Final Exam, Multiple Choice, Scantron 882-E
EE 1105 Introduction to EE, Freshman Seminar, Fall 2014
Instructor: Dan Popa, Ph.D.
Your Name (Print Clearly)
Instructions:
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Exam time: 2:00 pm – 4:30 am (150 mins).
You are required to work alone, meaning that no discussion amongst yourselves is allowed.
There are fifty questions, each requiring appropriate selection on the Scantron form.
In order to receive full credit, you must clearly mark all the correct answers (mark all that apply).
Most questions will have only 1 correct answer, but some, require multiple selections.
Use of cell phones or scientific calculators during this exam is not allowed.
Time management: while it is up to you to manage your time during the exam, you may
consider moving on to the next problem after 3 minutes so that you can finish the exam.
1. Consider the circuit below, representing a common simple two-port system. What name best describes this
overall system and its time constant?
A)
B)
C)
D)
E)
A low pass filter with time constant T=R/C
A high pass filter with time constant T=RC
A low pass filter with time constant T=RC
A high pass filter with time constant T=R/C
None of the above
2. Consider the op-amp circuit below. What name and Gain (G) best describes this circuit?
A)
B)
C)
D)
E)
A non-inverting amplifier with G=R1/R2
An inverting amplifier with G=-R2/R1
A non-inverting amplifier with G=(R1+R2)/R2
A non-inverting amplifier with G=(R1+R2)/R1
None of the above
3. A voltage divider is designed with two 50 ohm resistors. The input voltage is 10V. When choosing specific parts
to construct this, what should the power rating be for each resistor?
A)
B)
C)
D)
E)
1 Watt
1 Volt-Ampere
0.5 Watts
0.25 Volt-Amperes
None of the above
4. You are designing a microcontroller-based system for the measurement of forces 0 to 100N to the nearest
0.1N. It has been determined that the microcontroller will have an ADC converter with a 0-2.5V input range, and
that the force sensor has a sensitivity of 0.01V. What should be the best gain of the amplifier placed between the
sensor and the ADC, and what is the minimum number of bits that the ADC must have to meet the stated needs?
A)
B)
C)
D)
E)
A Gain of 1 and 12 bits
A gain of 1 and 10 bits
A gain of 0.25 and 10 bits
A gain of 4 and 10 bits
A gain of 4 and 12 bits
5. An inductor is (mark all that apply):
A)
B)
C)
D)
E)
Something that has an inertial effect on current flow
Something that has an inertial effect on voltage rise/fall
Something that stores energy in a magnetic field
Something that stores energy in an electric field
None of the above
6. A capacitor is (mark all that apply):
A)
B)
C)
D)
E)
Something that has an inertial effect on current flow
Something that has an inertial effect on voltage rise/fall
Something that stores energy in a magnetic field
Something that stores energy in an electric field
None of the above
7. A resistor is equivalent to:
A)
B)
C)
D)
E)
A mass
A spring
A damper
Friction
None of the above
8. When troubleshooting current, an amp-meter is placed:
A) In series with the element under test
B) In parallel with the element under test
C) In both configurations
9. When troubleshooting voltage, a volt-meter is placed:
A) In series with the element under test
B) In parallel with the element under test
C) In both configurations
10. A BJT is:
A)
B)
C)
D)
E)
A hamburger for electrical engineers
A current controlled device
A voltage controlled device
Requires at least 5V between the base and emitter to turn on
None of the above
11. The symbol below represents a
A)
B)
C)
D)
E)
A pnp transistor
A npn transistor
A diode
A FET transistor
None of the above
12. Assuming that the lossless system below has an initial charge on the capacitor, we wish to draw what the
voltage and current response would look like on a XY graph. This graph will look like:
A)
B)
C)
D)
E)
A circle
A sine
A cosine
An ellipse
None of the above
13.
Let's say you want to use a LED in a 5V circuit in series with a resistor. Assuming the LED drops 0.7V when
it is conducting and draws 5 mA. What specifications should you give the person buying the resistor for you?
A.
B.
C.
D.
E.
Buy any resistor
Buy a 860 Ohm, 20 W resistor
Buy a 860 Ohms, 100 mW resistor
Buy a 1K, 1W resistor
Buy a 1K, 100 mW resistor
14. A semiconductor is:
A.
B.
C.
D.
E.
An electronic material that is neither conductive, nor insulating
An electronic material that is conductive, but has high resistance
An electronic material that is made of Silicon
A transistor
All of the above
15. A diode is (mark all that apply)
A.
