A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing
Related Mcqs:
- Vanadium in high speed steels__________________?
A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness - Which of the following constituents of steels is softest and least strong ________________?
A. austenite
B. pearlite
C. ferrite
D. cementlte
E. bainite - The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
A. 770°C
B. 910°C
C. 1050°C
D. below recrystallisation temperature
E. above recrystallization temperature - The basic constituents of Hastelloy are_________________?
A. aluminium, copper etc
B. nickel, molybdenum etc
C. nickel, copper, etc
D. all of the above
E. none of the above - Which of the following is the binding material in cemented carbides___________________?
A. cobalt
B. nickel
C. vanadium
D. iron
E. carbon - Basic constituents of Monel metal are _________________?
A. nickel, copper
B. nickel, molybdenum
C. zinc, tin, lead
D. nickel, lead and tin
E. none of the above - Slow plastic defomiation of metals under a constant stress is known as________________?
A. creep
B. fatigue
C. endurance
D. plastic deformation
E. non-plastic deformation - Grey cast iron_____________________?
A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
C. is produced by annealing process. I is soft, tough and easily machinec metal
D. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
E. none of the above is true - Addition of silicon to aluminium results in____________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above - The correct sequence for descending order of machinability is _____________________?
A. grey cast iron, low carbon steel, wrought iron
B. low carbon steel, grey cast iron, wrought iron
C. wrought iron,low carbon steel, grey cast iron
D. wrought iron, grey cast iron, low carbon steel
E. grey cast iron, wrought iron, low carbon steel
