BSc Physics SEM II ATKT 2018-19 ATKT Physics II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Use of non- programmable calculator is allowed
2. Q4 Symbols have their usual meanings unless mentioned
3. Q1 (A) Select the correct option 12 marks
   • i) The reactance of inductor of inductance 1H at
   • ii) Bridge is used for comparing inductance of unknown inductors
   • (c)Maxwell’s (d) Hay’s
   • iii) In half adder circuit, sum and carry are represented by outputs. of and gates respectively
   • (a) AND, OR (b) AND
   • (c) Ex-OR, OR (d) NAND, NOR
   • iv) The source delivers maximum power to the load when source
   • (a) greater than (b) less than load
   • (c) equal to load (d) equal to zero
   • v) The unit of the electric
   • (c) volt (d) all of the above
   • vi) The magnetic induction at the centre of circular coil having ‘n’ turns Answer in one sentence: 03
   • i) What is power factor in AC circuit?
   • ii) State the application of Zener diode
   • (C) the blanks 05
   • i). In LCR parallel AC circuit, at resonance the impedance of the circuit In Norton’s theorem entire linear network connected across two terminals can be replaced by equivalent in parallel with a single equivalent ili) internal resistance of ideal current source is
   • iv) and gates are called as universal building blocks
   • v) The surface over which the potential is constant is called 20BE3C4B76762B397A54AB3C6B994BD3
4. Q2 (A) Attempt any one 8 marks
   • i) Derive an expression for the impedance of the series CR circuit applied by alternating emf and hence draw its phasor diagram
   • ii) An alternating emf is applied to series LCR circuit. Derive an expression for its resonant frequency
   • (B) Attempt any one 08
   • i) What is an AC bridge? Obtain the conditions required to balance the
   • ii) Draw a neat circuit diagram and derive balance condition for
   • (C) Attempt any one 04
   • i) A-series LR circuit has an inductance of 0.2H and a resistance of 5Q connected across 200V AC at 50Hz. Calculate the impedance of the circuit and phase angle between emf and current
   • ii) In a Wien bridge, if and Ci=C2=0.022uF.Find the frequency of input voltage
5. Q3 (A) Attempt any one 8 marks
   • i) State Thevenin’s theorem and explain it in detail
   • ii) Draw a neat labeled diagram of Bridge rectifier. Explain its working and draw necessary waveforms
   • (B) Attempt any one 08
   • i) What are its types? Explain working of any one type of clipper with the help of diagram
   • ii) What are derived gates? Draw logic circuit, symbol and write truth table for any two of them
   • (C) Attempt any one 04
   • i) Simplify the expression Y = (A+B).(A+C) and design logic circuit for the
   • ii) Ina bridge rectifier, maximum secondary voltage is 136 V, 50Hz. Find dc load voltage, peak inverse voltage and output frequency
   • (A) Attempt any one 08
   • i) . Obtain an expression for potential energy of a discrete point charge
   • ii) an expression for the magnetic field produced by a current carrying circular loop at a point on its axis
   • (B) Attempt any one 08
   • i). Obtain. an expression for the potential of a localized charge 20BE3C4B76762B397A54AB3C6B994BD3
   • ii) Helmoltz coil? Obtain the condition for maximum and uniform magnetic induction at mid point on the axis of the coil
   • (C) Attempt any one 04
   • i) A beam of electron enters a uniform magnetic field of 0.1 Wb/m? with velocity of 2x10* m/s making an angle of with the field direction Calculate the radius of helical path traced by it
   • ii) Find the magnetic induction in air at 0.01 m from a wire that carries a current of 1 A. [ Given:
6. Q5 Attempt any four 20 marks
   • i) Show that in a pure resistive AC circuit, the emf and current are in
   • ii) Draw a neat circuit diagram of De Sauty’s AC bridge and write down the expression for balance condition
   • iii) Define efficiency of a rectifier. Find its value for half wave rectifier
   • iv) A 400 mW Zener diode with breakdown voltage negligible resistance. Find the maximum current it can carry. What is the current limiting resistance for this Zener to carry maximum current if supply voltage is 15 V
   • v) Two long straight wires carrying currents of 5A and 15A are separated by a distance of 100cm. At what the line joining the wires is the magnetic zero?
   • vi) Show that the work done in moving charge q from infinity to a point 20BE3C4B76762B397A54AB3C6B994BD3

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