# MCQ in Engineering Electromagnetics Part 6 | ECE Board Exam

(Last Updated On: November 17, 2022) This is the Multiples Choice Questions Part 6 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 6 of the Series

Choose the letter of the best answer in each questions.

251. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance?

A. Ceramic capacitor

B. Mica capacitor

C. Both will have identical value of capacitance

D. It depends on applied voltage

Solution:

252. Which of the following material has least value of dielectric constant?

A. Ceramics

B. Oil

C. Glass

D. Paper

Solution:

253. Which of the following capacitors will have the least value of breakdown voltage?

A. Mica

B. Paper

C. Ceramic

D. Electrolytic

Solution:

254. Dielectric constant for mica is nearly

A. 200

B. 100

C. 3 to 8

D. 1 to 2

Solution:

255. The value of dielectric constant for vacuum is taken as

A. zero

B. 1

C. 4

D. 10

Solution:

256. Which of the following capacitors is marked for polarity?

A. Air

B. Paper

C. Mica

D. Electrolytic

Solution:

257. Which of the following capacitors can be used for temperature compensation?

A. Air capacitor

B. Ceramic capacitor

C. Paper capacitor

D. None of the above

Solution:

258. Which of the following statements is incorrect?

A. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor.

B. A six dot mica capacitor color coded white, green, black, red, and yellow has the capacitance value of 500 pF

C. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

D. A capacitor can store charge because it has a dielectric between two conductors

Solution:

259. Paper capacitors usually have a tolerance of

A. ± 5%

B. ± 10%

C. ± 15%

D. ± 20%

Solution:

260. For closer tolerances which of the following capacitors is usually preferred?

A. Paper capacitor

B. Mica capacitor

C. Ceramic disc capacitor

D. None of the above

Solution:

261. The electrostatic force between two charges of one coulomb each and placed at distance of 0.5 m will be

A. 36 x 106 N

B. 36 x 107 N

C. 36 x 108 N

D. 36 x 109 N

Solution:

262. The units of volume charge density are

A. Coulomb/meter

B. Coulomb/meter

C. Coulomb/meter

D. Coulomb/meter

Solution:

263. “The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”. The above statement is associated with

A. Gauss’s law

B. Kirchhoff s law

D. Lenz’s law

Solution:

264. Dielectric strength of mica is

A. 10 to 20 kV/mm

B. 30 to 50 kV/mm

C. 50 to 200 kV/mm

D. 300 to 500 kV/mm

Solution:

265. The dielectric constant (relative permittivity) of glass is given by

A. 0.1 to 0.4

B. 0.5 to 1.0

C. 2.0 to 4.0

D. 5 to 100

Solution:

266. capacitors are mainly used for radio frequency tuning.

A. Paper

B. Air

C. Mica

D. Electrolytic

Solution:

267. capacitors can be used only for D.C.

A. Air

B. Paper

C. Mica

D. Electrolytic

Solution:

268. capacitors are used in transistor circuits.

A. Ceramic

B. Paper

C. Air

D. Electrolytic

Solution:

269. Capacitors are used for audio frequency and radio frequency coupling and tuning.

A. Air

B. Mica

C. Plastic film

D. Ceramic

Solution:

270. The inverse of capacitance is called

A. reluctance

B. conductance

C. susceptance

D. elastance

Solution:

271. When the dielectric is homogeneous, the potential gradient is

A. uniform

B. non-uniform

C. zero

D. any of the above

Solution:

272. The potential gradient across the material of low permittivity is than across the material of high permittivity.

A. smaller

B. greater

C. both (a) and (b)

D. none of the above

Solution:

273. field is associated with the capacitor.

A. Electric

B. Magnetic

C. Both (a) and (b)

D. None of the above

Solution:

274. A capacitor having capacitance of 5 μF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is

A. 50 joules

B. 150 joules

C. 200 joules

D. 250 joules

Solution:

275. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is

A. 62 x 105 V/m

B. 72 x 105 V/m

C. 82 x 105 V/m

D. 92 x 105 V/m

Solution:

276. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

A. 0.56 x 1015 m/s2

B. 1.5 x 1015 m/s2

C. 1.6 x 1015 m/s2

D. 1.76 x 1015 m/s2

Solution:

