Electrical Engineering Answers

If x[n] ↔ X(Ω) are Fourier transform pairs, find the Fourier transform of nx[n].

Find the inverse Fourier transform of X(Ω), which is a rectangular pulse:

X(Ω) = 1, −W₀ < Ω < W₀

0 elsewhere

Prove the Parseval’s relation for discrete-time aperiodic signals:

Comment on the stability and causality of a system h(t) which has a frequency response:

H(ω) = 1, −W₀ < ω < W₀

0, elsewhere

Comment on the stability and causality of a system h[n] which has a frequency response:

H(Ω) = 1, −Ω0 < Ω < Ω0

0, elsewhere

Construct a high pass filter using a low-pass filter having an impulse response:

h[n] =(a^n)(u[n]) 0 < a < 1

1. How does an electric field and magnetic field affect the kinetic energy of a charged particle moving in free space?
2. What is the relationship between magnetic torque and force?
3. Differentiate the magnetic moments: orbital spin moment, electron spin moment, and nuclear spin moment.

Consider a dc machine whose circuit model is drawn below. It is a separately excited

machine as its field coil (winding) is excited from a voltage source independent of the

armature circuit. A 25 kW, 250 V dc machine is separately excited. The field current

is held constant at a speed of 3000 rpm. The open circuit voltage is 250 V. Calculate

the terminal power, electromagnetic power and torque at terminal voltage of 255 V

and 248 V. The armature resistance is 0.05 W. Speed is held constant at 3000 rpm.

Write a Executive summary on (Zenor Diode) with 75-95words only. Also write its at least 2 example with explanations