A Si pn junction has a circular cross section with a diameter of
10 μm. This junction
has Na = 1018 cm-3 on one side and Nd = 5 x 1015 cm-3 on the other.
Calculate Xn, Xp,
Q+ (total charge on n side), and E for this junction at equilibrium
(300 K). Sketch E(x)
and charge density to scale.
In: Electrical Engineering
Describe the advantages of pulse width modulation (PWM) switching for the inverter control. Then state 3 types of PWM switching scheme available.
In: Electrical Engineering
Please give brief descriptions and examples with
diagrams on
TXCVR
TYPES OF COMMON FILTERS
BER VS POWER RELATIONSHIPS IN DB SCALE
In: Electrical Engineering
A sinusoidal voltage is given by v(t)=7 cos(172t+28o) V. What is the first time in ms for t>0 for which v(t) has a zero crossing?
In: Electrical Engineering
Solve the following system :
w ′ + y = sin x
y ′ − z = ex
z ′ + w + y = 1;
w(0) = 0, y(0) = 1, z(0) = 1
In: Electrical Engineering
Can BJT or phototransistor be used as a sensor? Explain it with a circuit diagram. How are you going to make it in reversed logic? What about photoresistors? Can it be used as a sensor?
In: Electrical Engineering
A 1mc charge is separated from a 3mc charge by 10m. If the P denotes the point of Zero electric field between the charges, determine the distance x, from the 1mc chrage?
a) 3.71m
b) 3.66m
c)3.12m
d)4.36m
In: Electrical Engineering
Explain using your own figure, the application of Ayrton shunt in an ammeter circuit reflects to the sensitivity of a meter movement
In: Electrical Engineering
9.8.2 Generation of DTMF Tone
Using firpm function of MATLAB, design a lowpass and a highpass
filter to filter
out highpass and lowpass components of DTMF tones, respectively. Do
not use very
high-order FIR filters.
1. Generate the signal for DTMF tone ’2’
2. Plot a couple of periods of the signal you generated
3. Plot the spectrum of the signal you generated, comment on the
spectrum
In: Electrical Engineering
9.8.3 Lowpass and Highpass Filters
Using firpm function of MATLAB, design a lowpass and a highpass
filter to filter
out highpass and lowpass components of DTMF tones, respectively. Do
not use very
high-order FIR filters.
1. Lowpass filter:
a. Filter out the highpass component of the signal you generated
through the
lowpass filter designed by firpm. Note: You should use convolution
not FFT
b. Plot a couple of periods of the output signal
c. Plot the spectrum of the output signal, comment on the
spectrum
2. Highpass filter: Repeat (a,b,c) for the highpass filter
In: Electrical Engineering
Sketch the closed loop frequency response M(jw) as a function of frequency for a unity feedback system with G(s)=10/s(s+2).
In: Electrical Engineering
As a Field service team leader, What do you understand
by the following:
1. Local access network
2.PABX equipment
3.Broadband
4.Access network field engineering
5.Voice over IP and PABX installation
6.CCNA
7.Rectifiers
8.Chiller Plants
9.UPS
In: Electrical Engineering
THESE QUESTIONS ARE FROM THE SUBJECT ELECTRICAL MACHINES
1) DEFINE WARD-LEONARD SYSTEM AND HOW IT CONTROL THE SPEED OF MOTOR ,GIVE ITS ADVANTADGES AND DISADVANTADGES ??
2) WHAT IS RHEOSTAT SPEED CONTROL AND HOW IT CONTROL THE SPEED OF MOTOR , GIVE ITS ADVANTADGES AND DISADVANTADGES ??
3) WHAT IS FIELD SPEED CONTROL AND HOW IT CONTROL THE SPEED OF MOTOR , GIVE ITS ADVANTADGES AND DISADVANTADGES ?????
In: Electrical Engineering
Implement 4-bit binary adder/subtractor using gate level. ( verilog code and test bench)
In: Electrical Engineering
Explain various control methods for the stepper motor: Full-Step Single-Phase, Full- Step Two-Phase, and Half-Step current excitation sequences.
In: Electrical Engineering