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714 B.Tech. Civil (Water Resources Engineering)NOerm-End ExaminationOune, 2 0 11E T -202(B) : PRINCIPLE S OF ELE CT RICAL

S C I E N C E STime : 3 hoursaximum M arks : 70Note : Answer any five questions. Sym bols and abbreviations

have their usual meaning. U se of calculator is permitted.1.a) Explain the principle of superpositiontheorem.

(b) Find the current drawn from the batterysource for the circuit show n in Fig. 1.

B.Tech. Civil (Construction Management) /

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24 V

Figure -12. (a) Express the following phases in

(i) rectangular and (ii) polar coordinateV (t) = 2 00 sin (cot + 60)

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(b) Draw the power triangle comprising RealPower P, Reactive Power Q and ApparentPower S.

(c) A 440 V, 50 Hz, 4 pole, three phaseinduction motor is rotating at a speed of1440 rpm. Find the percentage slip.

3.a) Explain the operation and characteristics ofdc shunt motor. Give its applications.

(b) Explain the principle of operation of singlephase transformer. Mention the salientdifferences between (i) Power transformer,(ii) Distribution transformer in theirconstruction and operation.

(c) What is instrument transformer ? State itsspecial features.

4.a) Name the instruments required to measure.

(i) Alternating current (ac)(ii) Direct current, (dc)(iii) ac voltage(iv) dc voltage(v) dc power,(vi) ac power,(vii) dc energy(viii) ac energy

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(b) State and describe briefly ten (10)components used in a typical industrialelectrical installations.

(c) Draw the schematic block of a typical largeunit for an industry. Explain its parts inbrief.

5.a) Draw and explain a full wave diode based

rectifier circuit, with waveforms.(b) Explain the operation of transistor as anamplifier.(c) An opamp has 60 dB gain. The output

voltage of the differential amplifier is 10 volt.Determine the input voltage.

6 .a) Draw a Half-Adder, state its truth table and

explain the operation.(b) Find the decimal equivalent of (101010)2.(c) What is Stack Pointer, Program Counter,Interrupt and Register as applied to

microprocessor.

7.a) Write short notes on any two :+6(i) Rectifier instrument

(ii) Synchronisation(iii) Speed control of dc series motor(iv) Cathode Ray Oscillator (CRO)

(b) The reading of two watt meters connectedto measure three phase power consumptiongave the reading asW1 = 350 WattW 2 = 1200 WattCalculate the power factor of the load.

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