ECET 402 HW Week 1 Pages: 20-21: #2,4,6,11,14 CH 3pgs:103 #4,6

1. ECET 402 Week 1 Homework
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ECET 402 HW Week 1
Pages: 20-21: #2,4,6,11,14
CH 3pgs:103 #4,6
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ECET 402 Week 1 iLab
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1.From Part A, step 1(b) of lab instructions, change the temperature
from 0 to 30° C and record the corresponding RTD resistance in Table 1.

2. 2.Graph the temperature-resistance characteristics of RTD below:
3.Is the graph obtained in step 2 above linear (a straight line)?
4.Use the graph obtained in step 2 above to determine the resistance of
RTD at 75° F.
5.What is the value of resistor R1 found in Part A, step 3(f)?
6.Paste your Multisim circuit from Part A, step 4 below:
7.Briefly describe how the circuit above works:
8. From Part A, step 6 of lab instructions, how would you modify the
circuit so that the LED indicating an air-conditioning system is turned
ON for temperatures of 68° F or higher?
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ECET 402 Week 2 Homework
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Chapter 3
Page 104-105 Problems 24, 25, 28, 30, and 38

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ECET 402 Week 2 iLab
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1.After completing Part A of week 2 lab, complete the following table:
2.Briefly describe if you had any issues with this lab.
3.Briefly describe how you would display the temperature on the LCD
display of a microcontroller system.
4.From Part B, step 1 of lab instructions, paste your Multisim circuit
design below.
5.From Part B, step 2 of lab instructions, paste your Multisim circuit
design below.
6.Enter IL and VL values you found in the circuit of Figure 5 of lab
instructions below:
7.Enter IL and VL values you found in the circuit of Figure 6 of lab
instructions below:

4. 8.Describe the advantages of the voltage follower circuit in Figure 6 of
the lab instructions:
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ECET 402 Week 3 Homework
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Homework
1. What is the difference between static,sliding, and viscous friction?
2. An aluminum casting that weighs 10 lb is resting on a steel surface.
6.A robot arm must be able to extend 24 in. horizontally in 2 s while
carrying a load of 10 lb. How much force is required, assuming the arm
is accelerating all the way?
14.A torque of 18 N · m is applied to a rotating part. The part has a
moment of inertia of 0.078 kg · m2. How much time will it take to rotate
the part 180°?
19.An electric heater is rated at 220 Vac at 15 A. How many Btu/h of
heat does it put out?

5. 22.A small gasoline engine can put out 18,000 N · m/min of mechanical
power. The engine is used to drive an electric generator that is 80%
efficient. Find the output of the generator in watts.
28.What is diametral pitch, and why is it an important parameter in a
gear mesh?
31.For each gear pass shown in Figure 5.49, how many degrees must the
big gear turn for the small gear to make two complete revolutions?
33.Find the overall gear ratio of the gear train shown in Figure 5.50. If
the motor is rotating at 500 rpm, what is the rotational velocity of the
output gear?
46.What are some advantages of transmitting power by belts?
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ECET 402 Week 3 iLab
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Part A – Voltage to Frequency Converter

6. 1.Change input voltage from 2–10 volts and record measured frequency
in Table 1
2. Use the data obtained in Table 1 to graph Frequency vs. Voltage in
Figure 1.
3.Is the output frequency vs. voltage graph linear?
4.Research and describe some applications for Voltage to Frequency
Converter circuits.
Part B – The Security Alarm System
1.Verify the functionality of your circuit. Take a digital photo of your
alarm system and attach below.
2.Write a brief report on the functionality of the alarm system, any
issues you encountered, and any other comments you would like to add.
3.What is the purpose of JK flip-flop in the circuit?
4.What is the purpose of the transistor in the circuit?
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ECET 402 Week 4 Homework
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7. Week 4 Homework
Chapter 11: pp. 483–488,Problems 1, 2, 6, 8, 12, 13, and 19
1.Assume that Figure 11.25(a) is the response curve of a control system
to a step function. Determine the following parameters: rise time,
overshoot, and settling time.
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ECET 402 Week 4 iLab Relays and Relay Logic
Controls
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ECET 402 Week 4 iLab Relays and Relay Logic Controls
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8. ECET 402 Week 5 iLab Stepper Motor and
Measuring Speed of a DC Motor
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Part A
Take a digital photo of your stepper motor circuit and paste it below:
Once the assembly of stepper motor circuit is completed and power is
applied, observe the direction of rotation and record it here:
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ECET 402 Week 6 Homework
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9. P.405, #1Give an example of an open-loop control system. Explain why
the system is open-loop, and identify the controller and final control
element.
P.405, #2Give an example of a closed-loop control system. Explain why
the system is closed-loop, and identify the sensor, controller, and final
control element.
P.405, #7Describe the advantages of a 4- to 20-mA current loop as an
input signal compared to a 0-to 5-V input signal.
P.435, #2Complete a report on one type of open communications
network. Make use of the Internet as well as manufacturer's literature for
compiling the report.
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ECET 402 Week 6 iLab
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1. Determine the overall transfer function of the system given below by
hand as discussed in pre-lab. Please show your work and type the
equations if you can

10. 2. Determine the overall transfer function of the system shown above
using MATLAB. Copy the MATLAB code and the overall transfer
function obtained and paste them below:
3. Are the results in steps 1 and 2 the same? Comment if they are not.
4.Determine the unit step response of the overall system using the
MATLAB command described in the pre-lab. Copy the unit step
response and paste it below.
5. Determine the impulse response of the overall system using the
MATLAB command described in the pre-lab. Copy the impulse
response and paste it below
6. Is the overall system stable?
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ECET 402 Week 7 iLab Root Locus Plots and
the Stability of a Control System
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11. ECET 402 Week 7 iLab Root Locus Plots and the Stability of a Control
System
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