BSc Physics SEM III 2022 2023 Oct 2023 PHYSICS II Question Paper - Mumbai University | munotes

Questions asked in this paper

• ii) Figures to the right indicate full marks

1. Q1 A] Select the correct option: [12M]
   • 1) A differential amplifier
   • 2) An amplifier has a power gain of 100.Its dB gain is
   • 3) The volume of a sphere of radius 3R is
   • (a); (b) (c) (d) none
   • 4) If the value of the collector current Ic increases in CE configuration , then value of
   • 5) The value of the line integral grad (x + y — z)dr from (0,1,-1) to (1,2,0) is
   • (a)-1 (b)3 (c)O (d) none
   • 6)The work done by the forceF=yzi+zxj+xyk in moving a particle from point (1,1,1) to (3,3,2) along a path is
   • (c)17 (d)none Answer in one statement: [3M]
   • 1. What happens in case of cutoff region operation
   • 2. Give unit vector in the direction of A =
   • 3.Which IC is used to study Op-Amp?
2. Q1 C] Fill in the blanks: [5M]
   • 1)A necessary & sufficient condition that line integral f A.dr = 0 for every close curve C is
   • 2)Volume element in cylindrical system is
   • 3)The stability factor value for the base resistor bias is
   • 4)In sustaining oscillations, the loop gain should be
   • 5)The phase difference between the output & input voltages of CE amplifier is
3. Q2 A] Attempt any one: - [8M]
   • 2. S is the surface of the plane 2x+y+2z=3 in the first octant. A.n dS By using the divergence theorem evaluate F.ndS where F = & S is surface of the cube bounded by x= 0 to 1, y= 0 to 1 & z= Oto VCD/ SEM 100 MARKS
4. Q2 B] Attempt any one: - [8M]
   • 2. Check the fundamental theorem for gradients using 4xy + points A=(0,0,0),B=(1,1,1) and the three paths,
   • iii)The parabolic path z=x? ,
5. Q2 C] Attempt any one:
   • 1.State fundamental theorem of Curls with diagram
   • 2.Show that 0 when x=r are the
6. Q3 A] Attempt any one: - [SM]
   • 1. Explain any four advantages of Negative Feedback
   • 2.Describe de bias circuit with Emitter resistor for a transistor . Determine its stability factor State its advantages
7. Q3 B] Attempt any one: - [8M]
   • 1.Describe Voltage divider biasing for a transistor . Determine its stability factor .State its
   • 2.What is faithful amplification? State and explain any two conditions to be fulfilled to achieve faithful amplification in a transistorized amplifier,
8. Q3 C] Attempt any one: - [4M]
   • 1. A power amplifier has an input voltage peak to peak & an output voltage peak to peak across a load resistance of 8Q. The amplifier input resistance is Determine its
   • 2. Define amplifier.An amplifier has an input signal voltage 0.1V & draws from the amplifier delivers 5V to a load at 10mA.Determine the voltage, current and power
9. Q4 A] Attempt any one: - [8M]
   • 1.Draw labeled diagram of Colpitts oscillator & using this diagram determine the following
   • a)feedback fraction b)min. gain for sustain oscillations c)freq. of oscillation Use the foll lozg SEM 100 MARKS 3 HOURS
   • 2.By means of a neat circuit diagram explain the use of Op-amp as a Inverting amplifier. What is the input resistance of Op-amp used as inverting amplifier when its output is -12V,with input of ‘ 120mV. The feedback resistance is
10. Q4 B] Attempt any one: - [8M] the basic requirements of Sustained oscillations.Determine the operating frequency & feedback factor for Hartley oscillator,using the following
    • 2.Explain the architecture block diagram of a typical Op-amp.Calculate the output voltage of an Op-amp working as a ramp of 3V height drives the circuit and has width of 3msec.If the RyC time constant is 1 msec. for
11. Q4 C] Attempt any one: - [4M]
    • 1.Write a note on Hartley Oscillator
    • 2.Determine the output voltage of a non-inverting amplifier for & input
12. Q5 Answer the following: -[Any four] [20M] Explain an oscillator with a simple block diagram
    • 2.By means of a neat circuit diagram explain the use of Op-amp as a Non-inverting amplifier
    • 3.Determine the volume integral of the function over the tetrahedron with corners at 4A solid of constant density p=1 occupies the region S.Find the solids z-axis.Given: by the cone 5 It is desired to set the operating point at 4V,1.2 mA by biasing silicon transistor with collector feedback resistor B = 120, find the value of Rg
    • 6.Determine the open circuit voltage of the source,v, to provide an amplifier input voltage vj of when the internal resistance of the source is 502

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