OPTICS AND SPECTROSCOPY III INTERNAL QUESTION

OPTICS AND SPECTROSCOPY - 4BPH4C1
III INTERNAL TEST

PART –A  5 x 2 =10 MARKS
1.GIVE THREE METHODS OF MINIMIZING SPEHERICAL ABERRATION.
2. STATE STOKES LAW
3. STATE RAYLEIGH CRITERION FOR RESOLUTION.
4. DEFINE SPECIFIC ROTATORY POWER.
5. WHAT ARE STOKES AND ANTI STOKES LINES?

PART – B 4 x 5 = 20 MARKS
6. EXPLAIN THE CONSTRUCTION AND WORKING OF A DIRECT VISION SPECTROSCOPE.
7. EXPLAIN HOW THE JAMIN INTERFEROMETER IS USED TO STUDY THE REFRACTIVE INDICES OF GASES AT VARIOUS PRESSURES.
8. GIVE THE THEORY OF HALF WAVE PLATE.
9. DISCUSS THE QUANTUM THEORY OF RAMAN EFFECT.

PART – C 2 x 10 = 20 MARKS
10. DERIVE THE CONDITIONS TO PRODUCE (I) DISPERSION WITHOUT DEVIATION AND (II) DEVIATION WITHOUT DISPERSION IN  COMBINATIONS OF PRISMS.
11. EXPLAIN FRESNEL DIFFRACTION AT A CIRCULAR APERTURE.

ANALOG ELECTRONICS III INTERNAL QUESTION

ANALOG ELECTRONICS - 4BPH5C1
III INTERNAL TEST
PART –A  5 x 2 =10 MARKS
1. WHAT IS DOPING?
2. DRAW THE SYMBOL OF ZENER DIODE.
3. DEFINE BAND WIDTH
4. WHAT IS THE ADVANTAGE OF USING NEGATIVE FEEDBACK IN AMPLIFIRES?
5. DEFINE CMRR.

PART – B 4 x 5 = 20 MARKS
6. EXPLAIN VOLT-AMPERE CHARACTERISTICS OF ZENER DIODE.
7. EXPLAIN THE h PARAMETERS OF A TRANSISTOR.
8.  COMPARE DIFFERENT TYPES OF COUPLING IN MULTISTAGE AMPLIFIER.
9.  DESCRIBE THE WORKING OF A PHASE SHIFT OSCILLATOR WITH NEAT DIAGRAM.

PART – C 2 x 10 = 20 MARKS
10. DISCUSS AC AND DC EQUIVALENT CIRCUITS OF A TRANSISTOR AMPLIFIER.
11.  DESCRIBE THE WORKING OF COLPITTS OSCILLATOR.

Barkhausen Criterion



Barkhausen criterion states that for sustained oscillations the product between the open loop gain and and the feedback fraction must be unity at the resonant frequency. Viz.,

AOLβ=1

Analog Electronics Test - I - Assignment Questions

1. What is a Semiconductor ?
2. Define Ripple Factor.
3. Draw the symbol of PNP and NPN Transistor.
4. Define operating point of a Transistor.
5.What is phase reversal in CE amplifier?
6.What is negative feedback?
7.Define input impedance of a transistor amplifier.
8.State Barkhausen criterion for obtaining sustained oscillations.
9.What are extrinsic semiconductors?
10.What is doping?
11.Define Bandwidth.
12. Define current gain of a transistor amplifier in CC mode.
13.What is a tank circuit?
14. Draw Zener diode characteristics under reverse bias.
15.Define load line.

Could Somebody Guess What is this ?

WHAT IS THIS?

White LED Spectrum

WHITE LED SPECTRUM OBTAINED FROM AN LED FROM LAPTOP DISPLAY


ABOVE SPECTRUM PROCESSED AND PLOTTED AS A HISTOGRAM WITH APPROXIMATE WAVELENGTH SCALE  (PROCESSED USING IMAGEJ SOFTWARE)

WHITE LED  SPECTRUM FROM LITERATURE

Optical Aberrations

Analog Electronics Model Question

Department of Physics - Dr.Zahir Husain College, Ilayangudi
Analog Electronics – 1BPH5C1

Time: 3 Hours                                                                           Max Marks: 75

   Part – A (10 x 2 = 20)
Answer All the Questions
1. How diode acts as a rectifier?
2. Draw the special current-voltage characteristics of Zener diode.
3. Why the collector region is larger than the emitter region in a transistor?
4. Write brief note on transistor action.
5. Draw the circuit diagram of single stage amplifier circuit.
6. Define band width.
7. State any two differences between voltage and power amplifiers.
8. Write note on feed back.
9. List out the characteristics of an ideal op-amp.
10. Draw the circuit diagram of a non-inverting amplifier.

