R.G.P.V. Bhopal (MP)
B.E. (1st/ 2nd Semester) EXAM JAN-2011
BASIC ELECTRICAL & ELECTRONICS [ BE-104 ]
Time:3 Hrs Max Marks:100 Min Marks: 35
Note:Attempt any five questions taking one question from each unit.All question Carry equal marks.
Note:Attempt any five questions taking one question from each unit.All question Carry equal marks.
UNIT-I
Q.1 (a) Explain ideal voltage source ideal current source with neat diagram how ideal voltage source can be converted into ideal current source ? 10
(b) State nodal analysis,with example . ? 10
OR
Q.2 (a)State and explain superposition theorem with the help of example.? 10
(b) Establish the relationship between phase and line voltages in 3-phase star connected circuit .? 10
(b) Establish the relationship between phase and line voltages in 3-phase star connected circuit .? 10
UNIT-II
Q.3 (a) Discuss in brief about the construction and principle of transformer. ? 10
(b) Draw & explain the phasor diagram of single phase transformer under lagging load ? 10
(b) Draw & explain the phasor diagram of single phase transformer under lagging load ? 10
OR
Q.4 (a) These are the reading for open O.C. and S.C. test on 8 KVA , 400/120 V , 50 HZ transformer ; ?10
O.C. : 120V , 4A , 75 W
S.C. : 9.5 V . 20 A 110 W
Find ;
(1) the equivalent circuit parameters .
(2) efficiency at half load and 0.8 P.F. lagging
O.C. : 120V , 4A , 75 W
S.C. : 9.5 V . 20 A 110 W
Find ;
(1) the equivalent circuit parameters .
(2) efficiency at half load and 0.8 P.F. lagging
(b) Explain open circuit test and short circuit test of single phase transformer .?10
UNIT-III
Q.5 (a) Classify the rotating electric machine with their application .?10
(b) Explain the concept of rotating machines in a 3 phase induction motor.? 10
(b) Explain the concept of rotating machines in a 3 phase induction motor.? 10
OR
Q.6 (a) An 8 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? 10
(b) explain the working principle and construction of D.C. motor.? 10
(b) explain the working principle and construction of D.C. motor.? 10
UNIT -V
Q.7(a) what is octal number system ? how will you convert an octal in to decimal number ? explain with example. / 10
(b) using 2`s complement subtract (100111) from (1100110. ? 10
(b) using 2`s complement subtract (100111) from (1100110. ? 10
OR
Q.8 (a) Define NAND and NOR gate and give their truth table ? 10
(b) What is half adder ? How is it realized using logic gates ? 10
(b) What is half adder ? How is it realized using logic gates ? 10
UNIT-V
Q.9 (a) What do you understand by intrinsic and extrinsic semi conductors ? 10
(b) discuss the behaviour of P N junction diode under forward biasing ? 10
(b) discuss the behaviour of P N junction diode under forward biasing ? 10
OR
Q.10 (a) Draw the circuits of various transistors configuration list their important features ? 10
(b) What do you understands by transistor biasing ? give its importance ? 10
(b) What do you understands by transistor biasing ? give its importance ? 10
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