Electrical Engineering Answers

Explain transistor current components pnp structure with suitable diagram and relationship.

Write short note on:
LED, Tunnel Diode, Break Down, Need of biasing.

1.

A 400 mH coil of negligible resistance is connected to an AC circuit in which an effective current of 6 mA is flowing. Find out the voltage across the coil if the frequency is 1000 Hz.

2.

A capacitor of capacitance 102/π µF is connected across a 220 V, 50 Hz A.C. mains. Calculate the capacitive reactance, RMS value of current and write down the equations of voltage and current.

3.

Find the impedance of a series RLC circuit if the inductive reactance, capacitive reactance and resistance are 184 Ω, 144 Ω and 30 Ω respectively. Also calculate the phase angle between voltage and current.

1.

A 400 mH coil of negligible resistance is connected to an AC circuit in which an effective current of 6 mA is flowing. Find out the voltage across the coil if the frequency is 1000 Hz.

2.

A capacitor of capacitance 102/π µF is connected across a 220 V, 50 Hz A.C. mains. Calculate the capacitive reactance, RMS value of current and write down the equations of voltage and current.

3.

Find the impedance of a series RLC circuit if the inductive reactance, capacitive reactance and resistance are 184 Ω, 144 Ω and 30 Ω respectively. Also calculate the phase angle between voltage and current.

Explain the principles of KCL and KVL laws used to solve circuit question.Kindly ponder on how the loop and direction ll help in determining the equations(either a positive or negative current)

Consider a text sentence of your choice whose length is not less than 100 characters/symbols. Calculate the frequencies of the symbols and perform the following.

a) Obtain the Huffman code and Shannon-Fano code for each symbol.

b) Obtain the Huffman code and Shannon-Fano code for each symbol via hand calculation, by depicting all the steps to construct the corresponding trees.
c) Compare the codes from a and b and comment.
d) Calculate the total information required to transmit symbol sequence.
e) Calculate the coding efficiency.

1. RS-232, RS4-22 and RS485 are all examples of communications __________.
2. Device Net bus network is used to connect ________ devices to controllers.
3. Control Net is used for communications between __________.
4. What are the initial steps for configuring VTSCADA?
5. A ________ network usually refers to a system that coordinates and monitors processes.
6. Open communications networks:
a) are based on standards developed through industry associations.
b) do not require that you to buy all components from a single supplier.
c) do not use a proprietary protocol.
d) all of these.
7. A PID Controller:
a) is tuned using a signal generator.
b) is factory tuned for optimum performance.
c) must be custom-tuned to each process.
d) both a and b

The data input and data select waveforms are applied to the multiplexer. Determine the output waveforms in relation to the inputs. Also write the Truth table for this multiplexer.

A wire 1000 ft long has a resistance of 0.5 kΩ and an area of 94 CM. Of what material is the wire made (T= 20°C)?

For the following converter, assume LM is in parallel with the primary winding and N1/N2=5.
OUESTION 6
Assuming D=0.6, determine the ratio Vo/Vin

QUESTION 7
In the previous question, determine IL/Io.

QUESTION 8
Determine the RMS value of the following waveform (first do something about the second and 3rd terms).
v(t) = 3 + 10cos(wt) + 5sin(wt) + 4cos(3wt) + 2sin(7wt-30)

QUESTION 9
Consider the following signal:
Starts at the origin. Linearly decreases to -1 by T/6. Remains at -1 until
T/3. Then linearly increases to 1 by 2T/3. Remains at 1 for another T/6, and then
decreases linearly to 0 at T.
T is the period.
Solve for a0

QUESTION 10
For the previous question, solve for a5

QUESTION 11
From Question 9, solve for b5.

QUESTION 12
From Question 9, solve the RMS value of the fundamental component.