The percentage of alumina in a good brick earth lies between________________?
A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%
Month: January 2019
Percentage of silica in a good brick earth lies between_______________?
Percentage of silica in a good brick earth lies between_______________?
A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%
Excess of alumina in brick earth makes the brick______________?
Excess of alumina in brick earth makes the brick______________?
A. impermeable
B. brittle and weak
C. to lose cohesion
D. to crack and warp on drying
The age of a tree can be known by examining_________________?
The age of a tree can be known by examining_________________?
A. cambium layer
B. annular rings
C. medullary rays
D. heart wood
Crushing strength of a first class brick should not be less than_____________?
Crushing strength of a first class brick should not be less than_____________?
A. 3.5 N/mm2
B. 7.0 N/mm2
C. 10.5 N/mm2
D. 14.0 N/mm2
The practical limit of moisture content achieved in air drying of timber is________________?
The practical limit of moisture content achieved in air drying of timber is________________?
A. 5%
B. 15%
C. 25%
D. 35%
The trunk of tree left after cutting all the branches is known as_______________?
The trunk of tree left after cutting all the branches is known as_______________?
A. log
B. batten
C. plank
D. baulk
Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is_________________?
Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is_________________?
A. 0°
B. 30°
C. 45°
D. 90°
A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
A. 15%
B. 20%
C. 22%
D. 25%
The main function of alumina in brick earth is_______________?
The main function of alumina in brick earth is_______________?
A. to impart plasticity
B. to make the brick durable
C. to prevent shrinkage
D. to make the brick impermeable