Invar contains
12% of nickel
24% of nickel
30% to nickel
36% of nickel
Correct Answer :
D. 36% of nickel
Related Questions
Plastic
Is an organic substance
Consists of natural or synthetic binders
Finished products are rigid and stable at normal temperature
All the above
The minimum compressive strength of 1st class bricks should be
75 kg/cm2
90 kg/cm2
100 kg/cm2
120 kg/cm2
Which of the following gradients exerts maximum influence on properties of steel?
Iron
Carbon
Manganese
Sulphur
Pig iron is manufactured from the ores by
Dressing
Calcination and roasting
Smelting
All the above
Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
Lime stone and alumina
Silica and alkalies
Alumina and iron
Alkalies and magnesium
Inner part of a timber log surrounding the pitch, is called
Sapwood
Cambium layer
Heart wood
None to these
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
1 : 2
1 : 3
1 : 4
1 : 6
For a 50 kg cement bag water required, is
16.5 litres
18.5 litres
20.5 litres
22.5 litres
Pick up the correct statement from the following:
Steel produced by open hearth process is milder than that obtained by the Bessemer process
Engineers prefer open hearth steel for structural purpose as it is more homogenous
Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
All the above
Which of the following is the purest form of iron?
Cast iron
Wrought iron
Mild steel
High carbon steel
Which of the following stone is best suited for construction of piers and abutments of a railway bridge?
Granite
Sand stone
Lime stone
Quartzite
Cast iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
Bitumen is generally obtained from
Organic material
Synthetic material
Petroleum product
Coal
Pick up the correct statement from the following:
Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
Cupola furnace is used for the manufacture of cast iron
Red short iron is of no value for welding purpose
All the above
Bulking of sand is caused due to
Surface moisture
Air voids
Viscosity
Clay contents
A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
10 %
15 %
20 %
25 %
Quick setting cement is produced by adding
Less amount of gypsum in very fine powdered form
More amount of gypsum in very fine powdered form
Aluminium sulphate in very fine powdered form
Pozzolana in very fine powdered form
Plywood has the advantage of
Greater tensile strength in longer direction
Greater tensile strength in shorter direction
Same tensile strength in all directions
None of the above
Wrought iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
Oil varnish generally consists of
Synthetic resin and spirit
Oil, wax and resin
Resin, oil and turpentine
Spirit, oil and wax
Priming consists of
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
One part of white lead, 8 parts of chalk and one part of linseed oil
None to these
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
The most commonly used retarder in cement is
Gypsum
Calcium chloride
Calcium carbonate
None of the above
Pick up the correct statement from the following:
Lime is available in Free State
Lime is available by dissolving calcium carbonate in water
Lime is available by calcining calcium carbonate at 900°C
Lime is nothing but calcium chloride
Percentage content of silica in window glass, is
40 to 45
50 to 55
60 to 65
70 to 75
The steel used in R.C.C. work is
Stainless steel
Mild steel
High carbon steel
Wrought iron
Quick lime
Generates heat when added to water
Reacts with carbon dioxide
May be used for white-washing
All the above
Dry rot
Cracks the timber
Reduces the strength of timber
Reduces the timber to powder
Spoils the appearance of timber
The stones obtained by blasting are used as
Ballast in railways
Aggregates for concrete
Road metal
All the above
The pigment used in paints for corrosive resistance, is
White lead
Ferrous oxide
Zinc white
Red lead