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# MCQ in Engineering Electromagnetics Part 3 | ECE Board Exam

This is the Multiple Choice Questions Part 3 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 3 of the Series

Choose the letter of the best answer in each questions.

101. Maxwell’s equations in __________ form give information at points of discontinuity in electromagnetic fields.

A. Differential

B. Integral

C. Algebraic

D. None of these

Solution:

102. Another boundary condition using Maxwell’s equations is given as__________.

A. Htan ‘1’ + Htan ‘2’ = 0

B. Htan ‘1’ โ Htan ‘2’ = 0

C. Htan ‘1’ + Htan ‘2’ = Js

D. Htan ‘1’โ Htan ‘2’ = Js

Solution:

103. At the point of discontinuity, __________ component of magnetic flux density is continuous.

A. Tangential

B. Normal

C. None of these

D. Cannot say

Solution:

104. For those surfaces where surface charge density is __________ normal component of electric flux density is continuous.

A. Infinity

B. Unity

C. Zero

D. None of these

Solution:

105. Waves are used in __________.

A. TV

D. All of these

Solution:

106. Displacement current density ____________ current passing through a capacitor.

A. Represents

B. Does not represent

C. Is the same as

D. None of these

Solution:

107. Line integral of an electric field around a closed path is __________.

A. infinity

B. unity

C. zero

D. None of these

Solution:

108. __________ are caused by accelerated charges

A. Time-varying fields

B. Waves

C. Both (a) and (b)

D. None of these

Solution:

109. At the Brewster angle, polarization ______________.

A. Cannot be reflected

B. Is reflected at 30ยฐ

C. Is reflected at 90ยฐ

D. None of these

Solution:

110. Wave number has units of____________.

B. Meter

D. None of these

Solution:

111. Wave speed in terms of frequency f and wavelength ฮป is expressed as _________.

A. f/ฮป

B. ฮป/f

C. ฮป f

D. (ฮป + f)

Solution:

112. For a lossy dielectric medium, ____________.

A. ฯ = 0

B. ฯ โ  0

C. None of these

D. Cannot say

Solution:

113. Wave attenuation is given as ______________.

A. e+ฮฒx

B. e-ฮฒx

C. e+ฮฑx

D. eโฮฑx

Solution:

114. In the case of a perfect dielectric medium, phase constant______________ as conductivity increases.

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

Solution:

115. Phase velocity is given as _________.

A. ฯฮฒ

B. ฮฒฯ

C. ฮฒ/ฯ

D. None of these

Solution:

116. In good conductors, rate of attenuation is __________.

A. Small

B. Large

C. Infinity

D. Zero

Solution:

117. Power density has _________________.

A. A DC component

B. A second harmonic component

C. Both (a) and (b)

D. None of these

Solution:

118. Reflection coefficient ฮ is __________.

A. โฅ100

B. = 10

C. โค 1

D. None of these

Solution:

119. Which of the following expressions is correct?

A. (1 + ฮ) = ฯ

B. (1 + ฯ) = ฮ

C. (1 + ฮ) ฯ = 0

D. (1 + ฯ)ฮ = 0

Solution:

120. Standing wave consists of two travelling waves of ____________ amplitudes and _____________ is direction.

A. Unequal, same

B. Unequal, opposite

C. Equal, same

D. Equal, opposite

Solution:

121. SNR ranges from ______.

A. 0 to 1

B. 1 to 10

C. 10 to 100

D. 1 to โ

Solution:

122. The Smith chart is a ________ dimensional representation ofcomplex impedances with respect to coordinates.

A. Two

B. Three

C. Four

D. None of these

Solution:

123. In a _________ transmission line, the reflection coefficient domain isa circle of unitary radius.

A. Lossy

B. Lossless

C. None of these

D. Cannot say

Solution:

124. The Smith chart represents a family of circles obtained by varying normalized resistance in the range of __________.

