Microwave Communication — Part 1 MCQs with Explanations

All of the above is the correct answer to “Coupling into and out of a traveling-wave tube can be accompanied by a”. This question is standard in competitive examination syllabi for Microwave Communication.

The shortest possible time is the correct answer to “When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have”. This question is standard in competitive examination syllabi for Microwave Communication.

$${\text{S}} = \frac{{3\lambda {\text{R}}}}{{\text{L}}}$$ is the correct answer to “The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from: where R = effective earth radius (m) and L = path length (m)”. This question is standard in competitive examination syllabi for Microwave Communication.

As a second anode and to prevent the build-up of secondary field is the correct answer to “The aquadag coating on the inside of PPI tube is used”. This question is standard in competitive examination syllabi for Microwave Communication.

Ferrite emitter is the correct answer to “What allow microwave to pass in only one direction”. This question is standard in competitive examination syllabi for Microwave Communication.

$$\pi $$ mode is the correct answer to “If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the”. This question is standard in competitive examination syllabi for Microwave Communication.

By bunches of electrons passing the cavity grids is the correct answer to “Oscillators of a klystron tube are maintained”. This question is standard in competitive examination syllabi for Microwave Communication.

Indicates both the range and azimuth of a target is the correct answer to “A PPI cathode-ray tube as used on a radar set”. This question is standard in competitive examination syllabi for Microwave Communication.

All of these is the correct answer to “It is possible to increase the maximum range of a radar equipment by”. This question is standard in competitive examination syllabi for Microwave Communication.

Magnetron is the correct answer to “A high-power microwave pulse of the order of megawatts can be generated by a”. This question is standard in competitive examination syllabi for Microwave Communication.

SONAR is the correct answer to “A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.”. This question is standard in competitive examination syllabi for Microwave Communication.

10 GHz is the correct answer to “Rainfall is an important factor for fading of radio waves at frequencies above”. This question is standard in competitive examination syllabi for Microwave Communication.

Reduce interference from the effects of sea return is the correct answer to “In a pulsed radar set, the STC circuit is used to”. This question is standard in competitive examination syllabi for Microwave Communication.

Large reflector is the correct answer to “Which causes multipath or frequency selective fading”. This question is standard in competitive examination syllabi for Microwave Communication.

Towards the earth is the correct answer to “If k-factor is greater than 1, the array beam is bent”. This question is standard in competitive examination syllabi for Microwave Communication.

3000 to 30000 MHz is the correct answer to “Klystron oscillators are most often used in the frequency range of”. This question is standard in competitive examination syllabi for Microwave Communication.

Isolator is the correct answer to “Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction”. This question is standard in competitive examination syllabi for Microwave Communication.

Its resonant cavity is the correct answer to “The main frequency determining element of a klystron is”. This question is standard in competitive examination syllabi for Microwave Communication.

Velocity modulation at the input cavity creates density modulation at the output cavity is the correct answer to “As the electron beam moves through a klystron’s intercavity drift space”. This question is standard in competitive examination syllabi for Microwave Communication.

Allow the transmitter and the receiver to operate from a common antenna is the correct answer to “In a pulsed radar set, the function of the duplexer is to”. This question is standard in competitive examination syllabi for Microwave Communication.

Slow fading is the correct answer to “What do you call an attenuation that occurs over many different wavelengths of the carrier”. This question is standard in competitive examination syllabi for Microwave Communication.

1 to 100 GHz is the correct answer to “Microwave frequencies are normally regarded as those in the range of”. This question is standard in competitive examination syllabi for Microwave Communication.

Both B and C is the correct answer to “Which of the following is used as an oscillator device in the SHF band”. This question is standard in competitive examination syllabi for Microwave Communication.

Magnetron is the correct answer to “Which of the following is used as a high power microwave oscillator”. This question is standard in competitive examination syllabi for Microwave Communication.

Attenuation is the correct answer to “__________ is the progressive decrease of signal strength with increasing distance.”. This question is standard in competitive examination syllabi for Microwave Communication.

100 watts is the correct answer to “A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is”. This question is standard in competitive examination syllabi for Microwave Communication.

May be decreased is the correct answer to “If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers”. This question is standard in competitive examination syllabi for Microwave Communication.

The dimension of each cavity resonator is the correct answer to “The frequency of the oscillation generated by a magnetron, is mainly determined by”. This question is standard in competitive examination syllabi for Microwave Communication.

Which may be used to tune the radar receiver is the correct answer to “When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.”. This question is standard in competitive examination syllabi for Microwave Communication.

Adjusting the flexible wall of the resonant cavity is the correct answer to “The coarse frequency adjustment of a reflex klystron is accomplished by”. This question is standard in competitive examination syllabi for Microwave Communication.

Loran C: 100 kHz is the correct answer to “Which of the following operating frequencies is used for the modern loran navigational system”. This question is standard in competitive examination syllabi for Microwave Communication.

The interval between transmitted pulses is the correct answer to “The maximum usable range of the usual radar set (on any particular range setting) is determined by”. This question is standard in competitive examination syllabi for Microwave Communication.

All of these is the correct answer to “A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)”. This question is standard in competitive examination syllabi for Microwave Communication.

No noticeable effect is the correct answer to “A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be”. This question is standard in competitive examination syllabi for Microwave Communication.

Slow fading is the correct answer to “Which of the reception problems below that is not due to multipath”. This question is standard in competitive examination syllabi for Microwave Communication.

The absorption of energy by the signal from an electron stream is the correct answer to “A traveling-wave tube (TWT) amplifies by virtue of”. This question is standard in competitive examination syllabi for Microwave Communication.

8493 km is the correct answer to “Calculate the effective earth’s radius if the surface refractivity is 301.”. This question is standard in competitive examination syllabi for Microwave Communication.

Local oscillator is the correct answer to “In an SHF pulsed radar set, a reflex klystron can be used as a”. This question is standard in competitive examination syllabi for Microwave Communication.

A narrow, antenna-beam width in the horizontal plane is the correct answer to “To achieve good bearing resolution when using a pulsed-radar set, an important requirement is”. This question is standard in competitive examination syllabi for Microwave Communication.

Degree of emission from the cathode is the correct answer to “The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the”. This question is standard in competitive examination syllabi for Microwave Communication.