277. The total deficiency or excess of electrons in a body is known as

A. current

B. voltage

D. charge

Solution:

278. The relative permittivity has the following units

A. F/m

B. m/F

C. Wb/m

D. no units

Solution:

279. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as

A. photoelectric effect

B. chemical effect

C. magnetic effect

D. induction

Solution:

280. A unit tube of flux is known as tube

A. Newton

C. Michale

D. None of the above

Solution:

281. The number of Faraday tubes of flux passing through a surface in an electric field is called

A. electric flux

B. electric flux density

C. magnetic flux density

D. electric charge density

Solution:

282. The unit of electric intensity is

A. N/C2

B. Wb/m2

C. N/C

D. N2/C

Solution:

283. The value of E within the field due to a point charge can be found with the help of

B. Kirchhoff s laws

C. Coulomb’s laws

D. none of the above

Solution:

284. at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point.

A. Electric intensity

B. Magnetic flux density

C. Electric flux

D. None of the above

Solution:

285. Electric intensity at any point in an electric field is equal to the at that point.

A. electric flux

B. magnetic flux density

D. none of the above

Solution:

286. Electric displacement is a quantity.

A. scalar

B. vector

C. both of the above

D. none of the above

Solution:

287. at a point is equal to the negative potential gradient at that point.

A. Electric intensity

B. Electric flux

C. Magnetic flux

D. Magnetic flux density

Solution:

288. The unit of dielectric strength is given by

A. V/m

B. V2/m

C. m/V

D. m/V2

Solution:

289. Dielectric strength ______with increasing thickness

A. increases

B. decreases

C. remains unaltered

D. none of the above

Solution:

290. The property of a capacitor to store electricity is called its

A. capacitance

B. charge

C. energy

D. none of the above

Solution:

291. ________ is that property of a capacitor which delays any change of voltage across it.

A. Inductance

B. Capacitance

D. None of the above

Solution:

292. A capacitance of 100 μf if is connected in series with a resistance of 8000 ohms. The time constant of the circuit is

A. 0.2 s

B. 0.4

C. 0.6 s

D. 0.8 s

Solution:

293. In a cable capacitor, voltage gradient is maximum at the surface of the

A. earth

B. conduction

C. sheath

D. insulator

Solution:

294. Which of the following is the example of spherical system?

A.         Charge in box

B.         Charge in dielectric

C.         Charge in space

D.         Uncharged system

Solution:

295. Which of the following is the radiation pattern of a parabola antenna?

A. Figure of directional

B. Omnidirectional

C. Highly directional

D. None of the above

Solution:

296. What is the main disadvantage of the two-hole directional coupler?

A.         Narrow bandwidth

B.         Poor directivity

C.         High standing wave ratio

D.         All of the above

Solution:

297. Which material has the highest value of dielectric constant?

A.         Glass

B.         Oil

C.         Vacuum

D.         Ceramics

Solution:

298. Pick out the incorrect statement?

A.         The leakage resistance of ceramic capacitors is generally high

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

C.         A wire cable has distributed capacitance between the conductors

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

Solution:

299. A capacitor consists of two –

A.         insulators only

B.         conductors only

C.         conductors separated by an insulator

D.         insulators separated by a conductor

Solution:

300. What is the unit of capacitance?

A.         ohm

C.         henry

D.         None of the above

Solution:

301. Which of the following capacitors are mainly used for radio frequency tuning?

A.         Air

B.         Mica

C.         Paper

D.         Electrolytic

Solution:

302. The Stoke’s theorem uses _________ operation?

A.         Curl

C.         Laplacian

D.         Divergence

Solution:

303. The Green’s theorem can be related to __________.

A.         Euler’s theorem

B.         Leibnitz’s theorem

C.         Stoke’s theorem

D.         None of the above

Solution:

304. The Gaussian surface is –

A.         Tangential

B.         Real boundary

C.         Imaginary surface

D.         None of the above

Solution:

305. Gauss law cannot be used to find

A.         Charge

B.         Permittivity

C.         Electric field intensity

D.         None of the above

Solution:

306. Parabolic & lens antenna are commonly used in

A.         medium frequency

B.         Microwave frequency

C.         Low frequency

D.         High frequency

Solution:

307. A dielectric material must be –

A.         insulator

B.         resistor

C.         Electric field

D.         None of the above

Solution:

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

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