A. โ1 to 0

B. 0 to 1

C. 0 to โ

D. โโ to โ

Solution:

125. A family of arcs is obtained in the Smith chart by varying normalized reactance in a range of __________.

A. โ1 to 0

B. 0 to 1

C. 0 to โ

D. โโ to โ

Solution:

126. Smith charts depict a wide impedance range of transmitter for _______VSWR.

A. Low

B. High

C. Medium

D. None of these

Solution:

127. A cable or a wire is considered as a transmission line if its length is _________of the wavelength of the signal travelling through it.

A. Greater than 1/10

B. Less than 1/10

C. Greater than 1/5

D. Less than 1/5

Solution:

128. Transmission lines facilitate _________propagation of energy.

A. Guided

B. Unguided

C. None of these

D. Cannot say

Solution:

129. A transmission line is specified in terms of _________.

A. R, G,L

B. G, L,C

C. R, G, L,C

D. None of these

Solution:

130. In planar transmission lines, C = _________.

A. ฯ b/d

B. ฮผ d/b

C. b/d

D. None of these.

Solution:

131. In a microstrip line, there is _________metal strip over the substrate.

A. A thin

B. A thick

C. No

D. None of these

Solution:

132. In a fully lossless line, ฯ = _________.

A. 0

B. 1

C. โ

D. None of these.

Solution:

133. In a distortion less line, attenuation constant ฮฑ is frequency_________.

A. Dependent

B. Independent

C. None of these

D. Cannot say

Solution:

134. A distortion less line has _________.

A. Non-vanishing attenuation constant

B. Constant velocity

C. Constant real characteristic impedance

D. All of these

Solution:

135. Voltage reflection coefficient is the ratio of _________ wave to_______ wave.

A. Incident, reflected

B. Reflected, incident

C. Incident, absorbed

D. Absorbed, incident

Solution:

136. ________ are very efficient in a frequency range of 3-300 GHz.

A. Transmission line

B. Wave guides

C. Both (a) and (b)

D. None of these

Solution:

137. Wave guides ________ in DC applications.

A. Can also be used

B. Cannot be used

C. None of these

D. Cannot say

Solution:

138. Wave guides are a type of _________ filter.

A. Low pass

B. All pass

C. Band pass

D. High pass

Solution:

139. For lossless wave guides, ฯc ________and ฯ ______

A. โ, 0

B. 0, โ

C. 0, 0

D. โ, โ

Solution:

140. In the TM mode, Ez _____ and Hz = ________.

A. 0, 0

B. 0, โ

C. โ 0

D. None of these

Solution:

141. In the TEM mode, Ez ______ and Hz =_______

A. 0, 0

B. 0, โ

C. โ, 0

D. None of these

Solution:

142. Below the cut-off frequency, there is_______________.

A. Attenuation

B. No attenuation

C. Amplification

D. None of these.

Solution:

143. Cut-off wavelength ฮปc in the TE10 mode is ____________.

A. a

B. 2a

C. 4a

D. 8a

Solution:

144. _______ velocity is the one at which loss of constant phase propagates down the guide.

A. Medium

B. Phase

C. Group

D. None of these

Solution:

145. Information or energy through the wave guide travels at _______velocity.

A. Medium

B. Phase

C. Group

D. None of these

Solution:

146. _______velocity is that whose resultant repeated reflected waves travel down the guide.

A. Medium

B. Phase

C. Group

D. None of these

Solution:

147. ________ vector is needed to determine power flow in wave guides.

A. Poynting

B. Average Poynting

C. Power

D. Phase

Solution:

148. Surface current density K on wave guide walls for ______ is given as

A. TM mode

B. TE mode

C. Both (a) and (b)

D. None of these

Solution:

149. At _______ frequencies, RLC resonant circuits are replaced by electromagnetic cavity resonators.

A. Low

B. Medium

C. High

D. None of these

Solution:

150. Resonator cavities are used in _______.

A. Klystron tubes

B. Band-pass filters

C. Wave meters

D. All of these

Solution:

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

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