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Q1. A small silicon transistor with the characteristics given in Worksheet Q3 has a maximum safe power dissipation of 18 mW and it is to be operated on a 12 volt d.c. supply.

(a) Plot the maximum power dissipation curve on the characteristics.

(b) Determine the minimum value of collector load resistance for the transistor if this dissipation is not to be exceeded.

(c) If the transistor is used in a common emitter configuration and is biased at a base current of 60 mA and an alternating signal of  40 mA is applied to the base,

determine EACH of the following:

(i) The r.m.s. voltage variation between collector and emitter;

(ii) The r.m.s. value of the variation in collector current.