1899. Vessels made of __________ can be used to store dry chlorine.
Thermoplastic materials
Nickel
Steel or iron
None of these
✅ The correct answer is option C.
1901. Tin coating is not done by
Vaporising
Hot dipping
Electro deposition
Spraying
✅ The correct answer is option A.
1903. Wrought iron is having very high
Hardness
Strength
Corrosion resistance
Susceptibility to changes in its properties by heat treatment
✅ The correct answer is option C.
1905. Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?
Armature of small motors/generators
Generators and small motors
Induction motors
High frequency transformers
✅ The correct answer is option D.
1908. Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)
Do not require heat treatment for any of its applications
Are used for leaf and coiled springs
Do not have good resilience properties
Is tempered at 850°C
✅ The correct answer is option B.
1911. Which of the following is a non-magnetic material?
Cobalt
Zinc
Nickel
None of these
✅ The correct answer is option B.
1875. Bush bearings are made of
Mild steel
Phosphorous bronze
White metal alloys
None of these
✅ The correct answer is option B.
1878. Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.
High silicon iron, Kel-F and teflon
Tin and wood
Silicone rubber
Stainless steel
✅ The correct answer is option A.
1881. Fatigue failure of a material may occur, when it is subjected to __________ stress.
Fluctuating
Tensile
Compressive
Torsion
✅ The correct answer is option A.
1884. Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
✅ The correct answer is option C.