Use matlab to solve the following:

A field-controlled DC motor can be described by the following differential equation:

ay³(t)+by²(t)+cy¹(t) = dx(t)

Where y(t) is the angle displacement of the motor’s load and x(t) is the applied voltage to the motor. The applied voltage is DC that turns on at t = 0, which is a step function. The values for a,b,c and d are derived from the model of the field controlled DC motor. This is a concept that is slightly advanced from this class. For now, go with this:

% Motor Parameters

J = .01; % Gain (positive)

f = .10; % Friction (0

Rf = 10;

Lf = .01;

kt = 10;

% System coefficients

a = J;

b = f+ J*Rf/Lf;

c = f*Rf/Lf;

d = kt/Lf;

(1) Plot the impulse response and the step response of the system.

(2) Analyze the plots by answering these questions:

(a)If an impulse is applied, how many degrees does the motor turn? And how long does it take to turn those degrees?

(b)After 1 minute of applying a step voltage (1 volt DC), how many revolutions of the motor ? How many revolutions if the DC voltage applied is 12 volts ?

(c)The only parameters we can control in the motor are J, f, and the input voltage x(t). Play with these to evaluate the motor. In other words try a few different sets of values for J, f, and the input voltage x(t) and explain what happens.

What happens if the generator is connected up to the mains asynchronously?

A)  Design 0?379 count?up counter with BCD counter blocks if input clear signal is synchronous.

B) Design 0?379 count?up counter with BCD counter blocks if input clear signal is Asynchronous.

C) Design of 1/577 frequency divider with BCD count?up counters (Clear signal is Asynchronous)

explain the different levels of the PCI compliance (Payment Card Industry Security Standards Council) and what needs to be done for a corporation to satisfy the PCI requirements for the Level 4 (small-to-medium sized business)

Design a digital PID controller based on the Ziegler_Nichols method for for the following system:

G(s)=1/((s+1)^4 )

use the sampling time of T=0.1 seconds and simulate the resulting controlled system by applying a unit

step and then changing the value of input to another value after some appropriate time

Discus the effect of set point change.

Bipolar junction transistor

V-V_BE=B*I_B+D*I_C

what does it mean​ B=? and D=?

S_I=dI_C/dI_CBO=(1+h_fe)*B/(B+D*h_fe) IF B,D=0 S_I=? AND B=D S_I=?

S_V=dI_C/dV_BE=(-h_fe)/(B+D*h_fe) IF B,D=0 S_V=? AND B=D S_V=?

S_H=dI_C/dh_fe=I_CQ*B/(h_fe*(B+D*h_fe)) IF B,D=0 S_h=? B=D S_h=?

Engineering Ethics Course

Rights and Responsibilities of Engineers chapter

1-An engineer leaves a company and goes to work for a competitor. Is it alright for the engineer to use proprietary knowledge gained while working for the previous employer at the new job? Justify your answer.

2. You hold a position on a commission charged with selecting and approving construction contracts for the city. For a specific construction contract, one of the bidding companies employs one your relatives. If you choose to participate in the selection/approval process for this contract, does this represent a conflict of interest? If so, what type of conflict of interest is it?

3. What are the 4 criteria that must be met for whistle-blowing to be attempted?

Example:

A 3-address computer has 40 instructions, 16 Registers, and 256KB memory. Assume each instruction has three operands. Two registers and the third operand is a direct address location of a memory. Find minimum size of PC, MAR, MDR, IR.

Solution:

OPCODE R1, R2, address

OPCODE is 6 bits since 2^6>40

Register field is 4 bits since 2^4 =16

Memory field is 18 bits since 2^18=256K

Instruction length =6+4+4+18=32 bits

MDR=32 bits

IR=32 bits

MAR=18

PC=18

Please explain

What does the following statement tell a C compiler to do, and when does it do it?

#define UCHAR unsigned char

list the losses in the series and parallel DC motors, and to which they are attributed.

What is the difference between a capacitor- start split-phase motor and a permanent-split capacitor motor? Briefly explain some of the differences between them including advantage and disadvantages of each.

A variable attenuator that provides 0-15 dB attenuator 0.5 dB steps.

Analyze and describe an appropriate attenuator architecture

and specify the number of control bits required to control this device

A constant pitch helical coil is made from a length L=7m of round conductor having a copper core with diameter d=0.1mm and covered with an insulation of thickness t=0.02m, by winding the conductor on a mandrel having a length Lm=120mm and a diameter dm=3mm and allowing equal leads for connection at the two ends, each with a length l=10mm

Calculate the coil DC resistance if the electrical resistivity of copper is 1.72 µΩcm [marks 2]

Calculate the coil inductance [marks 4]

Calculate the equivalent capacitance of the coil. The relative permittivity of the conductor insulation is εr = 2.3mm [marks 2]

If the coil is attached to a circuit using its leads estimate the supplementary inductance and capacitance introduced by this set-up. [marks 3]

Calculate the resonance frequency for the arrangement considered in d) [marks 1]

9. The purpose of this problem is to use MATLAB to compute the magnitude, phase, and total
energy of a Fourier transform.
a) Develop a MATLAB routine to plot the magnitude and phase of a given Fourier
transform H(jω). The input part of your program will, of course, require that you
specify the particular H(jω) of interest, but, once this is done, your program should not
depend on the Fourier transform specified. You will need to select an appropriate
range of frequencies for these plots. Test your program using the following three
signals for a = 4 (plot all three using the same range of frequencies):
i) h(t) = e-at u(t)
ii) h(t) = e-a|t|
iii) h(t) = te-at u(t)
b) Extend the MATLAB routine that you developed in part a) to find the approximate
total energy in each of the signals, as well as to find the approximate frequency ω in
rad/sec below which 90% of the total signal energy is contained.
c) Suppose you wanted to design a simple low-pass filter with a specified cutoff
frequency. Assuming that you could choose the desired value of a and based on the
total energy criterion alone, which impulse response would you choose? Why?