STUPIDSID
RGPV First Year Engineering (Set A) (Semester 1)
Basic Electricals & Electronics Engg.
December 2014
Basic Electricals & Electronics Engg.
December 2014
Solve any one question from Q1 & Q1 (e)
1 (a)
Write the major difference between:
i) Ideal voltage source and practical voltage source
ii) Dependent and independent sources
i) Ideal voltage source and practical voltage source
ii) Dependent and independent sources
2 M
1 (b)
Define :
i) Impedance and
ii) Phase sequence in a.c. circuit.
i) Impedance and
ii) Phase sequence in a.c. circuit.
2 M
1 (c)
Explain with units and
i) Real power
ii) Reactive power
iii) Apparent power in a.c. circuit.
i) Real power
ii) Reactive power
iii) Apparent power in a.c. circuit.
3 M
1 (d)
Derive the relation for conversion for star and delta connection.
7 M
1 (e)
State Thevenin?s theorem. Determine the current through a 3Ω resistor branch in the circuit using Thevenin?s theorem.
14 M
Solve any one question from Q2 & Q2 (e)
2 (a)
Define magnetic leakage and fringing.
2 M
2 (b)
Give the reason of eddy current loss in transformer core.
2 M
2 (c)
Define voltage regulation and efficiency of a transformer. Give the formula also.
3 M
2 (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.
7 M
2 (e)
The results of tests performed on 1ϕ, 20 KVA, 2200/220 volt, 50 Hz. Transformer are as follows-
O.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.
O.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.
14 M
Solve any one question from Q3 & Q3 (e)
3 (a)
Write the necessity and material used for the following in a d.c. machine
i) Commutator
ii) Brush
i) Commutator
ii) Brush
2 M
3 (b)
Why synchronous machine is called as synchronous. Define synchronous speed.
2 M
3 (c)
Classify self excited D.C. motor.
3 M
3 (d)
Derive the e.m.f. equation of a 3 phase Induction Motor.
7 M
3 (e)
Draw and explain the complete Torque-slip characteristics of 3 phase induction motor.
14 M
Solve any one question from Q4 & Q4 (e)
4 (a)
State and explain De Morgan?s theorem.
2 M
4 (b)
Simplify the Boolean function Z = AB + AC + BC and therefore design the logic circuit using AND or OR logic gates.
2 M
4 (c)
Explain half adder and full adder with truth table.
3 M
4 (d)
Explain number systems used in digital electronics.
7 M
4 (e)
Explain in detail J-K flip flop.
14 M
Solve any one question from Q5 & Q5 (e)
5 (a)
Define ideal diode and practical diode.
2 M
5 (b)
Differentiate between conductor, semiconductor and insulator with example.
2 M
5 (c)
Draw and explain the V-I, characteristic of diode.
3 M
5 (d)
Draw the connection diagram and explain the use and working of CE transistor configuration.
7 M
5 (e)
Explain the working of BJT. Discuss DC biasing of BJT.
14 M
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