   Part – B (5 x 5 = 25)
Answer All the Questions
11.  Discuss the working of a half wave rectifier.
(OR)
    Discuss the formation of depletion layer in PN junction.
12. Write note on cut-off and saturation point.
(OR)
Describe the feedback resistor method of biasing a transistor.
13. Draw the DC equivalent circuit of a transistor amplifier and explain its function.
     (OR)
      Explain RC coupling in a multistage amplifier.
14. Explain the phenomenon of phase reversal in a transistor amplifier.
(OR)
        Write note on class A amplifier.
15. Discuss the working of an op-amp adder.
(OR)
How an op-amp is used as a triangular wave generator?


   Part – C (3 x 10 = 30)
Answer any three Questions
16. (a)Describe the function of Zener diode as a voltage regulator.
        (b)Derive an expression for the efficiency of bridge rectifier.
17. (a)Compare CE,CB and CC transistor configurations.
        (b)Write note on load line.
18. (a)Describe the function of direct coupled multistage amplifier.
        (b) In an amplifier, the maximum voltage gain is 2000 and occurs at 2 kHz. It falls to 1414 at 10        kHz and 50 Hz. Find : (i) Bandwidth (ii) Lower cut-off frequency (iii) Upper cut-off frequency.
19. a)Explain the function of Colpitts oscillator.
       (b) Find the capacitance of the capacitor required to build an LC oscillator that uses an                          inductance of L= 1 mH to produce a sine wave of frequency 1 MHz.
20. (a)Explain how an op-amp is as an integrator and scale changer.
        (b)Feedback resistor of an inverting amplifier has the value of 100 k ohm and the input resistor             has the value of 2 k ohm. If a sinusoidal wave of peak-to-peak voltage 50 mV is given as input         plot the output wave form.




Optics and Spectroscopy Model Question

Department of Physics - Dr.Zahir Husain College, Ilyangudi.
Optics and Spectroscopy –4BPH3C1

Time: 3 Hours                                                                                 Max Marks: 75

   Part – A                     (10 x 2 = 20)
Answer All the Questions

  1. Give three methods of minimizing spherical aberration.
  2. Explain briefly about coma
  3. What is an air wedge? State its uses.
  4. State Stoke’s law.
  5. Distinguish Fresnel and Fraunhofer Diffraction.
  6. State Rayleigh criterion for resolution
  7. What is a quarter wave plate?
  8. Define specific rotation or specific rotary power.
  9. What is a spectrum?
  10. Write note on Stokes lines.
   Part – B                     (5 x 5 = 25)
Answer All the Questions

11. Discuss the principle of aplanatic lens.
(OR)
Describe how achromatic doublet reduces chromatic aberration.

  1. Describe color formation due to thin film interference.
(OR)
Explain the working of Rayleigh interferometer.

13. Explain Fresnel diffraction light at a circular aperture.
     (OR)
            Derive an expression for the resolving power of a grating.
     
  1.  Discuss Huygens theory of double refraction at a uniaxial crystal.
(OR)
            Give the theory of half wave plate.
      15.  Give the theory of origin of pure rotational spectrum
                                                                                   (OR)
            Derive an expression for the rotational energy of a rigid diatomic molecule.


   Part – C                     (3 x 10 = 30)
Answer any three Questions

  1. Define angular dispersion and dispersive power. Derive the conditions to produce (i) deviation without dispersion and (ii) dispersion without deviation in combination of prisms.


  1. Explain the working of Michelson Interferometer. How the wavelength of a monochromatic light can be determined?


  1. Give the theory of plane transmission grating. Describe an experiment to determine the wavelength of sodium light.


  1. Describe Laurent’s half shade polarimeter. Explain how specific rotary power is determined.



  1. Discuss the quantum theory of Raman effect.

Analog Electronics Question Set

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