A. Suppression of noise at the source itself
B. Path control of noise
C. Protection of operating personnel
D. All A., B. & C.
Related Mcqs:
- Noise pollution level in a chemical plant is expressed in __________________?
A. Roentgen
B. Decibel
C. Hertz
D. None of these - The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
A. 60
B. 90
C. 105
D. 120 - Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
A. 3
B. 30
C. 7
D. 70 - Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
A. 20
B. 60
C. 90
D. 120 - The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
A. Pipe vibrations
B. Cavitation
C. Boundary layer separation
D. Fluctuation in liquid flow - Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to_________________?
A. Reynold stresses
B. Shear forces
C. Both A. & B.
D. Neither A. nor B. - Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
A. 105
B. 135
C. 160
D. 185 - Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
A. 75
B. 95
C. 120
D. 140 - A man exposed to excessive noise level in the working environment may suffer from____________________?
A. Hearing loss
B. Rupture of ear drum
C. Nervousness & fatigue
D. All A., B. & C. - Noise level during normal conversation among men is about ______________ decibels?
A. 10
B. 45
C. 90
D. 115
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