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Pune University - SY BSc (Sem - I) PHYSICS - II : Electronics, April 2010

3 pages, 25 questions, 1 questions with responses, 1 total responses,    0    0
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Total No. of Questions : 4] [Total No. of Pages : 3 P261 [3717] - 104 S.Y. B.Sc. (Sem. - I) PHYSICS PH - 212 : Electronics (Paper - II) (New) Time : 2 Hours] [Max. Marks : 40 Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of calculators and log-tables are allowed. 4) Neat diagrams must be drawn wherever necessary. 5) Symbols have their usual meanings. Q1) Attempt all of the following: a) Define capacitance of conductor. Give its unit. [1] b) State maximum power transfer theorem. [1] c) Define current amplification factors d) In a common - emitter configuration of transistor, the change in collector current is 2.5 mA for change in base current of 10 A. Find . [1] e) Find the resistance of a aluminium wire 100 m long and having a cross sectional area of 1.04 mm2 if its resistivity is 2.7 10 8 - m. [1] f) Draw pin diagram of IC - 741. g) Calculate the gain of an inverting amplifier. The value of input resistance is 11k and that of feedback resistor is 110k . [1] h) State different types of rectifiers. i) If the d.c. output voltage is 330V with no load attached to power supply but decreases to 240V at full load. Find the percentage voltage regulation. [1] j) Convert binary number (11101)2 to decimal number. and of transistor. . [1] [1] [1] [1] P.T.O. Q2) Attempt any two of the following: a) What is UJT? Draw the equivalent circuit and explain the working. [5] b) Explain input and output characteristics of common - emitter configuration of a transistor. [5] c) Explain with circuit diagram Op-Amp as an adder. [5] Q3) Attempt any two of the following: a) Using Thevenin s theorem, determine the current flowing through load resistor RL of the network given below. [5] b) In a negative feedback amplifier, gain without feedback is A = 50, B = 0.08 and input Vi = 50 mV. [5] Find i) ii) Gain with feed back Output voltage. iii) Feedback factor. iv) Feedback voltage. c) Using Zener diode, find the current flowing through diode of following circuit, when the load resistance is (i) 20k and (ii) 2k . [5] [3717] - 104 2 2 Q4) a) Attempt (i) or (ii) of the following: i) State and verify De - Morgan s first theorem. Draw the necessary logic diagram. [4] 1) Explain different parameters of Op - Amp. [4] 2) b) Explain transistor as a switch. 2) ii) 1) [4] Explain AND and OR gate with symbol and truthtable. [4] Attempt any one of the following: i) Explain colour code method to find resistance of resistor. [2] ii) Explain series voltage divider circuit. [2] Y [3717] - 104 3 3

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Additional Info : S.Y. B.Sc. Physics (Semister - I), PH - 212 : Electronics (Paper - II) (New Course), Pune University
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