Electrical Engineering Answers

In a p-n junction, if the doping concentration on then-side is larger than the doping concentration on the p-side, which side has a larger depletion width? Justify your answer

Water is being heated in a closed pan on top of a range while being stirred by a paddle

wheel. During the process, 30 kJ of heat is transferred to the water, and 5 kJ of heat is lost

to the surrounding air. The paddle-wheel work amounts to 500 N · m. Determine the final

energy of the system if its initial energy is 10 kJ.

Y=1/2(3x^2+1)^2

A cable one mile long and 0.50 inch in diameter is composed of a steel core 0.25 inch in diameter and the

outside shell is aluminum. The resistance of the cable is _____ is Ps and Pa 57.4 and 17.5 ohm Cmil/ft,

respectively

Calculate vo(t) and show the phasor diagram of the currents in the given circuit.

a)     Draw a block diagrams of the following:                                                                                                                                

- a 4-to-1 multiplexer. 

- a 4-to-2 encoder.

How is the 4-to-2 encoder different from a 4-to-1 multiplexer?

A coil is wound with 300 turns over a stee ring of relative permeability 900 having a mean circumference of 400 mm and a cross-sectional area of 500 mm2 . If the coil has a resistance of 8Ω and is connected across a 20V dc supply, using a neat sketch, calculate:

a).The coil magneto-motive force

b).The magnetic field strength

c).The total flux

d).The reluctance of the ring

e).The permeance of the ring and

f).The flux density in the ring

A 162-MHz carrier is deviated by 12 KHz by a 2-KHz modulating signal. What is the modulation index?

An 8-ohm resistor is in series with an inductive coil and the combination is connected

across a 120 V, 60 Hz source. A voltmeter connected across the resistor reads 32 V and 104 when connected across the coil. Determine the resistance of the coil.

The ohmic resistance of a large magnetic contractor is measured to be 20 ohms. A 230 V is

impressed on the contractor and the current is taken as 3.2 A. Neglecting core loss, determine

the inductance of the contractor in mH?