The low voltage porcelain is mainly used for
Switch block
Insulating tubes
Lamp sockets
All of these
Correct Answer :
D. All of these
Related Questions
A stone is rejected if it absorbs water more than
5 %
10 %
15 %
20 %
Number of bricks required for one cubic metre of brick masonry is
400
450
500
550
Hydraulic lime is obtained by
Burning of lime stone
Burning of kankar
Adding water to quick lime
Calcination of pure clay
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
Wrought iron contains carbon upto
0.25 %
1.0 %
1.5 %
2 %
Pick up the correct statement from the following:
The heating of a material to redness in contact with air, is known as calcination
The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting
The product that remains after calcination of limestone, is called lime
All the above
In a mortar, the binding material is
Cement
Sand
Surkhi
Cinder
Brittleness of cold is due to an excess of
Sulphur
Carbon
Phosphorus
Silicon
Cross cut saw is used for
Cutting soft stones
Cutting hard stones
Cutting large blocks of stones
Dressing stones
Formula for quick lime, is
CaCO3
Ca(OH)2
CO3CO2
None to these
A first class brick when immersed in cold water for 24 hours should not absorb water more than
15 %
20 %
22 %
25 %
Proper amount of entrained air in concrete results in (i) Better workability (ii) Better resistance to freezing and thawing (iii) Lesser workability (iv) Less resistance to freezing and thawing The correct answer is
(i) and (ii)
(i) and (iv)
(ii) and (iii)
(iii) and (iv)
In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as
English bond
Double Flemish bond
Zigzag bond
Single Flemish bond
Pick up the correct statement from the following:
Solder material is an alloy which melts at a temperature above 400°C
Brazing is done at temperature above 600°C to 1100°C
Brazing joint is stronger than the solder joint
All the above
If the ore impurities is
Clay, lime stone is used as flux
Lime stone, clay is used as flux
Quartz, lime stone and argillaceous iron ores are used as flux
All the above
For filling cracks in masonry structures, the type of bitumen used, is
Cut-back bitumen
Bitumen-emulsion
Blown bitumen
Plastic bitumen
Portland pozzolana cement possesses
Higher resistance to chemical attack
Lower heat of hydration
Lower shrinkage on drying
All the above
Pick up the correct statement from the following:
Rusting is caused due to combined action of air, moisture and carbon dioxide
During rusting, first ferrous bicarbonates are formed
On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
All the above
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
Compared to mild steel, cast iron has (i) High compressive strength (ii) High tensile strength (iii) Low compressive strength (iv) Low tensile strength The correct answer is
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
The rocks which are formed due to pouring of magma at the earth's surface are called
Plutonic rocks
Hypabyssal rocks
Volcanic rocks
Igneous rocks
Pick up the correct statement from the following:
For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
For thin structures which remain continuously under water, the watercement ratio by weight should be 0.55
All the above
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
A ferrous metal is
Cast iron
Wrought iron
Steel
All the above
Red short iron cracks when bent due to the presence of
Sulphur
Carbon
Phosphorus
Silicon
Dorry's testing machine is used for
Crushing test of stone
Hardness test of stone
Impact test of stone
Water absorption test
The presence of sand in brick earth prevents:
Cracking of bricks
Shrinkage of bricks
Warping of bricks
None of these
Kaolin is chemically classified as
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
Vanadium steel is generally used for
Railway switches and crossing
Bearing balls
Magnets
Axles and springs
The hardest rock is
Marble
Diamond
Talc
Quartz