81. Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
Cast iron
Stainless steel or glass lined vessel
Karbate
Wrought iron
✅ The correct answer is option B.
Materials and Construction MCQs
82. Glass is corroded by
Fluorine (dry or wet)
Sulphuric acid
Phosphoric acid
None of these
✅ The correct answer is option A.
83. Cast iron compared to steel is better in
Ductility
Fluidity & castability
Strength
Malleability
✅ The correct answer is option B.
84. Centrifugal pump made of pyrex or glass can’t be used to pump
Milk and fruit juices
Alkaline solutions
Dilute H₂SO₄ at room temperature
Brine
✅ The correct answer is option B.
85. Evaporator used for concentrating tomato juice is made of
Nickel
Brass
Stainless steel-glass lined
Cast iron-rubber lined
✅ The correct answer is option C.
86. Presence of nitrogen in steel
Makes it brittle
Increases its strength
Increases its hardness
Is desirable
✅ The correct answer is option A.
87. Copper has very low
Malleability
Ductility
Tensile strength
Thermal & electrical conductivity
✅ The correct answer is option C.
88. A material no longer behaves elastically beyond
Plastic limit
Limiting load
Elastic limit
Breaking load
✅ The correct answer is option C.
89. Cast iron has very high
Compressive strength
Ductility
Shock resistance
Resistance to brittleness
✅ The correct answer is option A.
90. Nitriding of steel is a process for
Case hardening
Spheroidising
Normalising
Annealing
✅ The correct answer is option A.