Draw the pin configuration of timer 555 and describe the monostable operation of it.

a) Calculate the electric field of a point P on the perpendicular bisector of a dipole. Also calculate the potential difference from infinity of the point. Also make a sketch of the equipotential lines and the electric field lines. b) Explain what happens if we put a large point charge Q at that point P.

1. three-phase induction motor rated 250 hp, 0.7 pf and 80% efficiency. Determine the minimum size in kVAR of a capacitor needed to prevent overloading the transformers.Two single-phase transformers each rated 150 kVA are connected open delta supplying a

2. A 2.2 kV, 200 hp, delta- connected, 3 phase synchronous motor is operating on full load at an efficiency of 0.88 and pf of 0.8 leading. The armature has a reactance per phase of 5 ohms and negligible resistance. Solve the induced emf per phase.

3.The result of the no load test on a three phase wye connected induction motor are as follows: line to line voltage = 400 V; Input power = 1770 W; Input current = 18.5 A; friction and windage loss = 600 W. determine the magnetizing reactance per phase.

1.Evaluate (1 + a) / (1 + a^2)

2. A generator having a solidly grounded neutral and rated 50 MVA, 30 kV has a positive, negative and zero sequence reactances of 20, 20 and 5 percent respectively. What reactance must be place in the generator neutral to limit the fault current or a bolted single line to ground fault to that for a bolted three phase fault?

3. The positive, negative and zero sequence reactances of a 15 MVA, 11 kV three-phase wyeconnected generator are 11%, 8% and 3% respectively. The neutral of the generator is grounded and is excited to the rated voltage on open circuit. A line to ground fault occurs on phase a of the generator. Calculate the fault current.

Design a 4 to 1 demultiplexer with 2 select inputs B and A, 4 data inputs (D3 to D0), and an output Y. You can use MultiSim with just basic gates (AND, OR, NOT, NAND, NOR, XOR), VHDL, or LabVIEW.

please I will need screenshots for the circuit and successful completion of the simulation. Thanks!

A powerful bipolar permanent magnet stepper motor used for positioning a valve has a rated current of 13 A, a winding resistance of 60 mΩ, a winding inductance of 0.77 mH, a 0.16Nm detent torque, holding torque: 9.5 N.m, torque at 50 steps per second [sps]: 8 N.m. Its step rate is 200 steps per revolution, and the rotor inertia is 0.7x 10- 3 kg.m2.

The motor is chopper-driven at 65 V and it develops a torque of 2.2 N.m at 10000 sps. Calculate:

1. The speed [rpm] and power [hp] of the motor when it is running at 10000 sps.

2. The time constant of the windings

3. The time to reach 13 A when 65 V is applied to the winding

Design a clock display to show the time in hours, minutes, and seconds. Assume that we have a clock of exactly 1 KHz (1000 clock pulses per second). It will use 6 seven-segment displays and operate either in military time (hours 00 to 23) or regular time (1 to 12, with AM and PM). An input line, x, differentiates between the two. A seventh display is used to show A or P in the latter case; it is blank otherwise. Assume that there is a BCD-to-seven-segment decoder driver available; one is needed for each display other than the AM /PM one.

Consider a thin flat rectangular region that of size 4 x 2 m2 and it is electrically insulated at its four corners. (A)Solve Laplace’s equation  2 V(x,y) = 0 in the rectangular region 0 < x < 4 m and 0 < y < 2 m using the separation of variable technique subject to the following boundary conditions:
V(0,y) = 0
V(4,y) = q(y) = 50 sin (3π y / 2)
V(x,0) = 0
V(x,2) = f(x) =100 sin (π x / 4)
(B) Use the result of part (A) to find the corresponding electric field inside the region.

A three-phase positive sequence Y-connected source supplies 12 kVA with a power factor of 0.75 lagging to a parallel combination of a Y-connected load and a Δ-connected load. The Y-connected load uses 6 kVA at a power factor of 0.6 lagging and has an a-phase current of 12∠−30∘A

Part A: Find the complex power per phase of the  Δ-connected load. (VA)

Part B: Find the magnitude of the voltage. (Volts)

Does inserting the dielectric increase or decrease the amount of charge the battery is able to push onto the capacitor plates? Explain why the dielectric has this effect.

a) determine the critical distance for the two-ray model in an urban microcell (ht=10m, hr=3m) and an indoor microcell (ht=3m, hr=2m) for fc=2GHz. What are the practical implications of your obtained values
b) Consider an indoor wireless LAN with fc=900MHz, cells of radius 100m, and none-directional antennas. Under the free-space path lost model, what transmit power is required at the access point such that all terminals within the cell receive a minimum power of 10uW. How does this change if the system frequency is 5GHz.
c) The transmission power of a wireless system is 40W, under a free-space propagation model. 1) what is the transmission power in unit of dBm 2) The receiver is in a distance of 1000m, what is the receiver power, assuming that the carrier frequency fc=900MHz and Gt=Gr=0dB 3) Express the free space path lost in dB

Design and simulate a first order high pass filter so that it has a cutoff frequency of 2 kHz and a passband gain of 1.

please use online multisim

10. A transmission line operating at 500Mrad/s has L=0.5µH/m, C=32pF/m, G=100μmho/m and R=25Ω/m. (a) Calculate values for γ, α, β, v, λand Z₀. (b) What distance down the line can a voltage wave travel before it is reduced to 10 percent of its initial amplitude? (c) What distance must it travel to undergo a 90^o phase shift?

A three-phase, 11.2-kW, 1750-rpm, 460-V, 60-Hz, four-pole, Y-connected induction motor has the following parameters: Rs = 0.53 Ω, R’r = 0.38 Ω, Xs = 1.23 Ω, X’r = 1.45 Ω, and Xm = 25.2 Ω. The motor is controlled by varying both the voltage and frequency. The volts/hertz ratio, which corresponds to the rated voltage and rated frequency, is maintained constant.

a) Calculate the maximum torque, Tm and the corresponding speed, ꞷm for 60 Hz and 30 Hz.

b) Repeat (a) when Rs is negligible.

c) Draw a graph of torque–speed characteristics with volts/hertz control with the range of β between 0.4 and 1.