26.

27.

28.

Answer any 2 complete questions each having 10 marks
a) Calculate ag. and 96: for a transistor if IC is measured as ImA, and IB is 25114. Also

determine the new base current to give IC = 5mA. (4)
b) Explain the working of the given circuit and Sketch Vo and transfer characteristics for the
input shown. (6)

a) Draw the block diagram of a function generator. (4)

b) A 5 kQ load is fed from a bridge rectifier connected across a transformer secondary whose

primary is connected to 460V, 50 Hz supply. The ratio of number of primary turns to secondary

turns is 2:1. Calculate d.c load current, d.c load voltage, ripple voltage and PIV rating of diode.
(6)

Mention the procedure for checking the following devices:

a) UJT ४) SCR 0) JFET 6) BIT 6) capacitor (10)