 MORE IN Basic Electrical & Electronics Engg
MU First Year Engineering (Semester 1)
Basic Electrical & Electronics Engg
May 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a) A resistor of 5Ω is connected in series with a parallel combination of a number of resistors each of 5ω. If the total resistance of the combination is 6ω find the no. Of resistors connected in parallel.
3 M
1(b) Use mesh analysis to find current through 10Ω in the ckt shown 3 M
1(c) An alternatinf voltage is represented by ?? = 141.4 sin 377 t
find (i) max-value (ii) frequency (iii) time period
3 M
1(d) What is the necessary condition for resonance in series circuit. Derive expression for resonance frequency.
3 M
1(e) What is the relationship between line and phase values in star and delta connected load.
2 M
1(f) Draw and explain the phasor diagram of 1-ϕ
4 M
1(g) Define rectifier and state diff. Types of it.
2 M

2(a) Find mode voltages. 6 M
2(b) In the circuit shown find
(i) the current I (ii) V1 and V2 (iii) Pf. Draw the phasor diagram. 8 M
2(c) A 150 KVA transformer has iron loss of 1.4 kW and full-load copper loss of 1.6kW. Det. (i) the KVA load at maximum efficiency (ii) max efficiency at 0.8 lagging Pf and (iii) efficiency at half load and 0.8 lagging Pf.
6 M

3(a) A balanced three-phase load connected in delta, drawn a power of 10kW at 440 V at Pf 0.6 lead, find the values of circuit elements and reactive volt-amperes drawn.
8 M
3(b) The wattmeter reads iron losses in OC test and reads copper losses in SC test of a transformer. Justify.
6 M
3(c) What is meant by filter.
2 M
3(d) Draw and explain O/P characteristics of transistor in CE configuration.
4 M

4(a) Using source transformation tech. Calculate voltage across 4Ω 7 M
4(b) Find the average and rms value of the waveform. 5 M
4(c) The power in a 3-ϕ
4 M

5(a) Find current through 30Ω using theveninis theorem 8 M
5(b) For the shown ckt, find supply current, current in each branch and total Pf. 4 M
5(c) A 1000/200 V, 50Hz, 1-phase transformer gave the following test results
OC test (hv side) : 1000V     0.24A     90W
SC test (hv side) : 50V     5A     110W
Draw equivalent ckt of transformer reffered to primary and secondary side.
8 M

6(a) Using superposition theorem, find the voltage accross 4KΩ 7 M
6(b) A series R-L-C circuit consists of R = 1000 Ω, L = 100 mH and C = 10μF. The applied voltage across the circuit is 100V.
(i) Find the resonance freq of the ckt.
(ii) Find Q of the ckt at resonant freq.
(iii) At what angular freq, do the half power points occur.
(iv) Calculate the bandwidth of the ckt.
7 M
6(c) Show that the total power and Pf. In a 3-ϕ
6 M

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