Rajasthan Technical University 2009-1st Year B.C.A Computer Application University of rajasthan .- - - Question Paper

SEMICONDUCTOR PHYSICS, ELECTRONIC DEVICES AND CIRCUITS

1. (a) What is Bohr's quantum condition for angular momentum of electron in a atom ? Write the name of symbols used in the condition. 5

(b) provide 5 examples of covalent bonding. 2.5

2. (a) elaborate the characteristics of a semiconductor ? What do you mean by deplation layer in a p-n junction ? 5

(b) Classify every of the subsequent as n-type or p-type semiconductors :
(i) Doped by acceptor atoms
(ii) Crystal with pentavelent impurities
(iii) Majority carriers are holes
(iv) Minority carriers are free electron
(v) Donor atoms were added to crystal. 2.5

3. (a) describe mobility and electrical conductors and provide SI units. 5

(b) Draw an energy level diagram showing tje donor and acceptor energy levels with respect to valence and conduction band. 2.5

4. explain the V-I characteristica of a tunnel diode and write its applications. 5+2.5

5. (a) Derive an expression for ripple factor for a full-wave rectifier. 5

(b) explain the role of L part filter. 2.5

6. (a) Write elementary info about Thyristors and display devices. 5

(b) discuss bipolar transistor action. 2.5

Earning:   Approval pending.