1. With regards to electrical noise and inductive coupling, explain the purpose of running current carrying conductors in their own raceway separate from signaling cables.  Does the type of raceway material, ferrous vs non-ferrous make difference?

3. List two materials commonly used in TVSS (Transient Voltage Surge Suppressors).  As well,

UL 1449 uses 3 categories when rating Surge Protective Devices (SPD) / Transient Voltage Surge Suppressors (TVSS).  List the categories and explain how they apply to a TVSS’s performance.

A brief theory (3 paragraphs minimum) about Transmission Lines.

Describe briefly how the laser is modulated? Using the simple rate equation for carrier and photon density, explain why the high-speed small-signal response will behavior like L-C circuit? Why the bandwidth (resonant frequency) increases as the current increases?

(e) In the steady state and above threshold, why will the gain and carrier density inside a semiconductor laser be clamped (limited)to the threshold condition? How about photon density inside the cavity? If the driving current is time varying form, are gain and carrier density still kept in constant values? How about in AC driving conditions?

A physical voltage m(t) between a pair of wires modulates a carrier c(t) for transmission as s(t). The system is DSB-PC AM. Part of the message’s spectrum is M(f) = 0.6*exp(j*20)*delta(f-96) + 0.4*exp(j*45)*delta(f-104)+...

But this is not the whole spectrum, for if it were the whole spectrum, then m(t) would be complex, whereas physical voltages cannot be complex

given:

a) Write the whole spectrum M(f). Also, plot |M(f)| and arg M(f).

b) Suppose that the carrier frequency is fc = 800 and that the deviation constant is k = 0.4. Plot |S(f)| and arg S(f). Show your supporting work.

c) your solution included both sidebands of S(f). However, are both sidebands of S(f) really required?

d) why can S(f) omit a sideband even though M(f) cannot? [Hint: like m(t), s(t) too is constrained to be real valued. Explain however why omitting a sideband does not make s(t) complex.]

i) What is the general expression for the electrical resistivity of a metallic material with eutectic composition such as the Pb-Sn solder material? Identify all the parameters in the expression.

ii) Based on your knowledge of single phased and multi-phased materials, explain how you can make material choice for a device based on resistive heating such as stove heating coils. Indicate how the enhancements of the heating efficiency can be achieved in single phased and multi-phased materials.

Write down the overall general expression for the conductivity of a material taking into consideration the different types of charge carriers. Identify all the parameters in the expression:

Use the overall expression for conductivity to state the conductivity of Cr₂O₃–Li₂O-NiO composite material taking into consideration all the charge carriers associated with it.

Write down the overall general expression for the conductivity of a material taking into consideration the different types of charge carriers. Identify all the parameters in the expression:

Use the overall expression for conductivity to state the conductivity of Cr₂O₃–Li₂O-NiO composite material taking into consideration all the charge carriers associated with it.

How do you prove that: (a) holes really exist, (b) holes have a positive charge, (c) Holes have an effective mass?

Zinc, a divalent metal, was measured to have a positive Hall coefficient. Explain the reason (theory) behind this fact.

PART 1: Design a program (using only native MIPS instructions, no pseudo instructions) that will prompt user to enter three decimal numbers. Each decimal number will not exceed six digits The program can't ask user how many digits will be entered. Both numbers must be stored in memory as NULL terminated strings. The first number must be stored at the memory address 0x10000000. The second number must be stored in the memory 0x10000008. The third number must be stored at the memory 0x10000010. The user may enter a comma(e.g 123,456) when entering the numbers, but not required. If a comma is entered, it should not be stored as part of the string.

PART 2: write a MIPS assemlby language subroutine called sum that accepts arguments in $a0 and $a1. The arguments are the address of the two NULL terminated strings. The subroutine should convert each of the two strings to intgers, and return the sun in $v0. Note that the strings must NOT be modified by the routine! Your subroutine must adhere to the MIPS software conventions.

THE TWO PARTS MUST BE SEPERATED BY:

#_CUT_HERE

10) A continuous-time system is described by the following relation, y(t) = (cos 3t) x (t) where y(t) is the output of the system and x(t) is the input to the system. D

etermine by sufficient explanation whether the system is: a) Stable, b) Memoryless, c) Causal, d) Time invariant, e) Linear.

competence management systems and documentation used in signalling
describe the role of the institute of rail signal engineering

Write the Verilog code and test bench for the following circuits:

- Mealy State machine design for a Serial Adder Circuit

- Moore State Machine design for a Serial Adder Circuit