Stability Factor and Its Importance

The rate of change of collector current IC with respect to the collector leakage current ICBO is called stability factor, denoted by S. 

Stabilization of operating point is important due to temperature dependence of Ic, individual variations of transistor parameters and thermal runaway.

Hybrid Parameters - h Parameters

The hybrid parameters determine transistor amplifier characteristics such as voltage gain, current gain, input and output impedance etc.Every linear circuit can be analyzed as two port networks.Four parameters called hybrid parameters or h-parameters can be used to describe these networks.One parameter is measured in ohm and another parameter is measured in mho and other two parameters are dimensionless.As these parameters have mixed dimensions they are called hybrid parameters.

OPTICS AND SPECTROSCOPY - II INTERNAL TEST

Optics and Spectroscopy - 7BPH3C1

 II Internal Test

Time : 2.5 Hrs                                                                                                                         Marks: 40

                                                                        PART - A                                                        5 x 2 = 10

1. List the uses of air wedge.

2. State Rayleigh Criterion for resolution.

3. Define resolving power of a prism. 

4. State any two differences between Fresnel and Fraunhofer diffraction.

5. Define specific rotatory power.

                                                                       PART - B                                                      2 x 5 = 10

1.Derive an expression for resolving power of grating.
2. Explain Fresnel diffraction at a circular aperture.

                                                                         PART - C                                                     2 x 10 = 20

1. Describe Fraunhofer diffraction at a double slit.
2. Give the theory of plane transmission grating. Describe an experiment to determine the wavelength of sodium lines.

ANALOG ELECTRONICS - II INTERNAL TEST

Analog Electronics - 4BPH5C1

 II Internal Test

Time : 2.5 Hrs                                                                                                                         Marks: 40

                                                                        PART - A                                                        5 x 2 = 10

1.Draw the symbol of a PNP and NPN transistor.

2.Define current gain in CE mode.

3.What is stability factor? Give its importance.

4.What are h parameters?

5.Give the difference between voltage and power amplifier.

                                                                       PART - B                                                      2 x 5 = 10

1.Describe voltage divider bias.
2.Describe AC and DC equivalent circuits of CE transistor amplifier.

                                                                         PART - C                                                     2 x 10 = 20

1.Describe in detail load line analysis of a CE amplifier. Also derive expressions for voltage gain and input impedance.  
2. Explain the working of an RC coupled CE amplifier. List out its merits and drawbacks.