2181. A suitable material of construction to use with fuming sulphuric acid is
Carbon steel
Stainless steel type 304
Nickel
Monel
✅ The correct answer is option D.
2184. Nickel and copper are the basic constituents of
Hastelloy
Monel metal
German silver
Inconel
✅ The correct answer is option B.
2147. Which of the following is the most widely used insulating material for steam carray-ing pipelines?
Ceramic fibre blanket
Glass wool and 85% magnesia
Vermiculite
Slag wool
✅ The correct answer is option B.
2150. The main purpose of galvanising iron sheets is to
Harden the surface
Increase its glossiness and lustre
Prevent the action of water
Prevent the action of oxygen
✅ The correct answer is option C.
2153. A bearing metal should not have
Enough plasticity
Low thermal conductivity
Low co-efficient of friction
High toughness
✅ The correct answer is option B.
2156. Which of the following has the least carbon percentage?
Low carbon steel
Mild steel
Wrought iron
White cast iron
✅ The correct answer is option C.
2159. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Increase in calorific value of the fuel
Increase in flame temperature
Reduction in scale losses
Saving in fuel consumption
✅ The correct answer is option A.
2162. Shaft furnaces are used for
Smelting
Calcining
Roasting
All of the above
✅ The correct answer is option D.
2165. Regenerators are normally provided in the
Glass melting furnace
Open hearth furnace
By product coke ovens
All of the above
✅ The correct answer is option D.
2119. Cermets are used for making
Cutting tools
Abrasives
Both A & B
Neither A nor B
✅ The correct answer is option C.