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

Related Mcqs:

1. 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

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. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?

   A. 90
   B. 120
   C. 150
   D. 180

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

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

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

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

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

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

7. 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

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

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

9. 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

10. 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