MCQs in Radiation and Wave Propagation Part III

(Last Updated On: September 10, 2019)

MCQs in Radiation and Wave Propagation - Part III

This is the Multiples Choice Questions Part 3 of the Series in Radiation and Wave Propagation as one of the Communications 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 Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Online Questions and Answers Topic Outline

  • MCQs in Electromagnetic Radiation
  • MCQs in Radio Spectrum
  • MCQs in Wave Propagation
  • MCQs in Radiation Patterns
  • MCQs in Wavelength Calculations
  • MCQs in Radiation Resistance
  • MCQs in Diversity Systems

MCQs in Radiation and Wave Propagation Series

Following is the list of multiple choice questions in this brand new series:

Radiation and Wave Propagation MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII

Continue Practice Exam Test Questions Part III of the Series

101. Next lowest layer in the ionosphere.

  • a. D
  • b. E
  • c. F1
  • d. F2

102. What is the primary cause of ionization in the atmosphere?

  • a. Sun spot
  • b. Cosmic rays
  • c. Galactic disturbance
  • d. Ultraviolet radiation

103. Which layer does not disappear at night?

  • a. D
  • b. E
  • c. F1
  • d. F2

104. Which of the following uses surface wave propagation?

  • a. ELF
  • b. VLF
  • c. MF
  • d. All of these

105. The ability of the ionosphere to reflect a radio wave back to the earth is determined by

  • a. Operating frequency
  • b. Ion density
  • c. Angle of incidence
  • d. All of these

106. Highest frequency that can be used for sky wave propagation between two given points on earth.

  • a. Critical frequency
  • b. MUF
  • c. Cut –off frequency
  • d. UHF

107. The shortest distance measured along the earth’s surface that a sky wave is returned to earth.

  • a. MUF
  • b. Quarter-wavelength
  • c. Skip distance
  • d. Skip zone

108. Fluctuation in the signal strength at the receiver.

  • a. Interference
  • b. Fading
  • c. Tracking
  • d. Variable frequency

109. Two or more antennas are used separated by several wavelengths

  • a. Space diversity
  • b. Frequency diversity
  • c. Hybrid diversity
  • d. Polarization diversity

110. Two or more receivers are used using a single antenna.

  • a. Space diversity
  • b. Frequency diversity
  • c. Hybrid diversity
  • d. Polarization diversity

111. One of the following is not a cause of fading.

  • a. Interference between upper and lower rays of a sky wave.
  • b. Sky waves arriving at different number of hops
  • c. Interference due to ground reflected wave and sky wave
  • d. Diversity

112. What do you call the gigantic emissions of hydrogen from the sun?

  • a. Solar flares
  • b. SIDs
  • c. Kennely-Heaviside
  • d. Sun spots

113. Sudden ionospheric disturbance

  • a. Solar flares
  • b. SIDs
  • c. Sun spots
  • d. Intertropical convergence

114. A means beyond the line of sight propagation of UHF signals.

  • a. Microwave propagation
  • b. Space wave propagation
  • c. Troposcatter propagation
  • d. Surface wave propagation

115. Two directional antennas are pointed so that their beams intersect in the troposphere.

  • a. Skywave
  • b. Surface wave
  • c. Microwave
  • d. Troposcatter

116. Super refraction.

  • a. Ducting
  • b. Trposcatter
  • c. Skywave
  • d. Space wave

117. A layer of warm air trapped above cooler air

  • a. Troposphere
  • b. SID
  • c. Duct
  • d. Huygen’s principle

118. Corresponds to voltage

  • a. Electric field
  • b. Magnetic field
  • c. Gyro
  • d. Direction of propagation

119. Absence of reception

  • a. Skip distance
  • b. Maximum usable
  • c. Shadow zone
  • d. Twilight zone

120. Each point in a spherical waveform maybe a source of a secondary spherical wavefront.

  • a. Senll’s law
  • b. Huygen’s principle
  • c. Rayleigh’s principle
  • d. De Morgan’s theorem

121. Ducting occurs in which region of the atmosphere?

  • a. Stratosphere
  • b. Troposphere
  • c. Ionosphere
  • d. Ozone layer

122. When is the E region most ionized?

  • a. At midday
  • b. At midnight
  • c. At duck
  • d. At dawn

123. Transequatorial propagation is best during

  • a. Night time
  • b. Afternoon or early evening
  • c. Noontime
  • d. Morning

124. Which of the following is most affected by knife-edge refraction?

  • a. Very high and ultra high frequencies
  • b. High frequencies
  • c. Medium frequency
  • d. Low frequency

125. Which ionosphere layer has an average height of 225 km at night?

  • a. D layer
  • b. E layer
  • c. F1 layer
  • d. F2 layer

126. A range of frequency little attenuated by the atmosphere is called

  • a. slide
  • b. door
  • c. window
  • d. frame

127. It is defined as either of two acute angles formed by the intersection of the two portions of the tropospheric scatter beam tangent to the earth’s surface.

