POC
Electromagnetic Field Quiz
Test your knowledge on electromagnetic fields, antenna types, and radio wave propagation with our comprehensive quiz. This quiz covers a wide range of topics from the basics to advanced concepts in antenna theory and electromagnetic principles.
- 41 well-crafted questions
- Multiple choice and checkbox formats
- Engaging and educational experience
Made up of both electric and magnetic fields
Electric Field
Magnetic Field
Radio Waves
Electro magnetic field
Generated around a conductor when current flows through it
Antenna
Electric Field
Magnetic Field
Antenna beamwidth
Also an invisible force field produced by the presence of a potential difference between two conductors.
Magnetic field
Electric field
Radio wave
Antenna
The direction of current flow in one wire is always not opposite that in the other wire, therefore the magnetic fields will not combine.
True
False
is the dielectric constant of the material between two conductors
Directivity
Permittivity
Polarization
Near Field
acts as the interface between a transmitter or receiver and free space.
Antenna
Conductor
Voltage
Capacitor
In any given time, the wires have opposite polarities.
True
False
These fields are not radio wave, but they do contain any information transmitted.
Far field
Near field
Antenna beamwidth
Antenna bandwidth
Means that the characteristics and performance of an antenna are the same whether the antenna is radiating or intercepting an electromagnetic signal.
Antenna beamwidth
Antenna bandwidth
Far field
Antenna reciprocity
These fields weaken with the distance from the antenna, approximately by the quadruple power of the distance.
Near Field
Far field
Antenna reciprocity
Antenna bandwidth
Defined as the frequency range over which antenna operation is “satisfactory”.
Antenna beamwidth
Antenna bandwidth
Antenna reciprocity
Near field
An omnidirectional antenna radiates equally well in all directions.
True
False
A directional antenna eliminates interference from other signals being received from all directions other than the direction of the desired signal.
True
False
Refers to the ability of an antenna to send or receive signals over a narrow horizontal directional range.
Polarization
Magnetic field
Directivity
Permittivity
Some antennas produce horizontal polarization in which the electric and magnetic fields rotate as they leave the antenna.
True
False
Refers to the orientation of magnetic and electric fields with respect to the earth.
Directivity
Permittivity
Polarization
Antenna Bandwidth
Also formally known as the Hertz antenna.
Marconi Antenna
Dipole Antenna
Parabolic reflector antenna
Yagi-uda antenna
A very simple antenna which has uniform radiation in all directions is formed by a single vertical element insulated from ground The incoming signal is mixed with a local oscillator signal to produce the conversion.
Marconi Antenna
Parabolic Reflector antenna
Yagi-uda antenna
Dipole antenna
Is two pieces of wire, rod, or tubing that are one-quarter wavelength long at the operating resonant frequency.
Marconi Antenna
Parabolic Reflector antenna
Yagi-uda antenna
Dipole antenna
Widely used antenna that commonly uses a folded dipole as the driven element.
Dipole antenna
Marconi Antenna
Parabolic Reflector antenna
Yagi-uda antenna
All metallic objects reflect radio waves, especially if the metallic object is at least one-half wavelength at the frequency of operation.
Diffraction
Reflection
Refraction
Permittivity
Provides extremely high gain and directivity and are very popular for microwave radio and satellite communication links.
Yagi-uda antenna
Marconi Antenna
Dipole antenna
Parabolic Reflector antenna
Angle of incidence is the angle between the incoming line of the wave and a perpendicular line to the reflecting surface.
True
False
Angle of adjacent is the angle between the reflected wave and the perpendicular line.
True
False
Is the bending of a wave due to the physical makeup of the medium through which the wave passes
Refraction
Diffraction
Reflection
Polarization
The speed of a radio wave, like the speed of light is approximately 500,000,000 m/s (186,400 mi/s) in free space, I.e., in a vacuum or air.
True
False
Pulse modulation is consists essentially of sampling analog information signals and then converting those samples into discrete pulses and transporting the pulses from a source to a destination over a physical transmission medium.
True
False
If an obstacle appears between a transmitter and receiver, some of the signal is blocked, creating what is known as a shadow zone.
Diffraction
Refraction
Reflection
Antenna
What are the disadvantages of digital transmission
Digital transmission systems are incompatible with older analog transmission systems.
Better suited than analog signals for processing and combining.
Transmission errors can be detected and corrected more easily and more accurately than analog signals.
Analog signals must be converted to digital pulses prior to transmission and converted back to their original analog form at the receiver.
The process of changing a binary pulse signal to represent the information to be transmitted.
Pulse modulation
Frequency modulation
Digital transmission
Digital Signal
What are the advantages of digital transmission
Less susceptible than analog signals to interference caused by noise, for the reason that pulses in a digital transmission are evaluated during a precise time interval.
Can be transported longer distances than analog signals.
The transmission of digitally encoded analog signals requires significantly more bandwidth than simply transmitting the original analog signal.
More resistant to analog systems to additive noise due to signal regeneration.
Pulses are then sent by either wire or cable, or else are used to modulate a carrier.
PAM
PWM
PPM
PCM
Pulses are of fixed length and fixed amplitude.
PAM
PCM
PPM
PWM
Requires larger bandwidth compared to PAM.
PAM
PCM
PPM
PWM
Bandwidth required for the transmission is very large in comparison to the maximum frequency present in the modulating signal.
PWM
PPM
PAM
PCM
Amplitude and width of the pulses is kept constant in this system.
PPM
PAM
PWM
PCM
Width of each pulse is made proportional to the amplitude of the signal at that instant.
PPM
PCM
PAM
PWM
Transmission power of each pulse is same because of its constant pulse widths and amplitudes.
PAM
PPM
PCM
PWM
The most widely used technique for digitizing information signals for electronic data transmission.
PCM
PAM
PPM
PWM
Parallel binary output is converted to a serial signal by a digital shifter.
True
False
Each time a sample is taken, an 16 bit word is generated by the A/D converter.
True
False
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