STUPIDSID
1 (a)
Explain Hall effect phenomenon and list out its applications. Quantitatively
discuss the use of Hall effect to determine mobility.
7 M
1 (b)
Derive continuity equation for carrier concentration in body of a semiconductor.
7 M
2 (a)
Discuss the process of splitting of energy levels of isolated atoms into energy
bands as these atoms are brought into close proximity to form a crystal.
7 M
2 (b) 1
Draw diode I-V characteristic, discuss its temperature dependence and obtain
expression for diode dynamic resistance.
7 M
2 (c)
Explain working of Tunnel diode. Draw its I-V characteristic and symbol. List
out applications of Tunnel diode.
7 M
3 (a)
For a sinusoidal input of 10 V peak, sketch I R and V O in the circuit shown in Fig. Q. 3 (a). Assume ideal diode with cut-in voltage equal to 0.7 V.
7 M
3 (b)
Draw BJT circuit in common-base configuration as well as its input and output characteristics. Explain base-width modulation for the same.
7 M
3 (c)
A symmetrical 5 KHz square wave that varies between + 10 V and -10 V is impressed upon the clipping circuit shown in Fig. Q: 3(a) OR. Assume for diode: Rf (forward bias resistance) = 0, Rr (reverse bias resistance) = 2 MΩ, Cut-in voltage = 0. Sketch the steady state output waveform, indicating value of maximum, minimum, and constant portion.
7 M
3 (d)
In diode connected transistor circuit shown in Fig. Q: 3 (b) OR, the transistor has β = 19. If VE = 4 V, determine the value of RB . Neglect base-to-emitter junction voltage in the calculations.
7 M
4 (a)
Derive expression for AI , A V , Zi , and YO for a basic amplifier circuit in terms of h-parameters.
7 M
4 (b)
What do you understand bias compensation? Draw and explain diode
compensation circuit for VBE. .
7 M
4 (c)
Derive expression for AI , AV , Zi , and Y O for a common-collector amplifier circuit using simplified hybrid model.
7 M
4 (d)
Explain thermal runaway. Show graphically that thermal runaway cannot take place if the quiescent point is located at VCE < (1/2) VCC .
7 M
5 (a)
Draw two-dimensional structure of n-channel MOSFET. Explain its working.
7 M
5 (b)
Explain push-pull arrangement of transistors and discuss its advantages.
7 M
5 (c)
Explain the use of FET as a voltage variable resistor.
7 M
5 (d)
Draw transformer-coupled audio amplifier circuit. Show that the maximum
value of conversion efficiency for this circuit is 50%.
7 M
More question papers from Basic Electronics