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Electric Circuits
State the Barkhausen criterion for sustained oscillation. Explain the operation of
Colpitt Oscillator. For a Colpitt oscillator with 10 MHz frequency determine the
equivalent capacitance, C forming tank circuit with 0.1 mH inductor.
Colpitt Oscillator. For a Colpitt oscillator with 10 MHz frequency determine the
equivalent capacitance, C forming tank circuit with 0.1 mH inductor.
Electric Circuits
Which processes are responsible for the charge carrier transport in a semiconductor?
Which of these govern in the case of a bulk semiconductor when no potential is
applied?
Which of these govern in the case of a bulk semiconductor when no potential is
applied?
Electric Circuits
1. State, with reasons, whether the following statements are True or False.
i) Ideal voltage source has infinite internal resistance.
ii) Transformer is a passive device hence it cannot increase the voltage.
iii) Field effect transistor (FET) is a current controlled device.
iv) Forward biasing of a semiconductor junction diode reduces its energy band gap.
v) Amplifier with common collector mode offers maximum voltage gain.
vi) Ripple factor of a center tapped full wave rectifier is greater than that of a bridge
rectifier, which uses four diodes.
vii) Operational amplifier in non-inverting mode cannot amplify negative signals.
viii) IC LM380 is a small signal amplifier used to amplify the voltage.
ix) Largest decimal number represented by a 2-digit hex number is 99.
x) In a CRO sweep generator output is given to the vertical deflection plates.
i) Ideal voltage source has infinite internal resistance.
ii) Transformer is a passive device hence it cannot increase the voltage.
iii) Field effect transistor (FET) is a current controlled device.
iv) Forward biasing of a semiconductor junction diode reduces its energy band gap.
v) Amplifier with common collector mode offers maximum voltage gain.
vi) Ripple factor of a center tapped full wave rectifier is greater than that of a bridge
rectifier, which uses four diodes.
vii) Operational amplifier in non-inverting mode cannot amplify negative signals.
viii) IC LM380 is a small signal amplifier used to amplify the voltage.
ix) Largest decimal number represented by a 2-digit hex number is 99.
x) In a CRO sweep generator output is given to the vertical deflection plates.
Electric Circuits
When your car won’t start in really cold weather, it is often because your battery
has failed. A failing battery can sometimes be resuscitated by “jumping” it, as in the
circuit diagram below. Determine the current in the starter and in the failing battery.
With your solution, please re-draw the circuit diagram and label your loops and initial
current direction arrows.
0.1ohms 1.0ohms r=.05ohms starter
12v 10v
good battery bad battery
has failed. A failing battery can sometimes be resuscitated by “jumping” it, as in the
circuit diagram below. Determine the current in the starter and in the failing battery.
With your solution, please re-draw the circuit diagram and label your loops and initial
current direction arrows.
0.1ohms 1.0ohms r=.05ohms starter
12v 10v
good battery bad battery
Electric Circuits
Find the current in each branch of the circuit below (I1, I2, and I3).
18v <--------- I1 5ohm
11ohm 12v 7ohm
I2 ----------->
5ohm ----------> I3 36v
18v <--------- I1 5ohm
11ohm 12v 7ohm
I2 ----------->
5ohm ----------> I3 36v
Electric Circuits
You wired up this circuit in lab and measured the current through the 2-Ω resistor to
be 4 A. Unfortunately, the ammeter then broke before you could measure the current
through the other three resistors. Use Kirchoff’s Rules to determine the current in
each of the other three resistors.
1ohm
2ohm 3ohm
20v 4ohm 9v
be 4 A. Unfortunately, the ammeter then broke before you could measure the current
through the other three resistors. Use Kirchoff’s Rules to determine the current in
each of the other three resistors.
1ohm
2ohm 3ohm
20v 4ohm 9v
Electric Circuits
At the most recent meeting of the physicists-who-look-to-torture-students club, there
was great discouragement at how the students had solved the evil capacitor network
problem. What could be done? A timid voice2
from the back said, “We could try
again with resistors?” Yes... resistors! Mwa-ha-ha-ha! Find the equivalent resistance
of the network pictured here, then find the current and potential difference across each
resistor.
4ohms
7ohms
2ohms
3ohms
2ohms
9volt battery
was great discouragement at how the students had solved the evil capacitor network
problem. What could be done? A timid voice2
from the back said, “We could try
again with resistors?” Yes... resistors! Mwa-ha-ha-ha! Find the equivalent resistance
of the network pictured here, then find the current and potential difference across each
resistor.
4ohms
7ohms
2ohms
3ohms
2ohms
9volt battery
Electric Circuits
Weekend breakfast! I love waffles and bacon, and have to have my coffee. The waffle
iron is rated at 1200 W and my coffee pot draws 700 W of power. Today I will be
making the bacon in the microwave, which is 900 W. If all three appliances are on the
same household circuit (which has ∆V = 120 V), will I be able to make my breakfast
if the circuit breaker trips at 20 A?
iron is rated at 1200 W and my coffee pot draws 700 W of power. Today I will be
making the bacon in the microwave, which is 900 W. If all three appliances are on the
same household circuit (which has ∆V = 120 V), will I be able to make my breakfast
if the circuit breaker trips at 20 A?
Electric Circuits
Five resistors are connected. Two of the resistors are identical
(R), but their resistance is not known. If the equivalent resistance for the full network
is 75 Ω, find the value of the resistance R.
R1
R2
120ohms 40ohms
5ohms
(R), but their resistance is not known. If the equivalent resistance for the full network
is 75 Ω, find the value of the resistance R.
R1
R2
120ohms 40ohms
5ohms
Electric Circuits
We have a ton of 47 Ω resistors in the lab. I need a resistor that is closer to 70 Ω. Come
up with some way to wire multiple 47 Ω resistors (using series and parallel rules) to
produce an equivalent resistance of 70±3 Ω (your equivalent resistance can be anything
between 67 and 73 Ω). You can use as many resistors as you would like.
up with some way to wire multiple 47 Ω resistors (using series and parallel rules) to
produce an equivalent resistance of 70±3 Ω (your equivalent resistance can be anything
between 67 and 73 Ω). You can use as many resistors as you would like.
