BNA-013 : ELECTRICITY AND ELECTRONICS Maximum Marks : 70
Time : 2 hours
Note : (i) Non - programmable scientific calculator is allowed. (ii) Attempt three questions from each section. (iii) Questions No. 1 and 5 are compulsory. SECTION - A (Electricity) 1.
2.
(a) Explain with neat sketch principle, construction and working of AC generator. (b) A 2000/200 V, 20 kVA transformer has 66 turns in the secondary. Calculate the primary turns and primary and secondary full load currents, neglecting losses.
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(a) State and explain Faraday's laws of electromagnetic Induction. (b) A solenoid of length 50 cm is uniformly wound with 500 turns of wire. If a current of 2 A is flowing in it, what is the flux density at its centre ? If the cross-sectional area of the solenoid is 4 cm2, what is the total magnetic flux set-up at its centre ?
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BNA-013
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P.T.O.
3.
(a) Explain R-L-C series circuit in AC circuit. (b) A moving coil meter has a resistance of 2 ohm and gives full scale deflection with 20 mA. Show how it can be used to measure voltage up to 250 V.
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4.
(a) State and explain ohm's law and its limitations.
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(b) An air cored solenoid has 300 turns its length is 25 cm and its cross section is 3 cm2. Calculate the self inductance in henry.
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SECTION - B (Electronics) 5.
6.
(a) Explain the term demodulation with necessary circuit diagram. What are essentials in demodulation ? (b) The antenna current of an AM transmitter is 8 A when only carrier is sent but it increases to 8.93 A when the carrier is sinusoidally modulated. Find the percentage modulation.
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(a) Explain the operation of transistor as an oscillator.
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(b) For a single stage transistor amplifier, the collector load is Rc = 2 k( and the input resistance Ri =1 ka If the current gain is 50, calculate the voltage gain of the amplifier.
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BNA-013
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(a) Draw the circuit of a practical single stage transistor amplifier. Explain the function of each component. (b) An amplifier, when loaded by 2 kfl resistor, has a voltage gain of 80 and a current gain of 120. Determine the necessary signal voltage and current to give an output voltage of 1 V. What is the power gain of the amplifier ?
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Write short notes on any two of the following : 2x5=10 (a) A. M. Radio Receivers (b) Light Emitting Diode (LED) (c) Piezo-Electric Crystal
No. of Printed Pages : 3 BNA-013 B.Sc. (NAUTICAL SCIENCE) Term ...
B.Sc. (NAUTICAL SCIENCE). O. Term-End Examination. O. June, 2014. O. BNA-013 : ELECTRICITY AND ELECTRONICS. Time : 2 hours. Maximum Marks : 70. Note : (i) Non - programmable scientific calculator is allowed. (ii) Attempt three questions from each section. (iii) Questions No. 1 and 5 are compulsory. SECTION - ...
No. of Printed Pages : 3. BNA-013. B.Sc. (NAUTICAL SCIENCE). O. Term-End Examination. O. June, 2014. O. BNA-013 : ELECTRICITY AND ELECTRONICS. Time : 2 hours. Maximum Marks : 70. Note : (i) Non - programmable ... (a) A. M. Radio Receivers. 2x5=10. (b
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