Category Archives: ECET 402

ECET 402 Week 1 iLab updated

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ECET 402 Week 1 iLab updated

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.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 iLab updated

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ECET 402 Week 2 iLab updated

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:

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 updated

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ECET 402 Week 3 Homework updated

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?

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 updated

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ECET 402 Week 3 iLab updated

Part A – Voltage to Frequency Converter

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 updated

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ECET 402 Week 4 Homework updated

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 updated

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ECET 402 Week 4 iLab Relays and Relay Logic Controls updated

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ECET 402 Week 5 Homework updated

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ECET 402 Week 5 Homework updated

Chapter 12:

1. Draw a relay wiring diagram for a circuit that implements the simple logic diagram shown in Figure 12.36. The circuit should be in the style of Figure 12.1(a).

2. Repeat Exercise 1 except draw the circuit as a ladder diagram.

3. A small house has three windows and two doors. Each window and door has a switch attached such that the contacts close when a door or window opens. Draw a ladder logic diagram that will turn on a light if one or more windows are open or if both doors are open.

4. In a processing plant, jars on a conveyer belt are cleaned out with a high-pressure air jet just prior to being filled (Figure 12.37). When a jar approaches the cleaning station, it activates a switch (with both NO and NC contacts). The conveyer belt stops for 10 s while the air jet is on; then the conveyer belt starts, and the jar moves along. Draw a ladder logic diagram to control this process.

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ECET 402 Week 5 iLab Stepper Motor and Measuring Speed of a DC Motor updated

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ECET 402 Week 5 iLab Stepper Motor and Measuring Speed of a DC Motor updated

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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