A. Roentgen
B. Decibel
C. Hertz
D. None of these
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Related Mcqs:
- High noise level in a chemical plant can be controlled by the_________________?
- A. Suppression of noise at the source itself B. Path control of noise C. Protection of operating personnel D. All A., B. & C....
- 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....
- ______________ cannot control the noise pollution ?
- A. Use of silencers B. Green house gases C. Vibration damping D. Tree plantation...
- 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...
- 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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