Rajiv Gandhi Proudyogiki Vishwavidyalaya 2011-2nd Year B.E Electrical and Electronics Engineering Basic Electricals and Electronics Engineering of Year (First semester ) - Question Paper

BASIC ELECTRICAL & ELECTRONIC ENGINEERING
Time three hours
maximum marks 70
passing marks 22
UNIT 1

1 (a) discuss ideal voltage source ideal current source with neat diagram how ideal voltage source can be converted into ideal current source ?

(b) State nodal analysis,with example .
or
2 (a)State and discuss superposition theorem with the help of example.

(b) Establish the relationship ranging from phase and line voltages in 3-phase star connected circuit .

UNIT two

3 (a) explain in brief about the construction and principle of transformer.

(b) Draw and discuss the phasor diagram of single phase transformer under lagging load .

or
4 (a) These are the studying for open O.C. and S.C. test on eight KVA , 400/120 V , 50 HZ transformer ;
O.C. ;120V , 4A ,75 W
S.C. ;9.5 V . 20 A 110 W
obtain ;
(1) the equivalent circuit parameters .
(2) efficiency at half load and 0.8 P.F. lagging

(b) discuss open circuit test and short circuit test of single phase transformer .

UNIT 3

5 (a) Classify the rotating electric machine with their application .

(b) discuss the concept of rotating machines in a three phase induction motor.

or

6 (a) An eight pole wave wound D.c. generator has 900 armature wires and flux per pole of 0.04 Wb . At what speed it must drive to generate 500 v?

(b) discuss the working principle and construction of D.C. motor.

UNIT 5

7 (a) what is octal number system ? how will you convert an octal in to decimal number ?explain with example.

(b) using 2`s complement subtract (100111) from (1100110.

or

8 (a) describe NAND and NOR gate and provide their truth table .

(b) What is half adder ? How is it realised using logic gates ?

UNIT five

9 (A) What do you understand by intrinsic and extrinsic semi conductors ?

(b) explain the behaviour of P N junction diode under forward biasing .

or

10 (a) Draw the circuits of different transistors configuration list their important features .

(b) What do you understands by transistor biasing ? provide its importance.

Earning:   Approval pending.