Topic 8 - Principle of Audio Signals

What is the medium for sound waves existence?

• Pressure

• Air

• Water

• Gas

Which statement is best described about wavelength?

• Wavelength is the distance between 2 points occur at same place in a cycle

• Wavelength is the distance occur at the same place

• Wavelength is movements in the medium itself

• Wavelength is movement of air molecules.

Name the type of sound as shown.

• Reverberant sound

• Related sound

• Direct sound

• Reflected sound

Microphone converts ______ energy into ______ energy

• Electrical energy into transducer energy

• Electrical energy into acoustical energy

• Acoustical energy into electrical energy

• Acoustical energy into transducer energy

Which of the statement is False for Dynamic microphone?

• Dynamic microphone needs external power.

• Dynamic microphone is heavy and less sensitive.

• Dynamic microphone is can handle loud vocal.

• Dynamic microphone is extremely durable.

This class of amplifier has lowest efficiency but has the best sound quality.

• Class A

• Class B

• Class AB

• Class D

What is the difference between a balanced and unbalanced circuit?

• Unbalance audio circuit works longer distance

• Unbalance audio circuit works better than balanced

• Balanced audio circuit reject unwanted noise better than unbalanced

• Balanced audio circuit does not have same impedance

Assuming a 2 kHz sound wave moves with a velocity of 350 m/s, what is the wavelength of the wave?

• 1.750 m

• 0.175 m

• 5.714 m

• 50.71 m

Which of the statement is not true about equalizers?

• It helps to boost or reduce levels of different frequencies.

• It helps to reduce feedback.

• It helps to correct signals and make sound more intelligible.

• It helps to draws out only low frequencies. 

Picture shows the parts of a dynamic microphone. Select the correct order.

• A - Coil

  B - Magnet

  C - Diaphragm

  D - Wires carry audio signal

• A - Coil

  B - Wires carry audio signal

  C - Diaphragm

  D - Magnet

• A - Wires carry audio signal

  B - Magnet

  C - Coil

  D - Diaphragm

• A - Wires carry audio signal

  B - Magnet

  C - Diaphragm

  D - Coil