A. acts as deoxidiser
B. reduces the grain size
C. decreases tensile strength and hardness
D. lowers the toughness and transverse ductility
E. increases hardness
Related Mcqs:
- Tungsten in steel________________?
A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. raises its melting point - Sulphur in pig iron tends to make it___________________?
A. hard’
B. soft
C. ductile
D. tough
E. malleable - The presence of sulphur in pig iron makes__________________?
A. it easily machinable
B. it brittle
C. it hard
D. the casting unsound
E. increases the fluidity - Sulphur content in diesel oil should not be more than_________________?
A. 10%
B. 5%
C. 1%
D. 0.1%
E. 0.01% - Which is not correct statement about effect of sulphur in fuel ___________________?
A. it has heating value
B. it helps in electrostatic precipitation of ash in flue-gases
C. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
D. it erodes furnace walls
E. none of the above - Sulphur in coal results in___________________?
A. causing clinkering and slagging
B. corroding air heaters
C. spontaneous combustion during coal storage
D. facilitating ash precipitation
E. all of the above - Sulphur content of fuels is very important to the plant operators because it____________________?
A. has high heating value
B. retards electric precipitation
C. promotes complete combustion
D. has highly corrosive effect
E. facilitates ash removal - Mild steel belongs to the following category___________________?
A. low carbon steel
B. medium carbon steel
C. high carbon steel
D. alloy steel
E. special steel - Machining properties of steel are improved by adding___________________?
A. sulphur, lead, phosphorous
B. silicon, aluminium, titanium
C. vanadium, aluminium
D. chromium, nickel
E. lubricants - Cyaniding is the process of________________?
A. dipping steel in cyanide bath
B. reacting steel surface with cyanide salts
C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. obtaining cyanide salts
E. making corrosion resistant steel
