Below are the answers key for the Multiple Choice Questions in Microwave Communications Part 3.

101. 142.55 dB

102. Baseband repeater

103. More

104. 0.6

105. Infinity

106. 9.7 nmi

107. Antenna directivity

108. 0.013 %

109. Speed

110. Frequency

111. Magnetron

112. Gunn diode

113. Spark gap

114. Horn and parabolic reflector

115. PPI

116. Phased array

117. 10 GHz

118. The distances involve are grater

119. Waveguides

120. K-band

121. 92.4 + 20 log f + 20 log d

122. High pass filter

123. Frequency diversity

124. Litz wire

125. Antennas operating on the same frequencies

126. Frequency diversity

127. Flattening

128. Electron gun, helix and collector

129. Shorten waveguide length

130. The lowest frequency the waveguide operates

131. Decreased

132. Greater than in free space

133. 54

134. 183 GHz

135. 60 GHz

136. Attenuation due to water vapor and oxygen

137. 12.78

138. Terrestrial

139. Prevent oscillation

140. Space diversity

141. K x 4000 miles

142. Pulse width

143. Electronic Altitude and Director Indicator

144. DME

145. 43500 MHz

146. Terrestrial Flight Telephone System

147. Automatic Direction Finder

148. 1300

149. Wide bandwidth

150. Radio Detection and Ranging

#### Questions and Answers in Microwave Communications and Principles Series

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

**MCQ in Microwave Communications**

**MCQ from Number 1 – 50**Answer key:

**PART 1**

**MCQ from Number 51 – 100**Answer key:

**PART 2**

**MCQ from Number 101 – 150**Answer key:

**PART 3**

**MCQ from Number 151 – 200**Answer key:

**PART 4**

**MCQ from Number 201 – 250**Answer key:

**PART 5**

**MCQ from Number 251 – 300**Answer key:

**PART 6**

**MCQ from Number 301 – 350**Answer key:

**PART 7**

**MCQ from Number 351 – 400**Answer key:

**PART 8**

**MCQs from Number 401 – 450**Answer key:

**PART 9**

**MCQs from Number 451 – 500**Answer key:

**PART 10**

### Complete List of MCQ in Communications Engineering per topic