The slump recommended for mass concrete is about
25 mm to 50 mm
50 mm to 100 mm
100 mm to 125 mm
125 mm to 150 mm
Correct Answer :
A. 25 mm to 50 mm
Related Questions
Pig iron is manufactured from the ores by
Dressing
Calcination and roasting
Smelting
All the above
The melting point of silica is:
1570°C
1630°C
1730°C
1850°C
Bitumen is generally obtained from
Organic material
Synthetic material
Petroleum product
Coal
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
Initial setting of cement is caused due to
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
Plywood is obtained by gluing wooden sheets at
100 to 150 N/cm2
100 to 130°C
Both (A) and (B)
Neither (A) nor (B)
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
The age of a tree can be known by examining
Cambium layer
Annular rings
Medullary rays
Heart wood
In a rock calcium carbonate predominates. State whether it is:
Siliceous rock
Argillaceous rock
Calcareous rock
None of these
In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
Split easily
Are affected by moisture
Both (A) and (B)
None of these
Based on flow quality, the sequence of pipes is
A.C. pipes, G.I. pipes, C.I. pipes, PVC pipes
C.I. pipes, G.I. pipes, A.C. pipes, PVC pipes
C.I. pipes, G.I. pipes, PVC pipes, A.C. pipes
None of these
The steel which contains fissures and cavities, is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
Wrought iron contains carbon upto
0.25 %
1.0 %
1.5 %
2 %
Duco paints are
Plastic paints
Cellulose paints
Emulsion paints
Oil paints
Pick up the correct statement from the following:
The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
The silica in excess makes the cement stronger but its setting time also increases
The excess amount of alumina weakens the cement
All the above
Pick up the metal refractory from the following:
Molybdenum
Tungsten
Zirconium
All of these
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark
Study the following statements. (i) Hydraulic lime is suitable for white washing, (ii) Fat lime is suitable for whitewashing, (iii) Hydraulic lime is suitable for making mortar, (iv) Fat lime is suitable for making mortar. The correct answer is
(i) and (iv)
(ii) and (iii)
(i) and (ii)
(iii) and (iv)
The variety of pig iron used for the manufacture of steel by Bessemer process, is
Bessemer pig
Grey pig
White forge pig
Mottled pig
Percentage content of silica in window glass, is
40 to 45
50 to 55
60 to 65
70 to 75
Spirit varnish generally consists of
Oil, wax and resin
Alcohol, wax and turpentine
Pigment and synthetic resin
Spirit and shellac
Pug mill is used for
Preparation of clay
Moulding of clay
Drying of bricks
Burning of bricks
Pick up the correct statement from the following:
The free quartz suddenly expands at a temperature lower than 600°C
The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2
The sand stone with silicates resist a fire in a better way
All the above
The percentage of alumina and silica in good fire clay vary respectively is
25, 75
30, 70
35, 65
All of these
Seasoning of timber is done for
Increasing moisture content
Decreasing moisture content
Increasing strength of timber
None to these
Distemper is
A paint consisting of powdered chalk, pigments and water
A water proofing agent
A paint consisting of coloured cement and water
A drying agent
Asbestos is
Corrugated sheet used for roofing
An incombustible fire proof material
An organic substance
All the above
Invar contains
12% of nickel
24% of nickel
30% to nickel
36% of nickel
The wedging is adopted for quarrying costly stratified rock such as
Laterite
Marble
Limestone
All the above
Galvanising means covering iron with a thin coat of
Tin
Zinc
Glaze
Coal tar