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Answer :

Antenna commonly used for microwave links are Paraboloidal dishes.

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Last Answer : Microwave links are preferred for TV transmission because They produce less phase distortion

Description : Part of a microwave link can be approximated by free space conditions. The antenna gain are each 40 dB, the frequency is 10 GHz, and the path length is 80 km. Calculate the receive power for a transmitted power of 10 W? A. 0.871 μW B. 871 μW C. 0.871 mW D. 871 nW

Last Answer : A. 0.871 μW

Description : What illumination factor is normally considered in computing parabolic antenna gain in microwave communications? A. 0.54 B. 0.65 C. 0.75 D. 0.85

Last Answer : A. 0.54

Description : Referred to as a ferrite device that can be used in lieu of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna. A. Isolator B. Circulator C. Coupler D. Diode.

Last Answer : B. Circulator

Description : The advantage of periscope antenna in microwave A. Minimize interference to and from other neighboring stations B. Shorten waveguide link C. Reduce tower height D. All of these

Last Answer : B. Shorten waveguide link

Description : It is a measure of the microwave power radiated from an antenna as a function of angular direction from the antenna axis. A. Antenna pattern B. Polarization C. Beamwidth D. Sidelobes

Last Answer : C. Beamwidth

Description : What are the commonly known food items not to cook/heat in a microwave?

Last Answer : Grapes create plasma bursts that can damage your microwave.

Description : Which of the following low noise transistors is commonly used at microwave frequencies? A. MOSFET B. GASFET C. MESFET D. JFET

Last Answer : C. MESFET

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Last Answer : A

Description :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Last Answer :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Description : In a microwave magic-T, E plane and H plane are  a) In phase b) Out of phase c) Isolated d) 90o out of phase

Last Answer : In a microwave magic-T, E plane and H plane are Isolated 

Description : Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise

Last Answer : Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise

Description : In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?  (1) To increase the sensitivity of measurement (2) To transmit the signal to a far-off place (3) To study amplitude modulation (4) Because crystal detector fails at microwave frequencies

Last Answer : In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?  Because crystal detector fails at microwave frequencies

Last Answer : Sometimes microwave signals follow the earth’s curvature. This due to Ducting.

Last Answer : Waveguide are used mainly for microwave signals because They would be too bulky at lower frequencies.

Description : This is a flexible vertical rod antenna commonly used on mobiles. A. Marconi B. Hertz C. Whip D. Ground plane

Last Answer : C. Whip

Description : An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Last Answer : An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

Description : For an earth station transmitter, with an antenna output power of 40dBW 10,000W, a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit ... effective isotropic radiated power (EIRP will be  a) 38dBW b) 40 dBW c 36 dBW d) 47 dBW

Last Answer : For an earth station transmitter, with an antenna output power of 40dBW 10,000W, a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated power (EIRP will be 38dBW

Description : The directive gain of an antenna: (1) is less than or equal to 1 (2) is greater than or equal to 1 (3) lies between 0 and directivity of antenna (4) is greater than directivity of antenna

Last Answer : The directive gain of an antenna: lies between 0 and directivity of antenna

Description : Adaptive array antenna is superior to switched beam antenna because: (A) It optimizes the power radiated (B) It has simpler architecture (C) It has low bandwidth (D) It has low backlobe

Last Answer : Adaptive array antenna is superior to switched beam antenna because: It optimizes the power radiated

Description : The line of sight communication requires transmit and receive antenna to face each other. If the transmit antenna is vertically polarized, for the best reception the receive antenna should be:  ... 45° with respect to the horizontal polarization (4) At 45° with respect to the vertical polarization

Last Answer : The line of sight communication requires transmit and receive antenna to face each other. If the transmit antenna is vertically polarized, for the best reception the receive antenna should be:  Horizontally polarized.

Last Answer : In any transmitting antenna system, efficiency primarily depends upon radiation resistance.

Last Answer :  Ground plane antenna are used for VHF

Last Answer : A helical antenna is used for satellite tracking because of its Circular polarization

Last Answer : The number of parasitic elements in yagi antenna is 2.

Last Answer : Electrical length of an antenna is Greater than physical length.

Last Answer : Yagi antenna has Driven antenna, reflector and directors.

Last Answer : Yagi antenna contains Dipole, one reflector and many directors.

Last Answer : Television receiver antenna is usually Yagi antenna.

Description : Which valve is most commonly used for throttling service? (A) glove valve (B) needle valve (C) ball valve

Last Answer : Which valve is most commonly used for throttling service?  glove valve

Last Answer :  The most commonly used transistor circuit arrangement Common emitter