# MCQ in Engineering Electromagnetics Part 5 | ECE Board Exam

(Last Updated On: June 17, 2022) This is the Multiples Choice Questions Part 5 of the Series in Engineering Electromagnetics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

### PRC Board of Electronics Engineering Examination Syllabi (ECE Board)

The licensure exam shall cover different areas in the field of Electronics Engineering as prescribed by the Board. Under the Implementing Rules and Regulation of R.A. 9292, the licensure exam shall compose of four subjects each with 100 items covering different areas and with its own bearing to the overall rating. The applicant shall have a general weighted average of more than 70% and a grade above 70% for each subject areas to pass the licensure exam.

Mathematics – 20%

1. College Algebra

• Equations in One Variable
• Functions
• Determinants
• Matrices
• Sequences and Series

2. Trigonometry

• Trigonometric functions
• Applications

3. Geometry

• Analytic Geometry
• Plane Geometry
• Solid Mensuration

4. Differential Calculus

• Derivatives and its Applications
• Functions, Continuity and Limits
• Higher-Order Derivatives
• Parametric Equations and Partial Differentiation

5. Integral Calculus

• Integration and its Applications
• Surface and Multiple Integrals and its Applications

6. Differential Equations

• First-Order, First-Degree ODE and its Applications
• Higher-Order ODE and its Applications

• Complex Number and its Applications
• Power Series, Fourier Series and its Applications
• Laplace Transforms, Inverses, and its Applications
• Fourier Transforms, Inverses and its Applications
• Z-Transforms
• Partial Differential Equations

8. Probability and Statistics

• Fundamental Principles of Counting
• Permutations and Combinations
• Measures of Central Tendency and Variations
• Probability Distributions
• Presentation of Data and Sampling Techniques
• Inferential Statistics
• Analysis of Variance, Regressions and Correlations

9. Discrete Mathematics

• Set Theory and Mathematical Logic
• Binary Operations
• Growth of Functions
• Algorithms

10. Numerical Methods

• Analysis of Errors
• Evaluation of Series Expansion of Functions
• Analysis of Variance, Regressions and Correlations
• Simultaneous Linear and Nonlinear
• ODE
• PDE

General Engineering and Applied Sciences – 20%

1. Engineering Mechanics

2. Strength of Materials

3. College Physics

4. General Chemistry

5. Thermodynamics

6. Engineering Materials

7. Engineering Economics

8. Engineering Management

9. Electromagnetics

10. Laws and Ethics

• Contract and specifications
• Telecommunications and broadcasting laws and regulations
• Electronics Engineering Law of 2004
• Code of professional ethics and conduct
• Philippine electronic code

Electronics Engineering – 30%

1. Electricity/Magnetism Fundamentals

• Atomic Structure
• Electric Charge
• Laws (ohms, Kirchhoff, coulomb, etc.)
• Magnetic Power
• Magnetic field/flux
• Magnetic/electric quantities/units
• Magnetic/electromagnet principles

2. Electrical Circuit

• Ac-dc circuits
• Resistors
• Inductors
• Capacitor

3. Solid State Devices/Circuits

• Semi-conductor fundamentals
• Transistor components, circuits, analysis, and design
• Special services (photo, electric, photo voltaic etc.)

4. Power Generator, Sources, Principles and Applications

• Cells and batteries
• Electric Generator
• Electronic power supply
• Voltage regulation
• Distribution transformer
• MUPS/Float-battery system
• Converters/inverters

5. Electronic (Audio/RF) Circuit, Analysis and Design

• Amplifiers
• Oscillators
• Rectifier
• Filters
• Voltage regulation

6. Tests and Measurements

• Volt-ohm-ammeter (analog/digital)
• R-L-Z bridges
• Oscilloscope
• RF meters
• Signal generators (audio, RF, video)
• Noise generators
• Power/reflectometer/grid dip meter

7. Microelectronics

• Integrated circuits components, characteristics, and products
• Operational amplifiers/multivibrators

