The type of steel used for precision levelling staff, is
Titanium steel
Carbon steel
Invar
Stainless steel
Correct Answer :
C. Invar
Related Questions
Refractory bricks are used for
Retaining walls
Columns
Piers
Combustion chambers
Good quality cement contains higher percentage of
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
For light and ornamental casting, the most unsuitable pig iron, is
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
Pick up the correct statement from the following:
In stone arches, the stones are placed with their natural beds radial
In cornices, the stones are placed with their natural beds as vertical
In stone walls, the stones are placed with their natural beds as horizontal
All the above
A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
Slate
Plank
Board
Strip
Initial setting of cement is caused due to
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
The sequence of refractory materials according to increasing melting points is:
Dolomite, Magnesia, Bauxite, Chromites
Bauxite, Chromites, Dolomite, Magnesia
Magnesia, Bauxite, Dolomite, Chromites
None of these
Inner part of a timber log surrounding the pitch, is called
Sapwood
Cambium layer
Heart wood
None to these
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
Grey cast iron
White cast iron
Mottled cast iron
Toughed cast iron
Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
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 cooling of magma at a considerable depth from earth's surface are called
Plutonic rocks
Hypabyssal rocks
Volcanic rocks
Igneous rocks
The initial setting time of hydraulic lime, is
30 minutes
60 minutes
90 minutes
120 minutes
Oil varnish generally consists of
Synthetic resin and spirit
Oil, wax and resin
Resin, oil and turpentine
Spirit, oil and wax
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
The most important tool in brick laying for lifting and spreading mortar and for forming joints is
Trowel
Square
Bolster
Scutch
Water paint is a
White wash
Colour wash
Whiting
All the above
Geologically, marble is known as
Sedimentary rock
Igneous rock
Metamorphic rock
Stratified rock
Commonly used thinner in
Lacquer paints, is alcohol
Cellulose paints is ethyl acetate
Oil paints, is naphtha
All the above
For high grade instruments the steel preferred to, is
Cast steel
Bessemer steel
Mild steel
Whitworth compressed steel
Upto a maximum of 72% of iron, is available in
Magnetite
Limonite
Siderite
Iron pyrites
Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:
Absence of sun light
Dampness
Presence of sap
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
The steel used in R.C.C. work is
Stainless steel
Mild steel
High carbon steel
Wrought iron
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
Which of the following trees yields hard wood?
Deodar
Chir
Shishum
Pine
Which of the following should be used for hearting of thicker walls?
Headers
Stretchers
Brick bats
Queen closer
Chlorite, a green colour mineral is mainly derived from the decomposition of
Augite
Biotite
Hornblende
All of these