1770. Spark plugs are made of
High alumina ceramic
Metallic carbides
Corundum
Carborundum
✅ The correct answer is option A.
1773. Mild steel storage vessels are suitable for the storage of
Anhydrous ammonia
Fatty acids
Hydrochloric acid (95%)
Sulphuric acid (25%)
✅ The correct answer is option A.
1776. ‘Semi steel’ is
Produced by adding 10-20% steel to the cupola charge
Stronger than cast iron
Both A & B
Neither A nor B
✅ The correct answer is option C.
1779. Brass is an alloy of
Nickel and tin
Copper and zinc
Tin and lead
Copper, nickel and zinc
✅ The correct answer is option B.
1782. 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.
1785. 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.
1788. Copper has very low
Malleability
Ductility
Tensile strength
Thermal & electrical conductivity
✅ The correct answer is option C.
1791. Nitriding of steel is a process for
Case hardening
Spheroidising
Normalising
Annealing
✅ The correct answer is option A.
1794. Age hardening is concerned with
Copper
Brass
Duralumin
Silver
✅ The correct answer is option C.
1718. In order to be called steel, an alloy should have iron percentage greater than
80
70
90
50
✅ The correct answer is option A.