8. Industrial Electronics Principles and Applications

• Electronic control system
• Industrial solid-state services
• Welding system/high frequency heating
• Feedback systems/servomechanism
• Transducers
• Motor speed control systems
• Robotic principles
• Bioelectrical principles
• Instrumentation and control

9. Computer Principles

• Analog/digital system
• Binary number system, Boolean algebra
• Mathematical logic and switching networks
• Basic digital circuits (logic, gates, flip-flops, multivibrators etc.)
• Static and dynamic memory devices
• Programming and machine languages
• Information and acquisition processing
• Analog/Digital conversion
• Computer Networking

Electronics Systems and Technologies – 30%

1. Transmission Fundamentals

• Transmission system
• Transmission medium
• Primary line constants
• Velocity and line wavelength
• Characteristic Impedance
• Propagation constants
• Phase and group velocity
• Standing waves
• Voltage Standing Wave Ratio
• Telephone lines and cables
• Wave guides
• Balanced and unbalanced lines
• Twisted pair wire
• Coaxial Cable
• The decibel
• Power dB calculations
• Signal and Noise fundamentals

2. Acoustics

• Definition
• Frequency range
• Sound pressure level
• Sound Intensity
• Loudness level
• Pitch and frequency
• Internal and octave
• Sound distortion
• Room acoustics
• Electro-Acoustics transducers

3. Modulation

• Amplitude modulation
• Phase modulation
• Frequency modulation
• Pulse modulation

4. Noise

• External noise
• Phase noise
• Noise calculation and measurements

• Wave propagation
• Wavelength calculations
• Diversity systems

6. Antennas

• Basic considerations
• Current and voltage distribution
• Resonant, non-resonant antennas
• Terms and definition
• Antenna gain and resistance
• Bandwidth, beamwidth, polarization
• Effects of ground on antennas
• Grounded, ungrounded antennas
• Grounding systems
• Antenna height
• Design and applications
• Matching systems
• Impedance calculations
• Antenna types
• Directional and non-directional
• Microwave antennas
• Wideband and Special purpose antennas

7. Wire and wireless communications System

• The telephone set
• Connection and performance
• Exchange area plant
• Loop design
• Trunks in the exchange plant
• Insertion loss
• Traffic calculations
• Reference Equivalent and standards
• Telephone networks
• Signaling, Billing, CAMA, ANI
• Echo, signing and design loss
• Via net loss
• Network hierarchy, class type
• VF repeaters
• Transmission considerations in long distance network
• Telephone features – IDD, NDD, LEC
• Mobile communications

8. Microwave Communications and Principles

9. Basic principles of various Electronics System

• Electro-optics/photonics/optoelectronics
• Electromagnetic
• Avionics, aerospace, navigational and military applications
• Medical electronics
• Cybernetics
• Biometrics

B. Digital and Data Communications Systems

1. Digital Communication Networks

• Bit and Binary transmission
• Signaling rate
• Error probability
• Digital filtering
• Switching
• Packet circuit
• Vertical circuit
• Open systems interconnection
• Multiplying, modulation, and synchronization
• Pulse code modulation
• Companding
• Encoding
• Bandwidth and signal to noise ratio
• Delta modulation
• Codes and protocol
• Error detection and correction codes
• Digital carrier systems
• Frequency shift keying
• Phase shift keying
• Differential phase shift keying
• DC nature of data transmission
• Loops
• Neutral and polar
• Binary transmission and the concept of time
• Asynchronous and synchronous
• Timing
• Distortion
• Bits, band, WPM
• Data interface standards
• Data input/output devices
• Digital transmission on analog channel
• Modulation – demodulation schemes parameters
• Circuit conditioning
• Modem applications
• Serial and parallel transmission

2. Fiber Optics

• Principles of light, transmission
• Types
• Light sources, laser, LED
• Light detectors
• Modulation and waveform
• System design
• General application
• Design procedure
• Dispersion limited domain
• System bandwidth
• Splicing techniques

3. Satellite, Broadcasting and Cable TV System

a. Satellite system

• The satellite system
• Types of satellite
• Satellite orbit
• Demand assignments multiple access
• Antenna tracking
• Path loss
• Figure of merit
• Ratio of carrier to thermal noise power
• Station margin
• VSAT

b. Broadcasting and Cable TV System

• Radio transmitter (AM, FM, Television)
• Studio (Microphone, Amplifiers, Cameras, Lighting etc.)
• Cable television

#### Continue Practice Exam Test Questions Part 5 of the Series

Choose the letter of the best answer in each questions.

201. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

A. 60 N

B. 30 N

C. 40 N

D. 15 N

Solution:

202. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be

A. 400 N/C

B. 600 N/C

C. 800 N/C

D. 1200 N/C

Solution:

203. The lines of force due to charged particles are

A. always straight

B. always curved

C. sometimes curved

D. none of the above

Solution:

204. The electric field at a point situated at a distance d from straight charged conductor is

A. proportional to d

B. inversely proportional to d

C. inversely proportional to d

D. none of the above

Solution:

205. The direction of electric field due +0 positive charge is .

A. away from the charge

B. towards the charge

C. both (a) and (b)

D. none of the above

Solution:

206. A field line and an equipotential surface are

A. always parallel

B. always at 90°

C. inclined at any angle 0

D. none of the above

Solution:

207. The ability of charged bodies to exert force on 6ne another is attributed to the existence of

A. electrons

B. protons

C. neutrons

D. electric field

Solution:

208. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

A. decrease

B. increase

C. remains unchanged

D. become zero

Solution:

209. For making a capacitor, it is better to select a dielectric having

A. low permittivity

B. high permittivity

C. permittivity same as that of air

D. permittivity slightly more than that of air

Solution:

210. The units of capacitance area

A. volts/coulomb

B. coulombs/volt

C. ohms

D. henry/Wb

Solution:

211. If three 15 µF capacitors are connected in series, the net capacitance is

A. 5 µF

B. 30 µF

C. 45 µF

D. 50 µF

Solution:

212. If three 10 µF capacitors are connected in parallel, the net capacitance is

A. 20 µF

B. 30 µE

C. 40 µF

D. 50 µF

Solution:

213. An electrolytic capacitor can be used for

A. D.C. only

B. AC. only

C. both

D. C. as well as A.C.

Solution:

214. Which of the following is not a vector?

A. Linear momentum

B. Angular momentum

C. Electric field

D. Electric potential

Solution:

215. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

A. Voltage across the plates increases

B. voltage across the plates decreases

C. charge on the capacitor decreases

D. charge on the capacitor increases

Solution:

216. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because

A. varying voltage produces the charging and discharging currents

B. of high peak value

C. charging current can flow

D. discharge current can flow

Solution:

217. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant?

A. 50

B. 100

C. 150

D. 200

Solution:

218. Which of the following statements is correct?

A. Air capacitors have a black band to indicate the outside foil

B. Electrolytic capacitor must be connected in the correct polarity

C. Ceramic capacitors must be connected in the correct polarity

D. Mica capacitors are available in capacitance value of 1 to 10 pF

Solution:

219. The dissipation factor of a good dielectric is of the order of

A. 0.0002

B. 0.002

C. 0.02

D. 0.2

Solution:

220. “The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed”. The above statement is associated with

A. Coulomb’s square law

B. Gauss’s law

C. Maxwell’s first law

D. Maxwell’s second law

Solution:

221. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them

A. all in series

B. all in parallel

C. two in parallel and third in series with this combination

D. two in series and third in parallel across this combination

Solution:

222. For which of the following parameter variation, the capacitance of the capacitor remains unaffected?

A. Distance between plates

B. Area of the plates

C. Nature of dielectric

D. Thickness of the plates

Solution:

223. Which of the following statement is true?

A. The current in the discharging capacitor grows linearly

B. The current in the discharging capacitor grows exponentially

C. The current in the discharging capacitor decays exponentially

D. The current in the discharging capacitor decreases constantly

Solution:

224. Which of the following expression is correct for electric field strength?

A. E = D/E

B. E = D2/t

C. E = jtD

D. E= nD2

Solution:

