In: Electrical Engineering

Draw and explain working of BJT monostable multivibrator. Draw the voltage wave form of Base 1,Base 2,collector 1and collector 2.calculate the delay time T forwhich the circuit will remain in quasistable-state after triggering (12 Mark)

What is the difference in the voltage output of
a BJT Transistor switch circuit and a
BJT Emitter follower circuit?

1. A sinusoidal voltage wave on a transmission line has real
amplitude, V_0. The wave is expressed in phasor form as
V_s(z) = V_0*e^(-alpha*z)*e^(-j*(beta)*z)
a. In which direction does this wave propagate and why?
b. Express the given wave in real instantaneous form.
c. The parameters of the line, operating at ω= 6.0×10^8 rad/s
are L = 0.350 μH/m, C = 40.0 pF/m, G = 0 and R = 15.0 Ω/m. Find
α,β,λ, andZ_0 (in magnitude and phase).
d. Calculate...

Sketch the equilibrium band structure of pnp bipolar junction
transistor (BJT). In point form, explain how
the application of a bias voltage at the “base” changes the band
structure that you have drawn and can be
used to turn this device “on” and “off”. (a well-labeled
equilibrium diagram will enable you to complete this without
any further band-structure diagrams)

5) Wave on transmission lines
(a) Derive wave equations for voltage and currents over the
transmission lines.
(b) Solve for general solutions
(c) Indicate the definition of characteristic impedance

Sketch the general form of the
spectrum of a typical PWM wave and explain the principle behind
using the PWM method to achieve variable voltage and frequency
generation using inverter circuits. Show how 3-level PWM signals
for driving a single-phase inverter may be generated using the
natural sampling technique. Explain why, despite its simple
concept, the natural sampling is not generally used in a digital
implementation. Make assumptions where necessary.

Explain with the aid of diagrams, the operations involved in
converting an analog wave form into a sequence of bits

Give an example on industrial application to the BJT with some
explanation and draw the circuit diagram for the application which
you chose

) For a npn BJT structure. a) Name the semiconductor types,
biasing types (Plot base, emitter and collector and voltage
polarities) for active mode. Plot the band diagram of BJT in
equilibrium. b) Plot clearly BJT structure and charge flow to
explain the function of base current.

2. (a) What is an electromagnetic wave?
(b) Draw a visual representation of an electromagnetic wave.
(c) What is the speed of an electromagnetic wave?

In the following graph of a sine wave, the Y-axis is voltage (Volts) and the X-axis is time seconds). What is the voltage amplitude? What is the phase shift in seconds?What is the phase shift in degrees?What is the phase shift in radians?

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