Consumer Electronics

Multiple Choice Questions

1. Microphones are electroacoustic transducers which convert
   1. acoustic energy to electrical energy
   2. electrical energy to acoustic energy
   3. acoustic energy to mechanical energy
   4. mechanical energy to acoustic energy
2. The unit of sound pressure used for rating microphones is
   1. pascal
   2. bar
   3. watt
   4. decibel
3. The polar diagram of a true omnidirectional microphone is
   1. perfect circle
   2. figure-of-eight
   3. cardioid
   4. none of the above
4. Moving coil microphones are
   1. active transducers
   2. unidirectional
   3. both (a) and (b)
   4. neither (a) nor (b)
5. Moving coil microphones are
   1. omnidirectional
   2. unidirectional
   3. (c) neither (a) nor (b)
6. Carbon microphones
   1. produce an emf
   2. modulate the current from an external battery
   3. both (a) and (b)
   4. neither (a) nor (b)
7. The ...