7197Chemical EngineeringMedium
Which of the following polymers belong to the class of formaldehyde resin?
ANone of these
BTeflon
CDacron
DMelamine resins
Correct answer
D. Melamine resins
Explanation
The correct answer is Melamine resins.
Correct answer
D. Melamine resins
Explanation
The correct answer is Melamine resins.
Earing is a defect found in steels after the following metal working operation?
As the product becomes finer, the energy required for grinding________?
Carborundum used for making crucibles for melting non-ferrous metals is chemically________?
Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of ________ pressure?
________ of rubber decreases after its vulcanisation?
Thermal efficiency of an internal combustion engine is around ________ percent?