AERO - ACOUSTICS

A cinema hall has a volume of 700 m3 and the total absorption in the hall is 700 O.W.U. The time of

reverberation should be ____________.

• 0.165 s

• 1.65 s

• 0.49 s

• 4.9 s

To get good sound effect inside a hall ____________.

• the reverberation time has to be as large as possible

• the reverberation time has to be zero.

• the hall should not have any absorbing material.

• the reverberation time has to be optimum.

The absorption coefficient is measured in ____________.

• CLOSED WINDOW UNIT

• OPEN WINDOW UNIT

• OPEN DOOR UNIT

• none of these

Reverberation time is: ____________.

• directly proportional to volume

• inversely proportional to volume

• equal to volume

• none of the above

Echelon effect is produced by ____________.

• floors

• ceiling

• curved surfaces

• staircase

Use of absorbents ____________ the reverberation time.

• increases

• decreases

• have no effect on

• can increase or decrease

Optimum reverberation time for music is ____________.

• 0.5 to 1 seconds

• 0 to 1 seconds

• 1 to 2 seconds

• abo ve 5 seconds

The Sabine is the unit of ____________.

• energy

• reverberation time

• absorption of a hall

• reflection by a wall

For a uniform distribution of sound intensity is it better to have ____________.

(c) r (d)

• parabolic reflector

• concave reflector

• spherical reflecto

• cylindrical reflector

The persistence of sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called as what?

• reflection

• echo

• reverberation

• compression