1874. Which of the following is not used as the ceramic material in ‘cermets’?
Silicides
Oxides
Carbides
Nitrides
✅ The correct answer is option D.
1877. Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
High strength to weight ratio
Low temperature strength properties
Its ability to be cast, rolled, forged & stamped
High strength and corrosion & oxidation-resistance at elevated temperature
✅ The correct answer is option A.
1880. Presence of cobalt in steel improves its
Cutting ability
Corrosion resistance
Tensile strength
None of these
✅ The correct answer is option A.
1883. Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?
Cast iron
Steel
Nickel
Karbate
✅ The correct answer is option C.
1886. Which is the purest form of iron?
Wrought iron
Pig iron
Bessemer iron
Grey iron
✅ The correct answer is option A.
1889. The phenomenon in which slow extension of material takes place with the time at constant load is called
Plasticity
Creep
Elasticity
Ductility
✅ The correct answer is option B.
1891. Stainless steel is not corroded by
Hydrochloric acid (10%)
Nitric acid (10%)
Sulphuric acid (10%)
Saturated brine
✅ The correct answer is option B.
1893. Which of the following commercial metals is most abundantly found in India?
Copper
Aluminium
Nickel
Zinc
✅ The correct answer is option B.
1895. Rotary kilns in cement industry are lined with____bricks.
Fireclay
Silica
Lead
High alumina & high magnesia
✅ The correct answer is option D.
1897. Which of the following has the highest density and the lowest melting point?
Stainless steel
Titanium
Lead
Aluminium
✅ The correct answer is option C.