B.
C.
D.
E.
A semiconductor device formed by any two p-n junctions
A nonlinear circuit element
A current controlled device
A device that can only works when the voltages applied are less than 0.7 V
Something that only allows current to flow one way
16. Consider a flashlight that has two AA batteries. What parameters need to be known in order to estimate
how long the flashlight can produce light continuously?
A.
B.
C.
D.
E.
The resistance of the bulb and the electrical energy stored in the batteries
The power rating of the bulb and the battery
The current rating of the bulb and the electrical energy stored in the batteries
The voltage rating of the bulb and the power of the battery
The time the ON switch of the flashlight is pressed
17. The 3 intellectual themes of Electrical Engineering are:
A.
B.
C.
D.
E.
18.
Which EE system could best be described as linear?
A.
B.
C.
D.
E.
19.
A resistive circuit
A transistor circuit
A digital circuit
A mechatronic system
None of the above
Pick the best example of system that employs black box models for its operation:
A.
B.
C.
D.
E.
20.
Hardware, Software, Experimentation
Modularity, Abstraction, Modeling
Sensing, Processing, Actuation
Analysis, Experimentation, Synthesis
Math, Physics, and Electricity
Lawn Mower driven by a human operator
Pressure sensor with bridge circuit and microcontroller
Armature controlled DC motor
Circuit with resistor series connection
All of the above
The role of feedback control is to:
A. Provide a systematic way to predict the system response, and offer analysis and design based on desired
characteristics.
B. Reduce sensitivity to system parameters, reject disturbances, track desired inputs with reduced steadystare errors, overshoot, rise time, settling time.
C. Reduce the estimation errors from sensors, and minimize the energy consumed by the actuators of a
robot.
21.
A current divider consists of two resistors with values of R1=1KΩ and R2=2KΩ, respectively. If the current
flowing through R1 is I1=1A, then the current flowing through R2 will be:
A.
B.
C.
D.
E.
2A
2V
0.5 A
1A
1V
22.
A voltage divider consists of two resistors with values of R1=1KΩ and R2=2KΩ, respectively. If the current
flowing through R1 is I1=1mA, then the voltage across R2 will be:
A.
B.
C.
D.
E.
23.
2A
2V
0.5 A
0.5 V
1V
A mesh in a circuit is defined as:
A.
B.
C.
D.
E.
A closed path with the same start and end node
A loop containing one or more branches not contained in any other loop
A loop that encloses no other loop
A continuous set of branches with no node encountered more than once
None of the above
24. The direction of electric current in a wire is:
A.
B.
C.
D.
In the same direction of electron flow
In the opposite direction of electron flow
Dependent on the movement of both electrons and protons
From positive voltage to negative voltage across the wire
25. A circuit open is defined as:
A.
B.
C.
D.
A switch in the OFF position
Zero resistance between two nodes
Infinite resistance between two nodes
None of the above
26. Silver has a conductivity σ=61.7 MS/m. The resistance of a conductor made of silver with a cross sectional area
2
A=1 mm and a length of 100m is:
A.
B.
C.
D.
E.
1.62 Ohm
1.62 K
6.17 Ohm
6.17 K
I don’t remember the formula for this
27. Kirchoff’s Voltage Law KVL is a statement of conservation of
A. Charge
B. Energy
C. Voltage
28. What conditions must be satisfied for two circuits to be equivalent between nodes 1 and 2
A.
B.
C.
D.
They must have the same topology between the nodes
They must have the same power between the nodes
They must have the same voltage and current across the nodes
All of the above
29. Two circuits with identical Thevenin equivalents (Vth, Rth) are connected to each other. The resulting circuit
has the following equivalent:
A.
B.
C.
D.
E.
Vth, Rth
Vth, 2Rth
Vth, Rth/2
2Vth, 2Rth
2Vth, Rth
30. The circuit diagram in the figure below (Exercise 2-9) has an equivalent resistance equal to:
A.
B.
C.
D.
E.
15 Ohms
0 Ohms
30 Ohms
3.33 Ohms
None of the above
31. Determine the current I flowing through the circuit below (Exercise 3-1)
A.
B.
C.
D.
E.
0.2 A
5A
0.5 A
None of the above
I don’t understand how to do this
32. Explain why the linearity property of electric circuits is an underlying requirement for the application of source
superposition method.
