What is the use of open drain on a GPIO output pin?

Rexlex klystron (step-by-step)

a-) Explain the process of grouping electrons in a reflector klystron.

b-) Explain the mechanism of electronic frequency tuning in reflective klystron.

c-) What does the mean balance of phase in reflex klystron?

d-) Why the maximal efficiency of reflex klystron corresponds to X=2.4? How we can prove it?

draw, for values of x between -2 and +2, f(x) = x², f(x) = 2x² and f(x) = 3x²

However, in June 2020, several customers have voiced out their dissatisfaction about their recent electricity bill spikes on social media. In this assignment, you are required to conduct your own research by identifying what are the causes/issues of the dissatisfaction.

Determine the magnitude of polarization (in C/m2) in a material if it is stressed 4.72 GPa perpendicular to the poling axis. (Answer format X.XXX)

d3,1 = 187 x 10-12 m/V

d3,3 = 219 x 10-12 m/V

(2) Let Vabc = [ - 5 , 5 + 5 j , - 5 j ] T and calculate Vb012. Draw a phasor diagram illustrating the relationship Vb = Vb0 + Vb1 + Vb2 .

Generate and plot sinusoids of frequencies 300 Hz, 500 Hz and 1200 Hz. Plot each of them and their sum using the “subplot” command in one figure. Indicate the axes’ titles.

Q3)
A three-phase, Y-connected, 220 V, 13 kW, 60 Hz, six-pole induction motor has the following
parameter values in Ω/phase referred to the stator:
R1 = 0.3 Ω. R2' = 0.15 Ω
X1 = 0.5 Ω. X2'= 0.21 Ω Xm = 13.25 Ω
The total rotational losses are 450 W. The core loss is lumped in with the rotational losses. For a slip of 0.02,
and based on approximate equivalent circuit, determine:
(i) The rotor speed.
(ii) The stator current.
(iii) The power factor of the motor.
(iv) The input power of the motor.
(v) The developed mechanical power.
(vi) The efficiency of the motor.

please say why you have chosen this answer in details also please clear hand writing thanks in advance

(v) When doping a semiconductor p type, the bulk of the material has:

      A positive charge

       A negative charge

       Is neutral

        Will only get a positive charge when we apply a voltage

Explain why you chose this answer:      

(vi) In order to generate free charge carriers by optical excitation, the wavelength of the incident light needs to be:   

      Monochromatic (single wavelength)

       Longer than the cut-off wavelength of the material

       Shorter than the cut-off wavelength of the material

        Of a very high intensity to penetrate the material

Explain why you chose this answer:

(vii) Light of the correct wavelength to produce optical excitation is incident on a piece a p-type Si. This will produce:

      A greater number of holes than electrons

       A greater number of electrons than holes

       A greater change in the number of holes relative to the number before illumination

        A greater change in the number of electrons relative to the number before illumination.  

Explain why you chose this answer:

(viii) Compared to silicon, compound semiconductors such as GaAs will always:

      Have a direct bandgap

       Be more expensive to produce

       Be easier to dope  

       Allow us to easily vary the bandgap.   

Explain why you chose this answer:

Please write and solve one question about identical transformer (parametric). Also, please write and solve one more question about real transformer (numerical). You can get help from the Electric Machinery. A.E. Fitzgerald book. (Add approximations if any) I'm waiting for two questions with answers to learn transformers in detail.

Consider an ideal down converter supplying load resistance of 80 ohms from a voltage source rated 9V and 250mA. The converter operates at 70-kHz and is designed for 5% voltage ripple and 10% current ripple with a duty time of 60%.

a) Calculate the output voltage, output voltage ripple, output current and output current ripple.

b) Calculate the cycle period, T on and T off.

c) Calculate the required inductance and capacitance values

d) Calculate the output voltage as functions of time

e) Graph the ideal output voltage and inductor current waveforms.

Create a comparative table of advantages and disadvantages of active, passive and digital filters.