Explain the basic distinction between a perfect conductor and a superconductor.
cse-1997-subject-08-004
Draw the circuit of an emitter-follower and find its voltage gain.
cse-1997-subject-08-003
Four silicon diodes are connected as shown in Fig. 1. A sinusoidal voltage of amplitude 2\text{ V} is applied in the input. What is the waveshape of the output and its amplitude? If the amplitude of the input voltage is reduced to 1\text{ V}, what will be the waveshape of the output and its amplitude ? Threshold voltage of each diode is 0.6\text{ V}.
cse-1997-subject-08-002
Assuming that for a paramagnetic material, the magnetic susceptibility is inversely proportional to temperature in Kelvin, obtain Curie-Weiss law for the paramagnetic phase of a ferro-magnetic material.
cse-1997-subject-08-001
Simplify the following logic function and draw the corresponding logic gates: Y = A.B + B.\overline{C} + \overline{A}.B + \overline{A}.C + \overline{B}.\overline{C} + \overline{A}.\overline{B}.\overline{C} + A.B.C
cse-1997-subject-08-005
A Si BJT is connected as shown Fig . Show that it is in active region and works as an amplifier Calculate its mid frequency gain, given that BJT has h_{ie} = 1\text{ k}\Omega, h_{oe} = h_{re} = 0, I_{co} = 20\text{ nA}.
cse-1996-subject-08-002
Derive the expression for the frequency spectrum of a carrier wave of frequency f_c which is amplitude modulated by a frequency f_m. A certain transmitted radiates 9\text{ kW} of power when the carrier wave is unmodulated and 10.12\text{ kW} power when the carrier wave is sinusoidally modulated. Calculate the modulation index.
cse-1996-subject-08-001
Define ex-OR. Give its truth table and draw the possible logic blocks.
cse-1996-subject-08-003
How does build in potential appear across a p-n junction? Explain under what biasing conditions drift and diffusion currents, respectively, dominate.
cse-1995-subject-08-001
Draw the block diagram of a superhetro dyne radio receiver and explain the function of local oscillator.
cse-1995-subject-08-002
Establish the two Barkhausen conditions for sustained sinusoidal oscillations. Sketch the circuit of Wien's bridge oscillator and explain its working.
cse-1995-subject-08-003
Derive an expression for magnetic susceptibility below Neel's temperature for a ferromagnetic substance.
cse-1994-subject-08-001
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
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
Explain the construction and working of a p -n junction solar cell.
cse-1994-subject-08-002
Explain ferrimagnetism. How is it different from antiferromagnetism?
cse-1993-subject-08-001
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
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
What is the role of transistor in an amplifier?
cse-1992-subject-08-006