A. The two are the same concept
B. It can be shown that a nonlinear circuit with source superposition property leads to a contradiction
C. There must be another explanation
33. Pick one of the statements that best describes semiconductor fabrication processes:
A. Repeated Implantation, Deposition and Etching
B. Lithography, Irradiation, Bonding, Dicing
C. Dispensing, Spinning, Baking, Developing
34. A circuit will transfer maximum power to a resistive circuit when:
A.
B.
C.
D.
The load will consume a fourth of generated power.
The Thevenin equivalent resistances of the two circuits are equal.
The Norton equivalent resistances of the two circuits are zero.
One of the circuit ports is connected to ground.
35. After converting the decimal number 12 to base 2, the result is:
A.
B.
C.
D.
E.
1001
1010
1100
1110
111
36. If the current through a resistor decays exponentially with a time constant τ, what is the value of the power
dissipated by the resistor at time t=τ?
A.
B.
C.
D.
E.
50%
100%
63%
10%
None of the above
37. If two identical capacitors are connected in series, the equivalent capacitance:
A.
B.
C.
D.
Stays the same
Doubles
Halves
It depends on the capacitor type
38. A band pass filter is a circuit that:
A.
B.
C.
D.
E.
Attenuates high frequency inputs and amplifies low frequency inputs
Attenuates both low and high frequency inputs
Does not attenuate low and high frequency inputs
Amplifies input signals in a narrow band
None of the above
39. Two identical inductors are connected in series. What do you expect of the power dissipated by the overall
circuit when compares to individual inductors:
A.
B.
C.
D.
It halves
It stays the same
It doubles
It changes, but in a different way
40. An operational amplifier is used in negative feedback mode, by connecting the output to its non-inverting input
with a piece of wire. The function of this circuit can be described as:
A.
B.
C.
D.
E.
A comparator
A voltage follower
An amplifier
An attenuator
All of the above
41. In course number EE 3417 of the EE curriculum at UT Arlington you will study:
A.
B.
C.
D.
E.
Continuous Signals and Systems
Electromagnetics
Discrete Signals and Systems
Control Systems
Do I have to remember this??
42. Optics and Photonics is a field of EE that is based on electromagnetic theory as derived from Maxwell’s
equations. The most important applications of this field, in terms of impact to our economy and society are:
A.
B.
C.
D.
E.
Fiber optics, Telecommunications, Light Sources
RFID, Sensors, Solar Cells
Fiber optics, Radio and TV, Biosensors
Holography, Lasers, Microscopy
Astronomy, Space technology, Solar Cells
43. How does the value of wavelength of an optical signal in the visible spectrum compare to the wavelengths the
UV part of the spectrum:
A.
B.
C.
D.
E.
It is slightly higher
It is slightly smaller
It is considerably smaller
It is considerably higher
It is the same
44. Radar is used to detect the distance between an EM source and an incoming object via time-of-flight of the
8
waves, which is approximately 3x10 m/s. If the time delay registered between an emitted pulse and received
pulse is t=1µs, what is the expected distance to the target?
A.
B.
C.
D.
E.
1 km
1m
150 m
750 m
None of the above
45. When writing the equations of motion of an armature controlled DC motor, one must consider the following
effects (select the most appropriate):
A.
B.
C.
D.
E.
Lorentz forces
Maxwell’s equations
Newton- Euler’s law.
All of the above
The above and other equations
46. Civilian Applications of Pulsed Power include (select all that apply):
A.
B.
C.
D.
E.
Magnetic Forming of Metals
Civilian Radar
Rail Guns
Stun Guns
All of the above
47. The wavelength range of commercial lasers used in LIDAR applications include:
A.
B.
C.
D.
E.
Xray, UV, Visible bands
UV, Visible, IR band
Gamma, Xray, UV band
Visible and IR band
None of the above
48. PID control stands for:
A.
B.
C.
D.
Predictive, Integrated, and Dynamic Control
Proportional, Integral, Derivative Control
Processing, Integration, and Deployment Controller
None of the above
49. A robot is defined as a:
A.
B.
C.
D.
E.
An entity that can sense, think and act.
An entity that can navigate and explore unknown environments
A mechanical structure controlled by feedback control
A machine that can imitate humans
All of the above
50. As I have taken and survived EE 1105, Freshman Seminar, and I now realize that I will need to pay a lot of
attention to:
A.
B.
C.
D.
E.
Linear Algebra, Differential Equations, Calculus, Physics
Discrete mathematics and Computer Programming
Abstract and algorithmic thinking
Hands on skills for testing and debugging of circuits
All of the above