The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?

Related Mcqs:

1. 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....

2. 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...

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

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

4. Noise level in a quiet private business office is about _____________ decibels?

   A. 25 B. 50 C. 70 D. 85...

5. 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...

6. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?

   A. 35 B. 75 C. 95 D. 105...

7. 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....

8. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?

   A. 120 B. 140 C. 170 D. 200...

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

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

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

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