______________ cannot control the noise pollution ?

Related Mcqs:

1. 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

2. 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.

3. 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

4. Noise pollution level in a chemical plant is expressed in __________________?

   A. Roentgen
   B. Decibel
   C. Hertz
   D. None of these

5. Noise level inside a jet airliner in normal flight is about ______________ decibels?

   A. 80
   B. 100
   C. 125
   D. 150

6. Noise level during normal conversation among men is about ______________ decibels?

   A. 10
   B. 45
   C. 90
   D. 115

7. 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

8. 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

9. 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.

10. Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?

    A. 85
    B. 105
    C. 125
    D. 145