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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
Why Kirchhoffs current law and Kirchhoffs voltage law cannot apply on distributed circuits?
Actually, they do apply.
Kirchoff's Current Law states that the signed sum of the currents entering a node is zero. This applies whether the node has only two connections, such as in a series cicuit, or more than two connections, such as in a parallel circuit. Some people confuse this with the rule that current at every point in a series circuit is the same. That is just a special case of KCL, but the real rule has to do with the node, and not the circuit.
Kirchoff's Voltage Law states that the signed sum of the voltage drops going around a series circuit is zero. This applies for simple series circuits as well as for complex series/parallel circuits. Pick any loop in a circuit and walk around it - you will find that the signed sum of the voltage drops is zero, no matter what.
The 7400, and its variations, is a quad two input NAND gate.
Types of Negative feedback amplifier?
voltage amplifier feedback
current amplifier feedback
transconductance feedback
transresistance feedback
What is back charging of power transformer?
Do you mean "back-feeding"?
Normally a power transformer takes a primary voltage and steps it up or down (usually down) to a secondary voltage. However, transformers are symmetrical; you can just as easily feed the secondary and generate the primary voltage.
This is particularly a problem with utility power distribution systems in a storm, such as a hurricane situation...
In a protracted power outage, some people are tempted to run backup generators to supply their inhouse loads while the utility company is effecting repairs. An intelligent user, one that reads the directions, will isolate the generator from the service distribution system so that it is impossible to back feed the service source.
Some people might ignore the directions and attempt to back feed their entire home. If they don't isolate the incoming mains breaker, this can back feed the distribution transformer and energize the primary line on the street, raising it to high voltage, such as 7620 volts.
This actually happened during Hurricane Gloria in 1985, and a utility worker was killed. Yes, the worker was at fault for assuming that the line was dead, but the homeowner was also at fault for ignoring the directions that came with the generator.
Unless you have the proper equipment to synchronize, backfeed, and isolate your generator, DO NOT EVER DO THIS.
What is the meaning of LM in LM 555 IC?
It's a prefix of the IC products of 'Linear Monolithic' category of National semiconductors.
What are the main parts of CRO?
1. Electron Gun
2. Focusing system
3. Deflection system
4. Fluorescent screen
The positive terminal of the battery would be connected to the positive terminal of the ammeter. The load would then be connected between the two negative terminals, positive side of the load being connected to the negative side of the ammeter.
What is the effective voltage for a peak voltage of 311 volts?
When the peak voltage is 311, the RMS voltage is 220. (311 * square root (2))
What is minimum and maximum segment size in 8086?
In 8086 microprocessor the total memory addressing capability is 1 mega bytes. For representing 1 mb there are minimum 4 hex digits are required i.e, 20 bits. but 8086 has fourteen 16-bit registers. That is there are no registers for representing 20 bit address. So,the total memory is divided into 16 logical segments and each segment capacity is 64 kb(kilo bytes). That is 16*64kb=1 mb.So,for representing 64 kb only 16 bit register is sufficient.
0.01 mA is 0.00001 A. This is the current required to develop a voltage of 0.01 mV across 1 Ohm. Since it is a series circuit, it is also true that the current on 0.01 mA is present at every point in the circuit.
Why to short circuit capacitor in small signal analysis of BJT?
if the input signal passes through the biasing resistors, the biasing conditions get altered . To prevent this, the input signal should be directly sent to the amplifier (BJT) .Since a capacitor acts as a short circuit for ac signals,capacitors are placed both in the input side and the output side.
Is resistance box connected in series or parallel?
It depends on what you want to accomplish. If you want to decrease the resistance in a circuit, you would place the box in parallel to some other resistor. If you want to increase the resistance in a circuit, you would place the box in series.
How do you control PN-junction?
When a pn junction is direct polarized, the height of the depletion layer is reduced and majority charge carriers now have sufficient energy to cross the junction and when it is revers polarized the height of the depletion layer is increased and the number of majority charge with sufficient energy to cross the junction is cut sharply.
What feedback is used in amplifier?
there are four types of feedback connetion. the one used is that which amplifies your input (Positive feedback).
When soldering a replacement fitting in a refrigeration circuit it is important that?
You take into consideration the type of refrigerant used in the system.
Can you replace a capacitor that is smaller in size but same value?
If, by smaller in size, you mean physical size, then yes. You just need to keep the same capacitance and minimum voltage rating. Also, in a power supply filter application, you need to consider the maximum RMS current rating.
Incorrectly calibrated meters.
How do you calculate minimum clock period in a digital circuit?
If you have the Maximum clock frequency, then you can figure out the minimum clock period using this formula: 1/(minimum clock period) = (Maximum clock frequency).
Why is the capacitor used in tube light?
Starters in tube light uses capacitors to produce a momentary high voltage of 400V due to discharging of capacitor.
This momentary high voltage will start the gaseous discharge to priduce light by initial flickering .
now,if capacitor is not used , the power supply from the main cannot start the gaseous discharge .
Why analog circuit has much noise than digital circuit?
Data regeneration is not possible in analog circuits.Signals has degeneration and distortion so it causes noise.But in digital circuit signals are quantizated and regenerated even if they had corruption.
