Draw a circuit using AND, OR and NOT gate to realize the following truth table:
| \text{INPUTS} | \text{OUTPUT} | ||
| A | B | C | Y |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 1 |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 0 | 1 |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 1 | 1 | 1 |
cse-1994-subject-08-004
What is the difference between the frequency spectrum of amplitude modulated wav and frequency modulated waves? Give a circuit for the detection of frequency modulated waves.
cse-1994-subject-08-003
Explain the construction and working of a p -n junction solar cell.
cse-1994-subject-08-002
Show that in the non-degenerate approximation the Fermi level in an n-type semiconductor is slightly below the bottom of the conduction band and in p-type it is slightly above the top of the valence band, but in both cases it remains within the band gap.
cse-1993-subject-08-002
Describe and explain the theory and operation of the Zener diode. Explain what is meant by (i) Avalanche breakdown (ii) Zener breakdown
cse-1993-subject-08-004
Describe the characteristics of grounded emitter transistor amplifier circuit and determine expression for (i) Input resistance (ii) Output resistance (iii) Current gain (iv) Voltage gain (v) Power gain
cse-1993-subject-08-003
Explain ferrimagnetism. How is it different from antiferromagnetism?
cse-1993-subject-08-001
What is the role of transistor in an amplifier?
cse-1992-subject-08-006
Write a short note on zener diode.
cse-1992-subject-08-001
What will happen to output voltage of an amplifier if a part of the output is returned to the input (i) in phase (ii) 180^\circ out of phase ?
cse-1992-subject-08-003
Write a short note on superconductivity.
cse-1992-subject-08-002
Write a short note on Para and ferromagnetism.
cse-1992-subject-08-007
Explain the formation of potential barrier in an unbiased p-n junction.
cse-1992-subject-08-005
If a signal from a high impedance source is to be amplified, which configuration is preferred and why?
cse-1992-subject-08-004
Why do the electronic energy level in a solid form bands? Describe in terms of the band theory the difference between a conductor, an intrinsic semi-conductor and an insulator. How does the energy level change when some impurities are introduced in a semiconductor? Explain how by doping you have both n-type and p-type semiconductors starting with pure Germanium. The band gap in cases of Germanium is about 0.8\text{ eV} at Ok. Neglecting the variation of band gap with temperature, make a rough estimate of the temperature at which the resistance of a pure Germanium sample will be reduced to 1/e times its value at 300k.
cse-1991-subject-08-001
What is superconductivity? In what kind of materials is it found to occur? Name some parameters which characterise a superconductor. Cite any two major use if we succeed in making superconductors with T_c not far atmospheric temperatures.
cse-1990-subject-08-003
Write a brief scientific note on Logic gates and their applications.
cse-1990-subject-08-004
How is a p-n junction prepared? Explain the charge and potential distributions in such a junction in open circuit. Explain how a p-n junction can be used to build a solar cell. Describe the mechanism of the increase of conductivity of Germanium by doping it with Arsenic.
cse-1990-subject-08-001
Write a brief scientific note on Transistor as an amplifier.
cse-1990-subject-08-002
State the difference in the electronic energy states in an isolated atom and in a solid. Hence explain difference between a conductor, an insulator and an intrinsic semiconductor. What is the role of impurities in so-called extrinsic semiconductors?
cse-1989-subject-08-002