BSc Physics SEM III ATKT 2017-18 ATKT Physics Paper II Question Paper - Mumbai University | munotes

Questions asked in this paper

• 2) Figures to the right indicate full marks

1. Q3 Use of non-programmable calculator is allowed
2. Q4 Symbols have their usual meanings
   • (A) Chose correct alternative among the four and rewrite the statement. 12
3. Q1 The gradient of a function (sin x + sin y ) is
4. Q2 The scalar factor of spherical co-ordinates
5. Q3 If base emitter junction is forward biased and base collector junction is reversed biased then operation of transistor isin 4
   • (c) cut-off region (d) none of these
6. Q4 An amplifier has a power gain of 100. Its dB gain is
   • (c) 10dB of these
7. Q5 When we introduce positive feedback to an amplifier the Gain - bandwidth
   • a) Increases b) decreases remains the same. D) can increase or decrease
8. Q6 Which of the following is required for oscillation? The phase shift around the feedback network must be or
   • c) Both BAv and the phase shift around the feedback network must be
   • d) None of the above
   • Q. P. Code:-20511
9. Q1 (B) Answer the following questions in one statement. 3 marks
10. Q1 Express the unit vectors #, , @ of cartesian coordinate system
11. Q2 What is meaning of phase reversal?
12. Q3 What is Op-Amp comparator?
13. Q1 (C) the blanks. 5 marks
14. Q1 The line integral is also known as integral
15. Q2 Co-ordinate is the azimuth angle of the plane containing the point P and axis; measured from XZ plane in the right hand screw sense
16. Q3 It should be ensured that collector emitter voltage not fall below V for
17. Q4 A voltage follower has a voltage gain of
18. Q5 In an ideal op-amp integrator if the input 1s square wave then the output waveform will be
19. Q2 (A) Attempt any One 8 marks
20. Q1 State and explain fundamental theorem for curl. Give its geometrical and physical interpretation. Give one example
21. Q2 Verify Stoke’s theorem for the function F y integration round the square in the plane Z= 0 whose sides are along the lines ,y=0, x=a
22. Q2 (B) Attempt any One 8 marks
23. Q1 With the help of diagram explain cylindrical polar co-ordinates
24. Q2 Obtain an expression for the divergence of a vector function in spherical polar Attempt any One ( 04)
25. Q1 Obtain expression for infinitesimal surface area of a sphere of radius ‘r’ and centre at origin
26. Q2 Find total work-done by the force F = (zyf+ xy f) Nin moving a particle along the straight line path from O (0,0) toP (2, 1)
    • Q. P. Code:-20511
27. Q3 (a) Attempt any One 8 marks
    • (i) Draw voltage divider bias circuit and its Thevenin equivalent Obtain the expressions for and base current Ip, collector voltage Vc, Vce,
    • (ii) Explain the effect of negative feedback on stability, distortion and output resistance of an amplifier
28. Q3 (b) Attempt any One 8 marks
    • (i) bias circuit is subjected to an increase in temperature from to
    • C. If B = 100 at and B = 150 at determine the percentage change in Q-point values (lc and over this temperature neglecting change in Vee and leakage current. Given: Vcc = 9 V, kN and
    • (ii) Write general theory of feedback
29. Q3 (c) Attempt any One ( i) the concept of thermal runaway has an input signal voltage Vi V and draws 1 mA from the source. The amplifier delivers 10 V to a load at 25 mA. Determine voltage and 4 marks
30. Q4 Attempt Any One i Draw circuit of RC phase shift oscillator using BJT. Derive the expression for the frequency of oscillation ii Describe with neat circuit diagram working of Colpitt’s oscillator. Derive the expression for the frequency of oscillation Attempt Any One (8) 1 Explain, with neat circuit diagram, the non-inverting amplifier using OPAMP and derive the expression for the Output Voltage ii Describe with neat circuit diagram OPAMP integrator. What is critical frequency of an integrator? 8 marks
    • C. Attempt Any One iA Hartley oscillator produces an output at a frequency of Given and find the value of L Calculate the value of C and feedback resistor for a typical Wien-bridge oscillator, if R = 7950 Q, Ri = 10 KQ and oscillator frequency of 2 KHz 4
    • Q. P. Code:-20511
31. Q5 Attempt any Four 20 marks
32. Q1 Write a note on Surface integrals
33. Q2 Obtain the expression for gradient of a scalar function in terms of cylindrical co
34. Q3 Write a short note on proper zero signal collector current
35. Q4 Explain the concept of input resistance of an amplifier
36. Q5 An op-amp is used as 3 input inverting adder with Ri = Rr = 5 KO V, V, andV, =+4.5V find the output voltage. If the Ri value is reduced to 2 KQ, keeping the same, what will be new output voltage?
37. Q6 Determine the maximum frequency that may be used in op-amp with slew rate of The amplifier circuit has Rr = 200KQ and Rj = 10 and input voltage Vi =0.02 V having angular frequency of 3 X rad/s. State whether this input will give distorted output or not

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