Online Questions and Answers Topic Outline
- MCQs in Basic Principles of Microwave Communications
- MCQs in Electro-Optics
- MCQs in Photonics
- MCQs in Optoelectronics
- MCQs in Electromagnetics
- MCQs in Avionics, Aerospace, Navigational and Military Applications
- MCQs in Medical Electronics
- MCQs in Cybernetics
- MCQs in Biometrics
MCQs in Microwave Communications and Principles Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part III of the Series
101. The free space attenuation between two microwave antennas 40 km apart operating at 8 GHz is
- A. 146.7 dB
- B. 142.55 dB
- C. 82.5 dB
- D. 86.7 dB
102. An active microwave radio repeater that can provide drops and inserts.
- A. Broadband repeater
- B. Baseband repeater
- C. IF repeater
- D. RF repeater
103. If the correction factor k equals 4/3 of the earth’s curvature, the microwave beam would have a curvature that is ___________ than that of the earth.
- A. More
- B. Less
- C. Equal
- D. Not related
104. The optimum clearance from an obstacle in an microwave system is accepted as __________ of the first fresnel zone radius.
- A. 0.6
- B. 0.5
- C. 0.9
- D. 1.5
105. The microwave beam curves the same than that of the earth when the value of the correction factor k equals
- A. 0
- B. 4/3
- C. 2/3
- D. Infinity
106. The time from the transmission of a radar pulse to its reception is 0.12 ms. The distance to the target is how many nautical miles?
- A. 4.85 nmi
- B. 9.7 nmi
- C. 11.2 nmi
- D. 18.4 nmi
107. The ability of a radar to determine the bearing to a target depends upon the
- A. Antenna directivity
- B. Speed of light
- C. Speed of the target
- D. Frequency of the signal
108. The pulse duration of a radar signal is 699ns. The PRF is 185 pulses per second. The duty cycle is
- A. 0.216 %
- B. 0.130 %
- C. 0.013 %
- D. 0.407 %
109. The Doppler effect allows which characteristics of a target to be measured?
- A. Distance
- B. Azimuth
- C. Altitude
- D. Speed
110. The Doppler effect is a change in what signal characteristics produced by relative motion between the radar set and a target?
