18.
19,
20.

21.

23.

24.

25.

List the different types of errors in measurements.

Write the steps for testing a transistor,

Determine the phase shift between two sine waves, which is
indicated by the pattern as in fig 3,

Fig3
PART 8

Answer any 4 complete questions each having 10 marks

Explain the structure of any three types of fixed resistors. Mention its advantages and
disadvantages,
A)Draw the V-I characteristics of a p-n junction diode, If the reverse saturation current of a
Germanium pn junction diode at room temperature is 6pA.Determine the current flowing
through the diode when 0.2 V forward bias is applied. Given thermal voltage ടിന്റു = 26
MV.
B) A doorbell requires 0.4۸ at 6 ۷۰ It is connected to a transformer whose primary contains 2000
turns and is connected to a 110 V household outlet.

1. How many turns should be there in the secondary?

2. Find the current in the primary?

3. How many watts does the bell require from the transformer?
Sketch and explain the typical input- output characteristics of a BJT when connected in
(1) Common Emitter configuration and
(ii) Common Base configuration
a) Find out the Q point for the transistor circuit shown
in fig 4. (5 marks)
b) With the help of schematic block diagram, explain the
principle operation of a photo transistor. (5 marks) B=100, ۷۰-۷
a) Draw and explain the working of enhancement mode
MOSFET, (5 marks) 6100 7 26೧
b) With a neat diagram explain the principle of operation
of SCR. (5 marks)

۷۶۷

80 ۲٢ ന Re 4 kQ

Fig 4
Answer any 2 complete questions each having 10 marks
a) Discuss a full wave voltage doubler with circuit diagram. (4 marks)