Rajasthan Technical University 2009-1st Year B.E Biotechnology (Annual) (Back) , y- - exam paper
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B. E. f - Year (Annual) (Back) Examination, July - 2009 | |
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107: Elect. & Electronics Engg. | ||
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Time |
3 Hours] |
[Total Marks: 80 |
[Min. Passing Marks : 24 Attempt five questions in all. Schematic diagrams must be shown wherever necessary. Any data you feel missing may suitably be assumed and stated clearly.
Use of following supporting material is permitted during examination. (Mentioned in form No.-206)
1 lefr Stilt*'antagqptaiB tto fbevenin's theorem with example.
(b) Compute the power dissipated in the 12 2 resistoi* in the figure below by applying superposition theorem.
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(a) State and explain the superposition theorem with example.
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(b) Find the Thevenin equivalent of the circuit given below as seen at terminals ab.
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(a) If a sinusoidal e.m.f. e = Esin cot is applied across a series "" RL circuit, what is the equation for current ? Derive, also
power consumed in such a circuit.
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(b) A resistor R in series with a capacitor C is connected to a 50 Hz, 240 V supply. Find thfr value of C so that R absorbs 300 W at 100 V.
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Fig. 3 OR
Derive with neat circuit and phasor diagrajna, the relationship between the phase and line voltages and currents for a balanced three phase delta connected load, and hence deduce an expression for the total three phase pcrfrer in terms of the line voltage, the line current and the power factor.
f two Wattmeter method for
(b) How power canbQ
. (W|-Wt) (W,+Wj)
/ (a) What is working principle of 1-+ transformer ? Derive the / EMF equation for 1-$ transformer.
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(b) A 250 kVA, 11000/415 V, 50 Hz single phase transformer has 80 turns on the secondary.
Calculate :
(i) The approximate values of the full load primary and secondary currents.
(ii) The approximate number of primary turns.
(iii) The max. value of the flux.
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OR
Explain different types of torques presents in indicating type of measuring instruments.
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(b) Explain the construction and working principle of /electrodynamometer type instruments.
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4 (a) Draw the V-I characteristics of a junction diode and explain
the cut in voltage and peak inverse
(b) Explain with a neat circuit diagram, the working of a bridge rectifier and deduce expression for its ripple factor and efficiency. What are the advantages of this rectifier over the full wave rectifier using two diodes ?
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/' (a) Describe zener breakdown mechanism. How is it difficult trom avalanche breakdown ? Draw a zener diode voltage requlator circuit to regulate the voltage across a load resistance. Explain its working.
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Explain drffepfc type? flf, filters used in electronic circuits.
5 Wf For CE configuration, prove that Ic~Pibt'HP+1)ic0 In v/ common base configuration the emitter current is 1.6 mA.
The collector current with emither circuit open is 10 nA. Determine the total collector current.
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(bj/'What are the three configurations of transistor amplifier ? Compare them with regard to their input impedance, output impendance, current and voltage gain.
5 (a) Explain with the help of a suitable diagram, the principle of operation of an oscillation. State and explain the criteria _ for sustained oscillations.
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(J>) Explain the function of modulation and demodulation in a < communication system.
[ 3000 ]
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| Earning: Approval pending. |
