Blowdown is necessary on boilers, because |
1. The boiler water level is lowered rapidly in case it accidentally rises too high. |
2. The precipitated sediment or sludge is removed while the boiler is in service. |
3. The concentration of suspended solids in the boiler is controlled. |
A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 3 alone is correct
D) 1 and 3 are correct
Correct Answer: C
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