Pick out the wrong statement?

Which furnace employs an I.D. fan for the removal of flue gases from the furnace?

Leakage in a cooking gas cylinder is detected by________?

Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be________?

With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________?