Draft of October 2015 Electronics Engineering Board Exam Questions and Concepts

DRAFT OF OCTOBER 2015 ELECTRONICS ENGINEERING BOARD EXAM QUESTIONS AND CONCEPTS *Items enclosed in parentheses refer to the choices. MATHEMATICS EXACT QUESTIONS: 1. It shows the truth or falsity of a proposition. (truth table/truth sentence…) 2. Find the length of AB.

3. The population of Nicosia (Cyprus) is 75% Greek and 25% Turkish. 20% of the Greeks and 10% of the Turks speak English. A visitor of the town meets someone who speaks English. What is the probability that he is a Greek? (Source: Exercises in Probability by T. Cacoullos) SIGNIFICANT CONCEPTS: 4. Differential Equations 5. Indefinite integrals (e^ix), and properties of imaginary exponents 6. Boolean algebra 7. Probability 8. Recursion ELECTRONICS ENGINEERING EXACT QUESTIONS: 1. A small electric vehicle is powered by a 96 V battery and uses a series wound motor. It has a step-down chopper for forward drive and a step-up chopper for regenerative braking. The total armature resistance is 0.1 ohm, and the armature voltage constant is 10m V/A-rad/s. Descending a hill in regeneration mode the motor speed is 1000 rev/min and the armature current is a constant average value of 80A. Calculate the value of the duty cycle required and the available braking power. (Source: Introduction to Power Electronics by D. Fewson) 2. What is this circuit? Totem pole.

3. What is this circuit? Differential Amplifier.

4. He hypothesized that a current carrying conductor produces a magnetic field. (Faraday/Ampere) 5. BJT problem – Find Vc. All values of resistances and voltage sources are given.

6. What does the right symbol represent? P-channel, E-MOSFET

7. To ensure no distortion (Q-point biased at the middle of the characteristic curve) 8. Does not detect conductive material without touching it. (inductive sensor, proximity sensor, electronic proximity sensor) SIGNIFICANT CONCEPTS: 9. Power factor of a half-wave rectifier. 10. Characteristic curve is presented, find the ideal power output. BJT problem.

11. Find the power drawn from the sources (op-amp), input voltage pk-pk is given, current drawn from the sources, value of voltage source, output voltage pk-pk, input current.) GENERAL ENGINEERING AND APPLIED SCIENCES EXACT QUESTIONS: 1. The mass of a bullet is 2 grams and its velocity is 30,000 centimeters per second (approximately true for a .22 caliber bullet). What is its kinetic energy? (units in the choices are in gm-cm) 2. The theorem states that the moment of a resultant of two concurrent forces about any point is equal to the algebraic sum of the moments of its components about the same point. (Varignon’s theorem) 3. Nucleophiles – donates electrons 4. Electrophiles – accepts electrons 5. A sunk cost is a cost that has already been incurred and cannot be recovered. 6. Pappus' centroid theorem is either of two related theorems dealing with the surface areas and volumes of surfaces and solids of revolution. 7. How does a sodium ion differ from a sodium atom? (Sodium ion has an extra electron)

SIGNIFICANT CONCEPTS: 8. Mechanics (moment, sum of forces), concepts, and applications 9. Rotational kinetic energy 10. Compound interest 11. RA 9292 (sections and articles), other Laws related to ECE 12. Find the unknown force that will make the system in equilibrium. 13. Given the current flowing on a conductor, distance between the conductors, find the electric field intensity between them.

ELECTRONICS SYSTEMS AND TECHNOLOGIES

EXACT QUESTIONS: 1. Forward and reverse channel used in AMPS. 2. Interoperability - is the ability of different information technology systems and software applications to communicate 3. How does an FM broadcaster provide additional services (such as background music, etc.)? 4. A parallel plate capacitor is made from 9 plates, each 70 mm by 120 mm, interleaved with mica of relative permittivity 5. If the capacitance of the capacitor is 3000 pF determine the thickness of the mica. 5. A technique used by engineers to determine the total error, by calculating the total number of errored bits as a function of the total bits transmitted. (error detection/error sampling/error coding) 6. A type of error-correcting code where bits are interleaved continuously. (convolutional code/Manchester code/block coding/correlation coding) 7. Roaming helps ensure that a traveling wireless device (typically a cell phone) is kept connected to a network without breaking the connection. 8. The radiation pattern is a graphical depiction of the relative field strength transmitted from or received by the antenna. SIGNIFICANT CONCEPTS: 9. Information capacity calculations 10. OSI Layers 11. Aperture antenna calculations 12. Parabolic reflector calculations 13. Fresnel Zone calculations/analysis 14. HDTV (given pixels, frames per second, etc.) dimensional analysis OBSERVATIONS/SUGGESTIONS: (relative to Oct. 2015 ECE Board Exam) 1. MATH: Calcutech is key. (There were so many DE’s). It might be important to imitate the way the questions are presented in the board exam, i.e. one-liner display, because it is somehow confusing on the way the equations are presented. And be ready for typographical errors and misplaced marks; hence, the need for troubleshooting of questions. 2. ELEX: Learn the basics and concepts. Practice a lot of Q&A’s, because there are many objective-type questions per se (not only concepts-type of questions); hence, familiarize notable people in the field of electronics, significant terminologies, etc. Also, power electronics, digital electronics, and industrial electronics questions are still booming.

3. GEAS: Make a mnemonic regarding RA 9292, and other significant laws. Calcutech is of big help in this subject as well. There were a few errored questions. And majority of the questions came from basic statics (equilibrium of forces), and strength of materials. Learn the concepts, so you can answer even the advanced questions. There were some electromag topics not discussed during the review. 4. ESAT: Understanding the concepts is essential. Read and understand. Majority of the problems given are relative to getting the information capacity. Microwave problems are still numerous. And concepts-based questions, plus familiarizing on significant terminologies in this subject are a must.