate
C.	50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate	D.	50 kg of cement : 100 litres of fine aggregate : 200 litres of coarse aggregate

242.

For measuring aggregates by volume, wooden batch boxes known as farmas are used.

Correct

Incorrect

243.

The measuring 50 litres of aggregate, the inner dimensions of a farma should be

A.	25 cm x 25 cm x 40 cm	B.	29 cm x 29 cm x 48 cm
C.	30 cm x 30 cm x 50 cm	D.	31 cm x 31 cm x 52 cm

244.

The finished concrete is measured in litres.

Right

Wrong

245.

The mixer, which produces a steady stream of concrete as long as it is in operation, is known as

A.	non-tilling batch mixer	B.	tilting type batch mixer
C.	continuous mixer	D.	none of these

246.

The process of mixing, transporting, placing and compacting the cement concrete should not take more than

A.	30 minutes	B.	60 minutes
C.	90 minutes	D.	120 minutes

247.

For continuous transportation of concrete, the method used is

A.	transport of concrete by pans	B.	transport of concrete by wheel barrows
C.	transport of concrete by belt concrete conveyors	D.	transport of concrete by pumps

248.

For concreting of tunnel lining, the concrete is transported by

A.	pumps	B.	pans
C.	wheel barrows	D.	containers

249.

The concrete can be lifted by pumps through a maximum vertical distance of

A.	10 m	B.	20 m
C.	30 m	D.	50 m

250.

In transportation of concrete by pumps

A.	the slump should not be less than 50 mm and more than 80 mm	B.	the water cement ratio should remain between 0.5 to 0.65
C.	the number of bends in a pipe line should be as small as possible	D.	all of the above