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MCQ in Engineering Electromagnetics Part 6 | ECE Board Exam

This is the Multiple Choice Questions Part 6 of the Series in Engineering Electromagnetics as one of the Electronics Engineering 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 but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

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.

MCQ Topic Outline: Electromagnetic/Vector Analysis

• MCQ in Algebra of vectors
• MCQ in Vector Product
• MCQ in Vector Calculus
• MCQ in Vector Identities
• MCQ in Derivative of vector functions
• MCQ in Directional derivative, gradient, divergence, curl
• MCQ in Integral Theorems, Green’s Lemma, Divergence Theorem and Strokes’ Theorem

MCQ Topic Outline: Electromagnetics

• MCQ in Steady Electric and Magnetic Fields
• MCQ in Dielectric and Magnetic Materials
• MCQ in Resonance
• MCQ in Coupled and Magnetic Circuits
• MCQ in Time-varying Fields and Maxwell’s Equation

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. ยฑ 5%

B. ยฑ 10%

C. ยฑ 15%

D. ยฑ 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 ฮผF 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 ฮผf 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.ย ย ย ย ย ย ย ย  Charge in box

B.ย ย ย ย ย ย ย ย  Charge in dielectric

C.ย ย ย ย ย ย ย ย  Charge in space

D.ย ย ย ย ย ย ย ย  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.ย ย ย ย ย ย ย ย  Narrow bandwidth

B.ย ย ย ย ย ย ย ย  Poor directivity

C.ย ย ย ย ย ย ย ย  High standing wave ratio

D.ย ย ย ย ย ย ย ย  All of the above

Solution:

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

A.ย ย ย ย ย ย ย ย  Glass

B.ย ย ย ย ย ย ย ย  Oil

C.ย ย ย ย ย ย ย ย  Vacuum

D.ย ย ย ย ย ย ย ย  Ceramics

Solution:

298. Pick out the incorrect statement?

A.ย ย ย ย ย ย ย ย  The leakage resistance of ceramic capacitors is generally high

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

C.ย ย ย ย ย ย ย ย  A wire cable has distributed capacitance between the conductors

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

Solution:

299. A capacitor consists of two –

A.ย ย ย ย ย ย ย ย  insulators only

B.ย ย ย ย ย ย ย ย  conductors only

C.ย ย ย ย ย ย ย ย  conductors separated by an insulator

D.ย ย ย ย ย ย ย ย  insulators separated by a conductor

Solution:

300. What is the unit of capacitance?

A.ย ย ย ย ย ย ย ย  ohm

B.ย ย ย ย ย ย ย ย  farad

C.ย ย ย ย ย ย ย ย  henry

D.ย ย ย ย ย ย ย ย  None of the above

Solution:

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

A.ย ย ย ย ย ย ย ย  Air

B.ย ย ย ย ย ย ย ย  Mica

C.ย ย ย ย ย ย ย ย  Paper

D.ย ย ย ย ย ย ย ย  Electrolytic

Solution:

302. The Stokeโs theorem uses _________ operation?

A.ย ย ย ย ย ย ย ย  Curl

B.ย ย ย ย ย ย ย ย  Gradient

C.ย ย ย ย ย ย ย ย  Laplacian

D.ย ย ย ย ย ย ย ย  Divergence

Solution:

303. The Greenโs theorem can be related to __________.

A.ย ย ย ย ย ย ย ย  Eulerโs theorem

B.ย ย ย ย ย ย ย ย  Leibnitzโs theorem

C.ย ย ย ย ย ย ย ย  Stokeโs theorem

D.ย ย ย ย ย ย ย ย  None of the above

Solution:

304. The Gaussian surface is –

A.ย ย ย ย ย ย ย ย  Tangential

B.ย ย ย ย ย ย ย ย  Real boundary

C.ย ย ย ย ย ย ย ย  Imaginary surface

D.ย ย ย ย ย ย ย ย  None of the above

Solution:

305. Gauss law cannot be used to find

A.ย ย ย ย ย ย ย ย  Charge

B.ย ย ย ย ย ย ย ย  Permittivity

C.ย ย ย ย ย ย ย ย  Electric field intensity

D.ย ย ย ย ย ย ย ย  None of the above

Solution:

306. Parabolic & lens antenna are commonly used in

A.ย ย ย ย ย ย ย ย  medium frequency

B.ย ย ย ย ย ย ย ย  Microwave frequency

C.ย ย ย ย ย ย ย ย  Low frequency

D.ย ย ย ย ย ย ย ย  High frequency

Solution:

307. A dielectric material must be –

A.ย ย ย ย ย ย ย ย  insulator

B.ย ย ย ย ย ย ย ย  resistor

C.ย ย ย ย ย ย ย ย  Electric field

D.ย ย ย ย ย ย ย ย  None of the above

Solution:

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

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