High noise levels produced during operation of fans and compressors ca – McqOptions

MCQOPTIONS

1.	High noise levels produced during operation of fans and compressors can be reduced by using
A.	mufflers (silencers).
B.	accoustical absorbent.
C.	lagging of noisy duct.
D.	none of these.
Answer» B. accoustical absorbent.

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