Question 2

• AIM: To test the student in different stages in superheterodyne radio receiver.

  1. You are provided with superheterodyne radio receiver set.
  2.   Let the Supervisor open the back cover of the radio receiver.
  3.   List two tools used by the Supervisor in opening the back cover of the radio receiver.
  4. Copy Table 2 into your answer booklet.

  Table 2

  Stage	Component	Function of the component	Fault associated with the stage
  Radio Frequency Power Amplifier
  Local Oscillator
  Audio Frequency Output

  5. Identify the radio frequency amplifier stage in the radio receiver.
  6.   In the radio receiver frequency amplifier stage, identify three components and record them accordingly in Table 2.
  7. State the function of each component listed in (f) as specified in Table 2.
  8. Repeat steps (e) to (g) for other two stages listed in Table 2.
  9. List two faults associated with each stage listed in Table 2.
  10. Locate the audio I.C., count and record the number of pins on it.
  11. State on safety precaution to be taken in replacing a faulty audio I.C.

  The candidates were expected to let the supervisor open the back cover of the radio receiver while taking note of steps taken.