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MCQ in Engineering Electromagnetics Part 5 | ECE Board Exam

This is the Multiple Choice Questions Part 5 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 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 90ยฐ

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 ยตF capacitors are connected in series, the net capacitance is

A. 5 ยตF

B. 30 ยตF

C. 45 ยตF

D. 50 ยตF

Solution:

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

A. 20 ยตF

B. 30 ยตE

C. 40 ยตF

D. 50 ยตF

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 ยตC of charge. The value of capacitance will be

A. 10 F

B. 10 ยตF

C. 100 nF

D. 1000 ยตF

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 ยตF capacitor is charged to 200 V, the charge in coulombs will be

A. 800 ยตC

B. 900 ยตC

C. 1200 ยตC

D. 1600 ยตC

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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