(Le/D) for fully open gate valves would be ________?

Pressure differential maintained across a continuous rotary vacuum filter is in the range of ________ mm Hg column?

The 92U238 emits an a-particle. The product is________?

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is ________ percent?

Efficient burning of anthracite coal requires________?

Carbon/hydrogen ratio (by weight) is maximum (out of following) for________?