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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
In C-E configuration an emitter resistor is used for?
In a common-emitter (C-E) configuration, an emitter resistor is used primarily to provide temperature stability and improve linearity of the amplifier. It helps to stabilize the operating point by reducing the effects of temperature variations and transistor beta fluctuations. Additionally, the emitter resistor introduces negative feedback, which enhances linearity and bandwidth while reducing distortion. However, it also reduces the overall voltage gain of the amplifier.
What is the connection of PNP to DILG?
The Philippine National Police (PNP) operates under the Department of the Interior and Local Government (DILG). The DILG oversees the PNP's policies, governance, and overall direction, ensuring that law enforcement aligns with national objectives. This relationship allows the DILG to manage local government units and coordinate public safety efforts through the PNP. Essentially, the DILG provides the framework for the PNP's operations and accountability in maintaining peace and order.
Where does the intelligence reside in a PWM signal?
The intelligence in a Pulse Width Modulation (PWM) signal resides in the duty cycle, which is the ratio of the "on" time to the total period of the signal. By varying the duty cycle, the effective voltage and power delivered to a load can be controlled, allowing for tasks like motor speed control or LED brightness adjustment. The frequency of the PWM signal is also important, as it determines how quickly the changes occur and can affect the response of the system being controlled.
In the early 70s, making large resistors was expensive in silicon area. The diffusion used to make the bases of NPN transistors had the highest resistance per silicon area. When making NPN transistors, the emitter is diffused over the top of a base region. The resistance in this sub-surface base region which is "pinched" between an N doped epi collector below it and a N doped emitter region above it can have 10 times the normal base resistance. It was often used in non critical applications to save on silicon die size.
How do microwaves disperse during path loss between communication towers?
Because of the wave nature of electromagnetic waves, it's impossible to radiate
them from a 'launching structure' that has finite dimensions, and expect them
not to spread wider as they proceed over a great distance. So we must picture
any electromagnetic transmission ... whether it's light, radio, radar, microwave,
X-ray, etc. ... as a cone of energy as it proceeds from the transmitter, beginning
with a small cross-section as it leaves the launcher, and growing wider and wider
as it proceeds.
Realizing this, we now have a constant, fixed amount of power, propagating
across a surface area that gets bigger and bigger as we move farther and
farther from the source. So for a receiving antenna of any given size, it makes
sense that the farther the receiver is from the source, the less signal power
it's able to intercept, since that power is spread over a progressively larger
area as the distance increases.
People will also hasten to mention that there are many things all around in
the natural environment that absorb power from the signal, such as trees,
buildings, atmosphere, rain, clouds, soil, etc. They are correct, but these losses
are only a very small part of the weakening of microwave signals with distance.
By far the greatest factor is the geometric spreading with distance, described
above.
If the wire length is 100m and the Diameter is 1mm calculate the Resistance of wire?
Can a power signal be an energy signal?
a signal can never be both energy & power signal because they are mutually exclusive
What is E representing on Resistor value?
The unit for measuring resistance is the Ohm, which usually uses the Greek letter Omega. In circuit diagrams, the Omega is often left out and the metric prefix is used instead (k for kilo-ohm, M for mega-ohm). The letter E is used to represent ohms (ex. 120E = 120 ohms, 1E2 = 1.2 ohms).
It is not "transfer". it has to be " Transverse" wave.
When the particles of the medium does vibrations simple harmonically perpendicular to the direction of motion of the wave then it is said to be transverse wave.
Even electromagnetic wave too is a transverse wave as its electric and magnetic omponents are normal to the direction of propagation.
How do you earth in the 1600 kva transformer?
In 1600 kva transformer we provide NGR (Neutral grounding resistance)
What is the consequence of using DC as input in a transformer?
Basically, Transformers use magnetic energy to transmit a signal (voltage or current) from its primary to secondary. So there needs to be a magnetic flux associated with it. As we know, alternating current produces a variable flux and it causes an emf change in the secondary winding. But direct currents produce a constant magnetic flux which does not help to build up emf in the secondary. Another disadvantage is that there would be no self induced emf in the primary which opposes the changing current (in case of alternating currents) according to Lenz's law. So, the primary winding may burn out due to heavy constant current and its low input resistance.
Is 433 MHz a license free RF band in India?
Apparently not. See
http://www.wpc.dot.gov.in/faq.asp#3
What are the license- free bands?
433 MHz is not listed there.
What is difference between frequency and slip frequency?
Both 3-phase induction motors and single-phase induction motors have rotating magnetic fields assuming that the single-phase motor has one of the usual starting mechanisms built-in.
The synchronous speed is given by RPM = 120 X f / p where f is the frequency and p is the number of poles.
The conductors in the rotor pass through the magnetic field of the stator at the slip speed. As a result an alternating current is generated in the rotor. The frequency of that current is the rotor frequency or slip frequency given by slip frequency = slip speed X p / 120.
At full load, the slip speed of a standard, 3-phase motor is about 1% to 2.5% of synchronous speed. A motor with 6% slip would be classified as a high-slip motor. The slip of a standard single-phase motor could be 6%.
Resonant frequencies higher than the lowest resonant frequency of a standing wave are called?
In physics the term harmonics is usually used. Note that the lowest-frequency mode also counts as a harmonic: it is simply the first one.
True.
A band-limited signal is one in which the Fourier transform is zero above a certain frequency. In other words it's a signal that ahas a finite frequency content. The simplest case is a pure sinusoidal signal, whose Fourier transform consists of a delta function centred on the frequency of the signal. A band-limited signal can be reconstructed exactly if it is sampled at at more than twice the maximum frequency present in the signal.
A time-limited signal is a signal that is zero above a finite. An example of this would be a short pulse.
The reason a signal cannot be both band-limited or time-limited is due to their relationship via the Fourier transform. One can show it is impossible for the Fourier transform of a signal with compact support ie either time or band-limited, to also have compact support. A time-limited signal must have a continuous frequency spectrum existing over all possible frequencies and a band-limited signal can only arise from signal existing for all time. Note this indicates in reality it is impossible to have a truly band-limited signal as it would take infinite time to transmit, but it is nonetheless a useful concept and we can produce nearly band-limited signal to a high degree of accuracy.
What guidance defines and describes the IC markings system?
The Intelligence Community (IC) markings system is defined and described primarily in the Intelligence Community Directive (ICD) 703, which provides policies for the classification, safeguarding, and dissemination of national intelligence. This guidance outlines how to properly mark classified information, including the use of specific symbols and indicators to signify sensitivity levels and handling instructions. The system ensures consistent and secure communication of classified materials across different agencies within the IC. Additionally, it emphasizes the importance of protecting sensitive information while facilitating appropriate access for authorized personnel.
