RGPV BE Question Paper of BE-104 Basic Electrical & Electronics Engineering December 2014 - Free Download
University / Exam Boad : Rajiv Gandhi Technical University, RGPV Bhopal
Subject Code of Question Paper : BE 104
Semester : I and II Semester Exams Paper
Question Paper Year : December 2014
Subject of Question Paper : Basic Electrical & Electronics Engineering
Time : Three Hours
Maximum Marks : 70
BE - 104
B.E. I & II Semester Examination, December 2014
Basic Electrical & Electronics Engineering
Time : Three Hours
Maximum Marks : 70
Note:i) Answer five questions. In each question part A, B, C is compulsory and D part has internal
choice.
ii) All parts of each questions are to be attempted at one place.
iii)All questions carry equal marks, out of which partA and B (Max.50 words) carry 2 marks, part
C (Max.100 words) carry 3 marks, part D (Max.400 words) carry 7 marks.
iv) Except numericals, Derivation, Design and Drawing etc.
Unit - I
1. a) Write the major difference between:
i) Ideal voltage source and practical voltage source
ii) Dependent and independent sources.
b) Define :
i) Impedance and
ii) Phase sequence in a.c. circuit.
c) Explain with units and
i) Real power
ii) Reactive power
iii) Apparent power in a.c. circuit.
d) Derive the relation for conversion for star and delta connection.
Or
State Thevenin’s theorem. Determine the current through a 3Ω resistor branch in the circuit
using Thevenin’stheorem.
Unit - II
2. a) Define magnetic leakage and fringing.
b) Give the reason of eddy current loss in transformer core.
c) Define voltage regulation and efficiency of a transformer. Give the formula also.
d) Draw the complete phasor diagram of a single phase transformer for an inductive load. Also
write the notations used for all voltages and currents used in the phasor diagram.
10V +–
I
↑
↑
1Ω
2Ω
2Ω
10A 3Ω
http://www.rgpvonline.com
[2]
BE-104 PTO
Or
The results of tests performed on 1φ, 20 KVA, 2200/220 volt, 50 Hz. Transformer are as
followsO.C.
test : 220 V, 4.2 A, 148 W
S.C. test : 86 V, 10.5 A, 360 W.
Determine:
The regulation and efficiency at 0.8 p.f. lagging at full load.
Unit - III
3. a) Write the necessity and material used for the following in a d.c. machine
i) Commutator
ii) Brush
b) Why synchronous machine is called as synchronous. Define synchronous speed.
c) Classify self excited D.C. motor.
d) Derive the e.m.f. equation of a 3 phase Induction Motor.
Or
Draw and explain the complete Torque-slip characteristics of 3 phase induction motor.
Unit - IV
4. a) State and explain De Morgan’s theorem.
b) Simplify the Boolean function Z = AB + AC + BC and therefore design the logic circuit using
AND or OR logic gates.
c) Explain half adder and full adder with truth table.
d) Explain number systems used in digital electronics.
Or
Explain in detail J-K flip flop.
Unit - V
5. a) Define ideal diode and practical diode.
b) Differentiate between conductor, semiconductor and insulator with example.
c) Draw and explain the V-I, characteristic of diode.
d) Draw the connection diagram and explain the use and working of CE transistor configuration.
Or
Explain the working of BJT. Discuss DC biasing of BJT.
University / Exam Boad : Rajiv Gandhi Technical University, RGPV Bhopal
Subject Code of Question Paper : BE 104
Semester : I and II Semester Exams Paper
Question Paper Year : December 2014
Subject of Question Paper : Basic Electrical & Electronics Engineering
Time : Three Hours
Maximum Marks : 70
BE - 104
B.E. I & II Semester Examination, December 2014
Basic Electrical & Electronics Engineering
Time : Three Hours
Maximum Marks : 70
Note:i) Answer five questions. In each question part A, B, C is compulsory and D part has internal
choice.
ii) All parts of each questions are to be attempted at one place.
iii)All questions carry equal marks, out of which partA and B (Max.50 words) carry 2 marks, part
C (Max.100 words) carry 3 marks, part D (Max.400 words) carry 7 marks.
iv) Except numericals, Derivation, Design and Drawing etc.
Unit - I
1. a) Write the major difference between:
i) Ideal voltage source and practical voltage source
ii) Dependent and independent sources.
b) Define :
i) Impedance and
ii) Phase sequence in a.c. circuit.
c) Explain with units and
i) Real power
ii) Reactive power
iii) Apparent power in a.c. circuit.
d) Derive the relation for conversion for star and delta connection.
Or
State Thevenin’s theorem. Determine the current through a 3Ω resistor branch in the circuit
using Thevenin’stheorem.
Unit - II
2. a) Define magnetic leakage and fringing.
b) Give the reason of eddy current loss in transformer core.
c) Define voltage regulation and efficiency of a transformer. Give the formula also.
d) Draw the complete phasor diagram of a single phase transformer for an inductive load. Also
write the notations used for all voltages and currents used in the phasor diagram.
10V +–
I
↑
↑
1Ω
2Ω
2Ω
10A 3Ω
http://www.rgpvonline.com
[2]
BE-104 PTO
Or
The results of tests performed on 1φ, 20 KVA, 2200/220 volt, 50 Hz. Transformer are as
followsO.C.
test : 220 V, 4.2 A, 148 W
S.C. test : 86 V, 10.5 A, 360 W.
Determine:
The regulation and efficiency at 0.8 p.f. lagging at full load.
Unit - III
3. a) Write the necessity and material used for the following in a d.c. machine
i) Commutator
ii) Brush
b) Why synchronous machine is called as synchronous. Define synchronous speed.
c) Classify self excited D.C. motor.
d) Derive the e.m.f. equation of a 3 phase Induction Motor.
Or
Draw and explain the complete Torque-slip characteristics of 3 phase induction motor.
Unit - IV
4. a) State and explain De Morgan’s theorem.
b) Simplify the Boolean function Z = AB + AC + BC and therefore design the logic circuit using
AND or OR logic gates.
c) Explain half adder and full adder with truth table.
d) Explain number systems used in digital electronics.
Or
Explain in detail J-K flip flop.
Unit - V
5. a) Define ideal diode and practical diode.
b) Differentiate between conductor, semiconductor and insulator with example.
c) Draw and explain the V-I, characteristic of diode.
d) Draw the connection diagram and explain the use and working of CE transistor configuration.
Or
Explain the working of BJT. Discuss DC biasing of BJT.
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