Which of the following bricks are used for lining of furnaces?
Over-burnt bricks
Under-burnt bricks
Refractory bricks
First class bricks
Correct Answer :
C. Refractory bricks
Related Questions
The slenderness ratio for masonry walls should not be more than
10
20
30
40
Soundness test of cement determines
Quality of free lime
Ultimate strength
Durability
Initial setting
The portion of the brick without a triangular corner equal to half the width and half the length, is called
Closer
Queen closer
King closer
Squint brick
Hydraulic lime is obtained by
Burning of lime stone
Burning of kankar
Adding water to quick lime
Calcination of pure clay
Which one of the following polymers is obtained from condensation polymerization?
Phenol formaldehyde
Carbamide
Melamine-formaldehyde
All of these
The most durable varnish is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
Pick up the rock which is not a sedimentary rock from the following:
Gravel
Sand stone
Gypsum
Dolerite
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
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
Index number expressing the relative sizes of both coarse and fine aggregates, is called
Proportioning of aggregates
Fineness modulus
Grading of aggregates
None of these
Plastic bitumen is generally used for
Road pavements
Expansion joints
Crack fillings
None to these
Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below:
Both A and R is true and R is correct explanation of A
Both A and R is true and R is not a correct explanation of A
A is true but R is false
A is false but R is true
The minimum compressive strength of 2nd class bricks should be
75 kg/cm2
90 kg/cm2
100 kg/cm2
120 kg/cm2
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
Which of the following cements contains maximum percentage of dicalcium silicate?
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
Brittleness of cold is due to an excess of
Sulphur
Carbon
Phosphorus
Silicon
Rapid hardening cement contains
Tri-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino-ferrite
Di-calcium silicate
Soundness of cement is tested by
Vicat's apparatus
Le-chatelier apparatus
Compressive strength testing apparatus
None of these
For testing compressive strength of cement, the size of cube used is
50 mm
70.6 mm
100 mm
150 mm
The kiln which may work throughout the year, is
Clamp
Bull's kiln
Hoffman's kiln
None of these
In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is
Right angles
45°
60°
Parallel
Granite is not suitable for ordinary building purpose because
It cannot be polished
It is not a fire proof material
It is costly
It has less crushing strength
Pick up the correct characteristic of Pyroxene from the following:
It forms octagonal crystals
It converts to chlorine by hydration
Its density is 2.3 to 3.6 g/cm2
All the above
Based on its dry weight, a freshly felled tree may contain water
25 %
50 %
75 %
100 %
The normal curing period for lime mortar, is:
1 day
3 days
7 days
10 days
Cast steel is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
The hardest rock is
Marble
Diamond
Talc
Quartz
A first class brick when immersed in cold water for 24 hours should not absorb water more than
15 %
20 %
22 %
25 %
Gneiss is obtained from
Igneous rocks
Metamorphic rocks
Sedimentary rocks
Sedimentary metamorphic rocks
Which of the following should be used for hearting of thicker walls?
Headers
Stretchers
Brick bats
Queen closer