225. In a capacitor the electric charge is stored in

A. metal plates

B. dielectric

C. both (a) and (b)

D. none of the above

Solution:

226. Which of the following materials has the highest value of dielectric constant?

A. Glass

B. Vacuum

C. Ceramics

D. Oil

Solution:

227. Which of the following capacitors will have the least variation?

A. Paper capacitor

B. Ceramic capacitor

C. Silver plated mica capacitor

D. None of the above

Solution:

228. Which of the following statements is incorrect?

A. The leakage resistance of ceramic capacitors is generally high

B. The stored energy in a capacitor decreases with reduction in value of capacitance

C. The stored energy in a capacitor increases with applied voltage

D. A wire cable has distributed capacitance between the conductors

Solution:

229. Which of the following capacitors has relatively shorter shelf life?

A. Mica capacitor

B. Electrolytic capacitor

C. Ceramic capacitor

D. Paper capacitor

Solution:

230. In the case of a lossy capacitor, its series equivalent resistance value will be

A. small

B. very small

C. large

D. zero

Solution:

231. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will

A. remains uncharged

B. decrease

C. increase

D. become zero

Solution:

232. Capacitance increases with

A. increase in plate area and decrease in distance between the plates

B. increase in plate area and distance between the plates

C. decrease in plate area and value of applied voltage

D. reduction in plate area and distance between the plates

Solution:

233. A capacitor consists of

A. two insulators separated by a conductor

B. two conductors separated by an insulator

C. two insulators only

D. two conductors only

Solution:

234. A gang condenser is a

A. polarized capacitor

B. variable capacitor

C. ceramic capacitor

D. none of the above

Solution:

235. A paper capacitor is usually available in the form of

A. tubes

B. rolled foil

C. disc

D. meshed plates

Solution:

236. Air capacitors are generally available in the range

A. 10 to 400 pF

B. 1 to 20 pF

C. 100 to 900 pF

D. 20 to 100 pF

Solution:

237. The unit of capacitance is

A. henry

B. ohm

Solution:

238. A capacitor charged to 200 V has 2000 µC of charge. The value of capacitance will be

A. 10 F

B. 10 µF

C. 100 nF

D. 1000 µF

Solution:

239. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be?

A. Paper capacitor

B. Ceramic capacitor

C. Electrolytic capacitor

D. Any-of the above

Solution:

240. Energy stored in the electric field of a capacitor C when charged from a D.C. source of voltage V is equal to joules

A. CV2

B. C2V

C. CV3

D. CV

Solution:

241. The absolute permittivity of free space is given by

A. 8.854 x 10-9 F/m)

B. 8.854 x 10-10 F/m)

C. 8.854 x 10-11 F/m

D. 8.854 x 10-12 F/m

Solution:

242. The relative permittivity of free space is given by

A. 1

B. 10

C. 100

D. 1000

Solution:

243. Electric field intensity is a quantity

A. scalar

B. vector

C. both (a) and (b)

D. none of the above

Solution:

244. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

A. 2 joules

B. 4 joules

C. 6 joules

D. 8 joules

Solution:

245. The capacitor preferred for high frequency circuits is

A. air capacitor

B. mica capacitor

C. electrolytic capacitor

D. none of the above

Solution:

246. The capacity of capacitor bank used in power factor correction is expressed in terms of

A. kW

B. kVA

C. kVAR

D. volts

Solution:

247. While testing a capacitor with ohm-meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

A. short-circuited

B. open circuited

C. alright

D. leaky

Solution:

248. If a 6 µF capacitor is charged to 200 V, the charge in coulombs will be

A. 800 µC

B. 900 µC

C. 1200 µC

D. 1600 µC

Solution:

249. Which capacitor will be physically smaller for the same ratings?

A. Ceramic capacitor

B. Paper capacitor

C. Both will be of equal size

D. None of the above

Solution:

250. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF?

A. 50 pF

B. 100 pF

C. 150 pF

D. 200 pF

Solution:

### Complete List of MCQs in General Engineering and Applied Science per topic

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