The emission of an ?-particle causes the resultant nucleus to have
A.less atomic weight and less atomic number
B.less atomic weight and more atomic number
C.more atomic weight and more atomic number
D.more atomic weight and less atomic number
Category: Chemical Engineering Mcqs
Which reaction takes place in CO boiler of fluid catalytic cracking units?
A.2CO2 ? 2CO + O2
B.2CO + O2 ? 2CO2 + energy
C.CH4 + 2O2 ? CO2 + 2H2O
D.C2H4 + 3O2 ? 2CO2 + 2H2O
How many cubic foot of air is required for the complete and perfect combustion of one cubic foot of methane
A.2.0 cu. Ft.
B.3.0 cu. Ft.
C.7.5 cu. Ft.
D.9.52 cu. Ft.
Raw materials for the manufacture of ammonium nitrate are
A.liquid ammonia and air
B.liquid ammonia 60% nitric acid and clay (diatomaceous earth kieselgur)
C.anhydrous ammonia and nitrous acid
D.liquid ammonia and 98% sulphuric acid
The correct amount of excess air is the amount that gives
A.the maximum fuel consumption for the given requirement
B.the high percentages of O2 in the flue gas
C.the high stack temperature
D.the most efficient furnance operation and the minimum fuel consumption for the given heating requirement
The bright glow of a combustion process is the characteristic of
A.fast and high temperature oxidation
B.slow and low temperature oxidation
C.slow and high temperature oxidation
D.fast and low temperature oxidation
The material preferred for the fabrication of fruit juice concentrator is
A.Cast iron
B.Mild steel sheet
C.Stainless steel sheet
D.Copper
E.Brass
A radioactive substance gives off Y-rays when
A.its nucleus goes from a higher energy state to a lower one
B.one of the orbital electrons jumps from a higher orbit to one of a lower energy
C.an orbital electron jumps from a lower orbit to a higher one
D.its nucleus goes from a lower energy state to a higher one
In an atom the electrons
A.move round the nucleus at random
B.are embedded in space around the nucleus
C.are distributed as three dimensional charge clouds around the nucleus
D.are stationary in various energy levels
