A. silicon and sulphur
B. phosphorous, lead and sulphur
C. sulphur, graphite and aluminium
D. phosphorous and aluminium
E. none of the above
Related Mcqs:
- 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 - Depth of hardness of steel is increased by addition of_________________?
A. nickel
B. chromium
C. tungsten
D. vanadium
E. ell of the above - Corrosion resistance of steel is increased by addition of________________?
A. chromium and nickel
B. sulphur, phosphorus, lead
C. vanadium, aluminium
D. tungsten, molybdenum, vanadium, chromium
E. zinc - Corrosion resistance of steel is increased by adding__________________?
A. chromium and nickel
B. nickel and molybdenum
C. aluminium and zinc
D. tungsten and sulfur
E. none of the above - Ignition quailty of petrol is expressed by___________________?
A. octane number
B. cetane number
C. calorific value
D. self ignition temperature
E. distillation temperature - If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?
A. throttling calorimeter
B. separating calorimeter
C. combined separating and throttling calorimeter
D. bucket calorimeter
E. none of the above - Size of boiler tubes is specified by___________________?
A. mean diameter and thickness
B. inside diameter and thickness
C. outside diameter and thickness
D. outside diameter and inside diameter
E. outside diameter alone - Hardness of steel depends on_________________?
A. amount of carbon it contains
B. the shape and distribution of the car-bides in iron
C. method of fabrication
D. contents of alloying elements
E. the quality of ore from which it is made - A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
A. allotropic change
B. recrystallisation
C. heat treatment
D. precipitation
E. austempering - Tungsten in high speed steel provides________________?
A. hot hardness
B. toughness
C. wear resistance
D. sharp cutting edge
E. cold hardness