  • a. critical angle
  • b. scatter angle
  • c. backscatter angle
  • d. sidescatter angle

128. It is a device that permits two different transmitters to operate with a single antenna.

  • a. duplexer
  • b. diplexer
  • c. isolator
  • d. circulator

129. It is a gradual shift in polarization of the signal in the medium.

  • a. fading
  • b. faraday effect
  • c. ghosting
  • d. multipath fading

130. A diversity scheme wherein the receiver receives two fading signals from two different directions.

  • a. frequency diversity
  • b. time diversity
  • c. angle diversity
  • d. space diversity

131. The radio wavelength known as _________ falls within the medium frequency range.

  • a. centimetric wave
  • b. decametric wave
  • c. hectometric wave
  • d. myriametric wave

132. The most dense of all ionized layer of the ionosphere

  • a. E
  • b. F1
  • c. F2
  • d. D

133. The frequency band used as sub-carriers, or signals which carry the baseband modulating information but in turn modulate another higher-frequency carrier is _________.

  • a. LF
  • b. MF
  • c. VLF
  • d. VH

134. The range of frequency band termed as super high frequency (SHF) is within _________.

  • a. 30 – 300 GHz
  • b. 30 – 300 MHz
  • c. 3 – 30 GHz
  • d. 300 – 3000 MHz

135. Electric field that lies in a plane perpendicular to the earth’s surface.

  • a. circular polarization
  • b. vertical polarization
  • c. horizontal polarization
  • d. elliptical polarization

136. The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization

  • a. is vertical
  • b. is horizontal
  • c. is circular
  • d. cannot be determined from the information given

137. The surface wave is effective only at frequencies below about _________ MHz.

  • a. 30
  • b. 3
  • c. 300
  • d. 0.3

138. What wave propagation are attenuated within a few miles?

  • a. space
  • b. sky
  • c. ground
  • d. direct

139. What happens to wave velocity as it passes from air to ionosphere?

  • a. increases
  • b. decreases
  • c. remain the same
  • d. not a factor

140. What wavelength radiations tend to be transmitted entirely between ionosphere and earth?

  • a. long
  • b. short
  • c. medium
  • d. millimeter

141. What effect do sunspots have on the ionosphere?

  • a. makes more rare and regular
  • b. makes more dense and irregular
  • c. makes less dense and regular
  • d. makes less dense and irregular

142. What is a double-hop signal?

  • a. ground, ionosphere, ground and back to ionosphere
  • b. ground, ground, ionosphere, and ionosphere
  • c. ionosphere, ionosphere, ground and ground
  • d. ionosphere, ground, ionosphere and back to ground

143. What is the major cause of fading?

  • a. phase difference
  • b. topographic variation
  • c. climate
  • d. ionosphere variation

144. Where is the skip zone?

  • a. between the sky and the first reflected wave
  • b. between end of ground and first reflected wave
  • c. between end of ground and farthest reflected wave
  • d. between the end of sky to the farthest reflected wave

145. What wave is the same day or night?

  • a. sky
  • b. space
  • c. direct
  • d. ground

146. Why do HF communications system shift frequencies at different times of day?

  • a. to take advantage of best reflected signals
  • b. to conserve the energy used
  • c. to create diversity
  • d. to improve noise performance

147. Scatter transmission is used at what frequencies?

  • a. EHF and VLF
  • b. HF and VHF
  • c. VHF and UHF
  • d. ELF and VLF

148. Over what areas ducts often form?

  • a. desert
  • b. water
  • c. forest
  • d. mountain

149. Polarization named for _________ component of the wave?

  • a. static
  • b. magnetic
  • c. direction
  • d. propagation

150. What polarization is employed in an AM broadcasting?

  • a. horizontal
  • b. parallel
  • c. transverse
  • d. vertical

Complete List of MCQs in Communications Engineering per topic

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