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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
What is the relationship between channel width and drain current?
if channel width decreases , the drain current(Id) will also decrease .
but , Id will decrease up to a certain limit , when the jfet is in pinch off condition i.e. channel width is tends to zero (Vgs is very high) the Id will be constant then.
A tap changer is used to vary the turns ration between the windings of a transformer to make minor changes to the secondary voltage. An on-load tap changer enables the turns ratio to be altered without disconnecting the transformer. An off-load tap changer requires the transformer to be temporarily diconnected. On-load tap changers are installed on the high-voltage side of the transformer, where the current is lower.
What is the interlace in pole and zero?
its nothing but alternate occurence of pole/zero and zero/pole. ex: f(s)=s*(s+2)/(s+1). here we can easily sense that there is a occurence of zero(s=0),pole(s=-1),zero(s=-2).
Why current flow from cathode to anode in zener diode?
First off, I don't know if by current flow you mean conventional current flow or electron current flow. You realize they are in opposite directions and most electronics engineers use conventional current flow in circuit analysis.
Ignoring this, I will assume your real question is "Why does current flow backwards in zener diodes compared to ordinary diodes?" The answer is that zener diodes are not operated in the forward biased range as are ordinary diodes, instead they are operated in the reverse biased range. When reverse biased enough any diode reaches breakdown voltage and suddenly conducts. Most ordinary diodes can be destroyed by breakdown, but zener diodes are designed to tolerate it. In zener diodes, this breakdown is referred to as "zener breakdown" and the voltage it happens at the "zener voltage".
Low voltage zener diodes can still be used in the forward biased mode, like ordinary diodes. However most high voltage zener diodes have a "blocking diode" that is not documented on the data sheet to block forward biased operation. "Blocking diodes" are simply ordinary diodes wired in series with the zener; when the zener would be forward biased they are reverse biased (and thus blocking current), when the zener would be reverse biased they are forward biased.
What is the voltage gain of the FET amplifier?
It can be answered in two ways :
1. ratio of output & input voltages [Vout / Vin] i.e Drain voltage(Vds)/Source voltage(Vs).
2. multiplication of trans-conductance & drain resistance .
What is the different Rx level full and Rx level sub?
Rx level sub is the downlink level received when DTX (discontinous reception) is enabled. It is difference from Rx level full is that in full values are calculated when all the burst includin silent burst are considered but in sub values silent burst are ignored
What are the disadvantages of series capacitors in transmission lines?
The series capacitors can be the cause of overcompensating on the power line and thus cause the following problems:-
a) Over voltages on the line when connected loads are smaller than the rated loads and this can damage the transformers and capacitors
b) Ferro-resonace phenomenon can cause very high volatges again can be damaging
c) The fault level of the poweer system will increase and if not considered in the design, the fault current could exceed thedesign limits.
What is Op-Amp non inverting amplifier?
When the feedback of the output terminal of an Op-Amp is given to the non-inverting terminal [pin 3 for IC-741] of that Op-Amp , then , that circuit is called non-inverting amplifier using Op-Amp.
This circuit is called non-inverting because the output signal of this circuit is in phase with the input signal.
What would happen to a series circuit if another bulb was added?
A: Adding any resistance bulbs or whatever in a series circuit will reduce current and will reduce total power. In this case the bulb will glow dimmer as any additional bulbs are placed in the series circuit. this is true if the same input source is kept constant.
Why maximum forward current is important rating of a diode?
if you exceed the max forward current the depletion region will become too small and will no longer allow any voltage through. it will also cause the diode to begin breaking down and will result in the death of the component.
What will happen to the electric field when a dielectric is placed?
The electric field is weakened when a dielectric is inserted.
Does a kettle have a printed circuit board?
If the kettle is a new one, then it should. If it is an older style kettle with no automatic shutoff, then it will probably not.
How can an ammeter be connected in a circuit and not effect the flow of current?
The ammeter does affect the flow of current in a circuit, however, the resistance of the ammeter is so small in comparison to the circuit that the effect is negligible. It is connected in series.
How do you convert sr filp flop to jk filp flop?
An sr flip-flop can be converted into a jk flip-flop by changing the forbidden state in the sr flip-flop so that the out put toggles instead when the s=r=1.
What is the application of mux?
mux is used to select a single input out of various inputs.eg. there are 4 inputs and u want to selext the first then u mail use the select lines as 00 for the first input
01 for second
10 for third
11 for fourth
Why transistorised inverters are prefered over thyristerised inverters?
The transistor allows you to turn it off when you want, while the thyristor, or SCR, will not turn off until the anode-cathode voltage drops below the cutoff voltage.
How does the cut in voltage effects the output of a diode clipper?
For answering this question we have to consider the constant voltage drop model of the diode which says that if voltage across diode is less then its cut in voltage than assume diode to be open circuit and if it is greater then assume diode to be short circuit.
Till the input voltage is less than the cut in voltage, diode is open circuit(thus no current through the circuit). Thus entire input voltage appears across the diode as output.
When input voltage is greater than or equal to cut in voltage, then short circuit the diode. Thus, there will be no voltage drop across the diode as output.
Thus cut in voltage decides when to consider the diode open circuit and when short circuit. It decides when the diode will have output when it will not.
What is a profile plane in engineering graphics?
the plane which is perpendicular to both horizontal plane and vertical plane is called as "PROFILE PLANE"
Need of program Logic controllers?
Program logic controllers are used to control the operation of most systems.
Is Ohm's law states that voltage in a circuit is equal to resistance times current true or false?
True. Ohm's law states the voltage is resistance times current.
