ABSTRACT
Plot a graph showing the variation of capacitance with voltage for the varactor. Label your axes clearly and use your graph to determine (a) the capacitance when the reverse voltage is −17.5V, (b) the reverse voltage for a capacitance of 35 pF, and (c) the change in capacitance when the voltage changes from −2.5V to −22.5V. (8)
12. Briefly describe, with diagrams, the action of an n-p-n transistor. (7)
13. The output characteristics of a common-emitter transistor amplifier are given below. Assume that the characteristics are linear between the values of collector voltage stated.
