Consumer Electronics

Multiple Choice Questions

1. A loudspeaker converts
   1. electrical energy to mechanical energy
   2. acoustic energy to electrical energy
   3. mechanical energy to electrical energy
   4. electrical energy to acoustic energy
2. The input impedance of a crystal loudspeaker is
   1. resistive
   2. inductive
   3. capacitive
   4. a combination of (a) and (b)
3. Crystal speakers are used in
   1. low frequencies
   2. high frequencies
   3. mid frequencies
   4. both (c) and (d)
4. Electrostatic speakers need a
   1. dc polarising voltage
   2. ac polarising voltage
   3. either (a) or (b)
   4. neither (a) nor (b)
5. The dc bias (polarising voltage) in electrostatic speakers is of the order of
   1. 500 to 1000 V
   2. 1100 to 1500 V
   3. 1000 to 1200 V
   4. 500 to 1200 V
6. High class sound systems use electrostatics to reproduce
   1. low frequencies
   2. mid frequencies ...