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# MCQ in Engineering Electromagnetics Part 4 | ECE Board Exam

This is the Multiple Choice Questions Part 4 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 4 of the Series

Choose the letter of the best answer in each questions.

151. Cavity is a rectangular wave guide _______.

A. Open at both ends

B. Shorted at both ends

C. With one end open and the other shorted

D. None of these

Solution:

152. Antenna tuning is done by changing its___________.

A. Inductive reactances

B. Capacitive reactances

C. Both (a) and (b)

D. None of these

Solution:

153. Resonant frequency of an antenna depends upon its___________.

A. Physical length

B. Electrical length

C. None of these

D. Cannot say

Solution:

154. Impedance of an antenna is matched to feed___________.

A. Line

C. Both (a) and (b)

D. None of these

Solution:

155. In low-power applications, ideal SWR is___________.

A. 1:1

B. 1:2

C. 2:1

D. 2:2

Solution:

156. Which of the following is a low-gain antenna?

A. Dish antenna on a space craft

B. Wi-Fi antenna

C. Both (a) and (b)

D. None of these

Solution:

157. In the case of an ideal isotropic antenna, the geometric radiation pattern is___________.

A. Circle

B. Sphere

C. Parabola

D. Hyperbola

Solution:

158. Antenna gain is minimum at radiation pattern___________.

A. Side lobes

B. Back lobes

C. None of these

D. Gain is independent of the radiation pattern

Solution:

159. Elliptical polarization can be of___________.

A. Left hand

B. Right hand

C. Either (a) or (b)

D. None of these

Solution:

160. Transmitters used on vehicles are__________ polarized.

A. Linearly

B. Circularly

C. Both (a) and (b)

D. None of these

Solution:

161. Antenna bandwidth can be increased by using__________.

A. A feed horn

B. Thicker wires

C. Cages

D. All of these

Solution:

162. Antenna array is__________.

A. 1-D

B. 2-D

C. Either (a) or (b)

D. None of these

Solution:

163. Array factor depends upon__________.

A. Number of elements

B. Spacing among elements

C. Phase of the applied signal

D. All of these

Solution:

164. If antenna directivity and antenna gain are equal, then antenna efficiency is __________%.

A. 20

B. 50

C. 75

D. 100

Solution:

165. If antenna array elemental spacing is large, then directivity will be__________.

A. Small

B. More

C. None of these

D. Cannot say

Solution:

166. On the basis of the radiation pattern, an antenna array is__________.

B. End fire

C. Either (a) or (b)

D. None of these

Solution:

167. In __________array, radiation is perpendicular to array orientation.

B. End fire

C. None of these

D. Cannot say

Solution:

168. In __________array, radiation is in the same direction as the array orientation.

B. End fire

C. None of these

D. Cannot say

Solution:

169. A large aperture means antenna gain will be__________.

A. Large

B. Small

C. None of these

D. Cannot say

Solution:

170. A short dipole antenna is__________.

A. Left end-fed

B. Right end-fed

C. Centre-fed

D. None of these

Solution:

171. The force between two charges is 120 N. if the distance between the charge is doubled, the force will be

A. 60 N

B. 30 N

C. 40 N

D. 15 N

Solution:

172. The electric field intensity at a point situated at 4 meters away from a point charge 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:

173. A hole of radius b (b < a) is now drilled along the length of the wire at a distance d from the center of the wire as shown below. The magnetic field inside the hole is

A. uniform and depends only on d

B. uniform and depends only on b

C. uniform and depends on both b and d

D. non uniform

Solution:

174. The line of force due to charged particles are always

A. Always straight

B. Always curve

C. Always circle

D. None of the above

Solution:

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

A. Proportional to d

B. Inversely proportional to d

C. Inversely proportional to distance

D. None of the above

Solution:

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

A. Away from the charge

B. Towards the charge

C. Both (a) & (b)

D. None of the above

Solution:

177. A field line and equipotential surface are

A. Always parallel

B. Always at 90 angle

C. Inclined at any angle

D. None of the above

Solution:

178. The ability of charged bodies to exert force on any another is attributed to the existence of

A. Electrons

B. Protons

C. Neutrons

D. Electric field

Solution:

179. A capacitor stored 0.24 coulombs at 10 volts, its capacitance is

A. 0.024F

B. 0.12 F

C. 0.6 F

D. 0.8 F

Solution:

180. 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:

181. The units of capacitance are

A. Volts/coulomb

B. Coulombs/volt

C. Ohms

D. Henry/wb

Solution:

182. If three 15 ยตf capacitors are connected in series, the net capacitance is

A. 5 ยตf

B. 30 ยตf

C. 40 ยตf

D. 50 ยตf

Solution:

183. A dielectric material must be

A. Resistor

B. Insulator

C. Good conductor

D. Semi-conductor

Solution:

184. An electrolytic capacitor can be used for

A. D.C. only

B. AC .only

C. Both

D. C. as well as A.C.

Solution:

185. The capacitance of a capacitor is not affected by

A. Distance between plates

B. Area of plates

C. Thickness of plates

D. All of the above

Solution:

186. Which of the following is not a vector?

A. Linear momentum

B. Angular momentum

C. Electric field

D. Electric potential

Solution:

187. Two plates of 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:

188. 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. Discharge current can flow

D. Charging current can flow

Solution:

189. 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:

190. 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:

191. The dissipation factor of good dielectric is of the order of

A. 0.0002

B. 0.002

C. 0.02

D. 0.2

Solution:

192. โthe total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed โ.

A. Coulombโs square law

B. Gaussโs law

C. Maxwellโs first law

D. Maxwellโs second law

Solution:

193. 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:

194. 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:

195. In a capacitor the electric charge is stored in

A. Glass

B. Vacuum

C. Ceramics

D. Oils

Solution:

196. 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:

197. Which of the following capacitor has relatively shorter shelf life?

A. Mica capacitor

B. Electrolytic capacitor

C. Ceramic capacitor

D. Paper capacitor

Solution:

198. The sparking between two electrical contacts can be reduced by inserting a

A. Capacitor in parallel with contacts

B. Capacitor in series with each contact

C. Resistance in line

D. None of the above

Solution:

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

A. Small

B. Very small

C. Large

D. Zero

Solution:

200. The power dissipated in a pure capacitor is

A. Zero

B. Proportional to applied voltage

C. Proportional to value of capacitance

D. Both (b) and (c) above

Solution:

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

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