Are prone to temper brittleness
Are used for automobile parts like gears, axle, shaft, bearings etc
Have very poor fatigue resistance
Do not contain nickel or chromium or both
✅ The correct answer is option B.
Engineering MCQs
Most suitable material for high pressure vessel operating at 500 atm. and 500° C is
Molybdenum stainless steel
18/8 stainless steel
Mild steel
High silicon iron (14% Si)
✅ The correct answer is option A.
Addition of __________ in steel can help in increasing the depth of hardness.
Nickel
Chromium
Vanadium
Tungsten
✅ The correct answer is option D.
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
Corrosion resistance
Tensile strength
Machinability
Compressive strength
✅ The correct answer is option C.
Hastelloy comprises of
Copper and tin
Copper and nickel
Molybdenum and nickel
Lead and tin
✅ The correct answer is option C.
Manganese in steel affects its
Ductility
Tensile strength
Hardness
None of these
✅ The correct answer is option B.
Polymorphism is not exhibited by
Carbon
Iron
Phosphorous
None of these
✅ The correct answer is option D.
Zinc is highly __________ at room temperature.
Ductile
Resistant to atmospheric corrosion
Malleable
Brittle
✅ The correct answer is option B.
Glass lined vessels are not used for handling
Dilute HNO₃
Dilute HNO₃
Dilute HCI
Hydroflouric acid
✅ The correct answer is option D.
Pure nickel is
Ferromagnetic above its curie point (i.e., 415°C)
Having h.c.p. crystal lattice
Ferromagnetic at room temperature
Not resistant to oxidation at high temperature
✅ The correct answer is option C.