- A. Amplitude
- B. Phase
- C. Frequency
- D. Duty cycle
111. The most widely used radar transmitter component is a
- A. Klystron
- B. Magnetron
- C. TWT
- D. Power transistor
112. Low-power radar transmitters and receivers use which component?
- A. GaAs FET
- B. Magnetron
- C. Gunn diode
- D. Klystron
113. What component in a duplexer protects the receiver from the higher transmitter output?
- A. Waveguide
- B. Bandpass filter
- C. Notch filter
- D. Spark gap
114. Most radar antennas use a
- A. Dipole
- B. Broadside array
- C. Horn and parabolic reflector
- D. Collinear array
115. The most common radar display is the
- A. A scan
- B. Color CRT
- C. LCD
- D. PPI
116. A radar antenna using multiple diploes or slot antennas in a matrix with variable phase shifters is called a/an
- A. A scan
- B. Phased array
- C. Broadside
- D. Circulator polarized array
117. Which of the following is a typical radar operating frequency?
- A. 60 MHz
- B. 450 MHz
- C. 900 MHz
- D. 10 GHz
118. A microwave system requires the use of repeaters when
- A. The intervening terrain is favorable
- B. The distances involve are grater
- C. The required reliability is meet
- D. The radio fading is unacceptable
119. Are transmission lines which convey electromagnetic waves in highest frequencies
- A. Twister pair of telephone wires
- B. Waveguides
- C. Power lines
- D. Coaxial cables
120. A microwave band of 10.9 to 36. GHz is considered as
- A. C-band
- B. X-band
- C. Q-band
- D. K-band
121. A microwave communications system space loss calculation formula.
- A. 94.2 + 20 log f + 20 log d
- B. 92.4 + 20 log f + 20 log d
- C. 94.2 + 10 log f + 20 log d
- D. 92.3 + 10 log f + 20 log d
122. A waveguide is also a
- A. Low pass filter
- B. High pass filter
- C. Band pass filter
- D. Band stop filter
123. A method of diversity reception where the signal is transmitted on two difference frequencies over the same path
- A. Space diversity
- B. Frequency diversity
- C. Polarization diversity
- D. Wavelength diversity
124. A wire used to reduce the skin effect
- A. AWG # 14
- B. AWG # 15
- C. Copper wire
- D. Litz wire
125. Space diversity transmission means transmitting and receiving on two or more.
- A. Different frequencies
- B. Antennas operating on two different frequencies
- C. Antennas operating on the same frequencies
- D. Identical frequencies
126. The best system configuration to overcome multipath fading of microwave system over the water
- A. Space diversity
- B. Frequency diversity
- C. Polarization diversity
- D. Wavelength diversity
127. When the value of k increases, the effective result is _______ of the equivalent curvature
- A. Flattening
- B. Bulging
- C. Sharp curvature
- D. All of these
128. A traveling wave tube consists of
- A. Electron gun, helix and repeller
- B. Electron gun, helix and collector
- C. Electron gun, repeller and collector
- D. Buncher cavity and catcher cavity
129. Advantage of periscope antenna in microwave
- A. Reduce tower height
- B. Minimize interference to and from other neighboring stations
- C. Shorten waveguide length
- D. Easy to install
130. What is the cut-off frequency of a waveguide?
- A. The highest frequency the waveguide operates
- B. The lowest frequency the waveguide operates
- C. The same as the operating frequency
- D. The only frequency the waveguide operates.
131. When the clearance above the obstruction is equal to the radii of even fresnel zones at the point of reflection. The RSL is
- A. Increased
- B. Decreased
- C. Constant
- D. Above threshold
132. What is the wavelength of a wave in a waveguide?
- A. Greater than in free space
- B. Depends only on the waveguide dimensions and the free-space wavelength
- C. Inversely proportional to the phase velocity
- D. Inversely proportional to the group velocity
133. The CCIR hypothetical reference circuit covering a distance of 25000 km consists of a total of how many hops?
- A. 5
- B. 10
- C. 24
- D. 54
134. Water causes more attenuation particularly on what frequency?
- A. 20 GHz
- B. 63 GHz
- C. 183 GHz
- D. 202 GHz
135. At what frequency does oxygen cause excessive attenuation?
- A. 60 GHz
- B. 50 GHz
- C. 40 GHz
- D. 30 GHz
136. Which of the following is an atmospheric attenuation?
- A. Attenuation due to water vapor and oxygen
- B. Attenuation due to mist and fog
- C. Attenuation due to other gases
- D. Attenuation due to rain.
137. A microwave system operating at the 6 GHz band is carrying 600 voice channels. What is the noise loading power in dBmO?
- A. 12.78
- B. 26.78
- C. 27.78
- D. 10.25
138. _________ is a microwave link between the down-town terminal and another out of town terminal.
- A. STL
- B. Uplink
- C. Downlink
- D. Terrestrial
139. Attenuator is used in the traveling wave tube to
- A. Prevent oscillation
- B. Increase gain
- C. Prevent saturation
- D. All of these
140. Is a method of diversity reception applied to reflective path to reduce fading.
- A. Frequency diversity
- B. Space diversity
- C. Polarization diversity
- D. Wavelength diversity
141. What is the effective earth’s radius used in communications design?
- A. 4000 miles
- B. K x 4000 miles
- C. 5000 miles
- D. K x 5280 miles
142. IF bandwidth of a radar system is inversely proportional to
- A. Pulse width
- B. Pulse interval
- C. Peak transmit power
- D. All of these
143. EADI stands for
- A. Electronic Air Data Indicator
- B. Electronic Altitude and Distance Indicator
- C. Electronic Altitude and Director Indicator
- D. Electronic Air and Distance Indicator
144. Which aircraft navigational system determines the time to station (TTS) or time to go (TTG)?
- A. ADF
- B. DME
- C. Timer
- D. ATC
145. What frequency does a radio altimeter operate?
- A. 33500 kHz
- B. 43000 kHz
- C. 33500 MHz
- D. 43500 MHz
146. What inflight system allows passengers to make telephone calls, send faxes, and computer data shop and play computer games, etc.?
- A. Inflight Satellite System
- B. Terrestrial Flight Telephone System
- C. World Airline Entertainment System
- D. Satellite Phone
147. ADF stands for
- A. Audio Direction Findings
- B. Automatic Direction Finder
- C. Alternate Direction Finder
- D. Automatic Distance Finder
148. RF carrier of the middle marker is modulated at ____ Hz.
- A. 1300
- B. 1400
- C. 1500
- D. 1600
149. Which of the following is considered as the major advantage of using a helix traveling wave tube?
- A. Cheaper
- B. Less noise
- C. High power
- D. Wide bandwidth
150. RADAR stands for
- A. Radio Distance and Ranging
- B. Radio Detection and Ranging
- C. Radio Direction and Ranging
- D. Radio Distance and Range
Post a Comment
Sir,till 150 its ok...but i can't open 151-200.
the series is not yet finish, I'll be adding soon.