With storage, strength of cement
Increases
Decreases
Remains the same
None to these
Correct Answer :
B. Decreases
Related Questions
Asbestos cement
Is brittle
Warps due to changes in humidity
Strength is lowered when saturated by water
All of the above
Pegmatite is a/an
Intrusive igneous rock
Extrusive igneous rock
Sedimentary rock
Metamorphic rock
The nominal size of the modular brick is
190 mm × 90 mm × 80 mm
190 mm × 190 mm × 90 mm
200 mm × 100 mm × 100 mm
200 mm × 200 mm × 100 mm
The main constituent which imparts hydraulicity to hydraulic lime is
Calcium oxide
Silica
Clay
Water
The compound of Portland cement which contributes to the strength after two to three years is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino ferrite
Pick up the correct statement from the following:
Bull's trench kiln a trench excavated in ground
Hoffman's kiln is constructed over ground
Tunnel Kiln is constructed as a tunnel
All the above
Lime putty
Is made from hydraulic lime
Is made by adding lime to water
Can be used only upto three days
All of above
Pick up the hypabyssal rock from the following:
Granite
Dolerite
Basalt
All the above
Cement paints usually
Contain hydrated lime
Contain 5% to 10% colour pigments
Contain 5% sodium chloride
All the above
Advantage of a clamp compared to a kiln for burning bricks is that
It takes less time for burning
It gives more output of first class bricks
It has less initial cost
It is suitable when bricks are required in large numbers
Fibre boards can be
Distempered
Painted
Painted and distempered
Used for furniture
In paints, the pigment is responsible for
Durability
Colour
Smoothness
Glassy face
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
The portion of a brick cut to form angles other than right angles in plan, is known as
Queen closer
King closer
Closer
Squint brick
If the iron ore contains clay as an impurity, the flux added during calcination, is
Clay
Lime stone
Argillaceous iron ore
All the above
The most fire resistant paints are:
Enamel paints
Aluminium paints
Asbestos paints
Cement paints
The yield strength and tensile strength of low carbon steel may be improved by the addition of
Manganese
Chromium
Nickel
Vanadium
Pig iron is manufactured from the ores by
Dressing
Calcination and roasting
Smelting
All the above
The usual percentages of clay and metal in cermet are:
50%, 50%
60%, 40%
70%, 30%
80%, 20%
Second class bricks
Are of dark brown colour
Produce a metallic sound when struck
Are well burnt
Are under burnt
Minimum of 40% of iron, is available in
Magnetite
Red haematite
Limonite
Black band
Which of the following represents a metamorphic rock? (i) Slate (ii) Shale (iii) Quartzite The correct answer is
Only (iii)
Both (i) and (iii)
Both (ii) and (iii)
All (i), (ii) and (iii)
Asbestos
Is a natural fibrous mineral substance
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Contains iron oxide and alumina
All the above
Pick up the correct statement from the following:
Roasting is not necessary if iron ore is an oxide
Impurities float on the molten iron as slag
The slag contains lime about 45%
All the above
Pick up the incorrect statement from the following:
Plastics are chemical resistant
Plastics are durable
Plastics are ductile
Plastics are excellent electric insulators
Acrylic is the name of
Cellulose resin
Alkyd resin
Methyl methacrylate
Cumarone-indene
The process of mixing clay, water and other ingredients to make brick is known as
Kneading
Moulding
Pugging
Drying
Pick up the synthetic resin from the following:
Urea resin
Phenolic resin
Resorcinol resin
All of these
The standard size of masonry bricks, is
18 cm × 8 cm × 8 cm
19 cm × 9 cm × 9 cm
20 cm × 10 cm × 10 cm
21 cm × 11 cm × 11 cm
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark