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Compared to mild steel, cast iron has<br>(i) High compressive strength<br>(ii) High tensile strength<br>(iii) Low compressive strength<br>(iv) Low tensile strength
A
(i) and (ii)
B
(ii) and (iii)
C
(iii) and (iv)
D
(i) and (iv)
Correct Answer:
(i) and (iv)
Calculate ultimate moment and shear of effective span is 30m, live load is 9kn/m, dead load excluding self weight is 2kn/m, load factors for dead load is 1.4 for live load is 1.6 cube strength of concrete fcu is 50n/mm2 cube strength at transfer is fci is 35n/mm2, tensile strength of concrete Ec is 34kn/mm2 loss ratio ɳ is 0.85 and 8mm diameter high tensile strength fpu is 1500n/mm2 are available for use and the modulus of elasticity of high tensile wires is 200kn/mm2?
A
340 and 450kn
B
240 and 340kn
C
140 and 240kn
D
100 and 200kn
Cast iron generally has low tensile strength but excellent compressive strength.
A
True
B
False
The compressive strength of cast iron is __________ that of its tensile strength.
A
Equal to
B
Less than
C
More than
D
None of these
The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A
Same
B
More
C
Less
D
Unpredictable
In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
A
More
B
Less
C
Same
D
More/less depending on composition
White cast iron as compared to grey cast iron is
A
More durable
B
Very brittle
C
Very hard
D
All of the above
Which variety of cast iron is obtained by melting cast iron with wrought iron scrap?
A
Mottled cast iron
B
Chilled cast iron
C
Malleable cast iron
D
Toughened cast iron
In a stress-strain diagram for mild steel, as shown in the below figure, the point ‘A’ represents
A
Elastic limit
B
Upper yield point
C
Lower yield point
D
Breaking point
An important property of malleable cast iron in comparison to grey cast iron is the high
A
Compressive strength
B
Ductility
C
Carbon content
D
Hardness
The ultimate tensile stress for mild steel is __________ the ultimate compressive stress.
A
Equal to
B
Less than
C
More than
D
None of these
