Correct answer
B. 20 to 40
Explanation
The correct answer is 20 to 40.
Iron alloyed with carbon upto 2% is called________?
In large thermal power stations very fine particulates present in flue gas are removed by________?
Varnish does not contain________?
A chemical process is said to occur under unsteady state, if the________?
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ________ percent as compared to the use of atmospheric combustion air?
Stack (chimney) height in a big thermal power plant is dictated by the________?