Name: _____________________________
Introduction to Engineering
1st Semester, Exam 4
SHOW CALCULATIONS AND UNITS FOR ALL ANSWERS
Problem 1a: The voltage source for the circuit shown below is 12 V: (15 Points)
a. If all three resistors were to be replaced with one single equivalent resistor,
what would be its resistance value?
b. What would be the current flow, i, in this circuit?
c. Which of the following resistors, R1, R2, or R3, would have the largest voltage
change across it?
Given:
V = 12 Volts
R1 = 4 
R2 = 8 
R3 = 12 
a. Req =____________________
b. i  _____________________
c. R3  ____________________
Problem 1b: Assume for the circuit shown that the R’s are the light bulbs and that you
have been able to measure and determine the following values: (19 points)
Source Voltage
V = 120 Volts
Source Current
ix = 12 Amps
i1 = 6 A
i3 = 4 A
R3 = 30 
Calculate the missing parameters of:
a. R1  __________________
b. R2  __________________
c. i2  ___________________
Calculate the equivalent resistance, Req, for all three resistors combined
Req  ________________
If R1 (first bulb) is removed or turned off, what would be the new ix?
i x  _________________
Name: _____________________________
Problem 2: While on vacation, you see a giant sequoia (tree) and wonder how high it is.
You have your max flash camera with you and, from your lab experiments, you know the
focal length of this camera is about 30 mm. You pace off the distance from the place you
took the picture to the base of the sequoia and find it to be 120 meters. When you get the
prints back you measure the image of the giant sequoia on the negative and find it to be
20 mm high. Given this information, how tall is the sequoia? (10 points)
Problem 3: In the camera, the flash capacitor can still be dangerous even with the
batteries removed. Why is this? (6 points)
Problem 4: Two common assembly methods are fixed material location and sequential
assembly. Briefly describe each method. Discuss one common problem with the
sequential assembly line method and briefly describe how you would attempt to solve it.
(9points)
Name: _____________________________
Problem 5: The following waveform was measured on an oscilloscope similar to the
ones that you used in lab. What is the voltage at 9 milliseconds? What is the frequency
and period of the waveform? (6 points)
NOTE: The reference voltage (zero voltage) is indicated by the arrow with the
ground symbol in the middle of the display.
Name: _____________________________
Problem 6: Using CADKEY create an isometric (3-D) drawing of the object whose
multi-view drawing is shown below. PRINT THE (3-D) DRAWING. DO NOT LEAVE
YOUR SEAT. THE INSTRUCTOR WILL COLLECT THE DRAWING FROM THE
PRINTER. Make sure your name appears on the drawing! Use print preview to see
the drawing you are sending to the printer. (35 Points)
1 grid space = 0.5 inches