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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
Can fast blow fuse used in place of slow blow fuse?
No. A slow blow fuse is intended to survive a short overload from the startup of a piece of equipment, usually a motor or power supply. If you use a fast blow fuse in this application, it will tend to blow unexpectedly.
Motors usually pull four times their rated running current on startup, but only for a very short period of time. The slow blow fuse, or slow trip circuit breaker, is designed to handle this. Similarly, power supplies need to charge the primary filter capacitor from zero voltage in one line cycle on startup. Worst case is turning on the power switch at the peak of the line cycle. Inductance of the transformer (if present) and dynamic resistance of the diode mitigates this, but there is still a larger than normal current transient. Again, the slow blow protective device allows this in the short term.
Hy i'm GbRlEuEeN, i used f10a(fast) fuse to replace t5a fuse(slow) but was on audio sistem(subwoofer) and i will change back as soon il get the t5a. ( i tryed f5a first but blowed instant at power up.
The watt is a measurement of power. In electrical circuit, to determined watts there is a formula volts x amps = watts
What property of a diode enables it to convert ac to dc?
A diode allows electrons to pass only in one direction. During the negative half cycle of an alternating current the diode will not allow electron current to pass. It is like a one way valve. This property of diode enables it to convert AC into pulsated DC
How many minimum number of nand gates are required to realize xor gates?
As such an OR gate should do the job...but if the question is of using gates other than the simple OR, it should be a combo of NOR and NOT gates; where-in, the NOT gate comes after the NOR gate.
Factfully speaking:
The output of a NOR gate when fed to a NOT gate shall give you an OR gate.
cheers :)
Anish Murthy Airpula,
RF Design Engineer (F.A.E)
Ceramic & Microwave Products Group,
Dover Corporation Inc,
United States of America
How much money does an electronic engineer in South Africa earn?
Civil engineers in South Africa make from R176,552 to R590,304. This is equal to $16,080 to $53,750 in US dollars. The income for this job is strongly based on experience.
What is the difference between a conductor and an insulator in terms of electrons?
Electrons are part of an atom, in elements etc.
Electrodes are types of medical equipment places on certain parts of your body, that send electrical pulses to your muscles to stimulate them.
Why 120 degree phase shift is maintained for 3-phase systems?
There are 360 degrees in a full cycle so 120 is one-third so each of the three phases is equally spaced delivering power evenly to the load.
What is current density of copper busbar for 4000A?
The current density for a copper busbar will vary as the size of the bar. And no, that's not a trick answer. More information about the application is needed to determine what size the busbar is, since only the ampacity was cited here. There are different specifications (sizes) for busbars, as you know. The deal is that there is usually a "temperature rise" factor that delimits what you're supposed to use. Higher temps mandate bigger bars, which you probably already figured out. The basic busbar size is set on how much heat the busbar will generate when conducting it maximun rated current. But factors regarding the thermal environment in which the unit is operating must be considered. Minimum size for 4000A is probably 1/4 x 10, but some applications will require up to 3/4 x 10 with some allowing something in between. With a specified size bar, you can easily calculate the current density by dividing the current (4000A) by the cross-sectional area. Pick one and go for it.
I am about to take this exam myself, so maybe I can help both of us with this.
The choices are:
A.) anode
B.) cathode
C.) deflecting plates
D.) grid
The answer starts on page 86 of your study guide, titled "Cathode Ray Tubes".
In this illustration, current supplied to the heater causes emission of electrons from the cathode. Those electrons pass toward the anodes through an opening in the control grid. The grid limits the number of electrons that can pass through it, and the anodes cause the electrons passing the grid to a point on the fluorescent screen. Also, two deflecting plates are placed in the path of the beam electrons. When a voltage is applied to these plates, the beam is deflected toward the positively charged plates. If the applied voltage is alternating, the beam moves up and down through its normal central position, and the luminous spot moves on the screen in the same way.
Based on this information I have deduced thus...
The answer is not A.) anode. Because the anodes job is to pass the electrons the grid allowed through to the point on the fluorescent screen.
The answer is not B.) cathode. Because the cathode when heated causes emission of electrons, its purpose is not to limit the number of electrons, just to produce the electrons. The answer is not C.) deflecting plates. Because their job is to use the emitted electrons allowed through the grid to make the projection. So, the answer must be D.) Grid. Because the grid limits the number of electrons that can pass through it!
Like I said, I have not taken this exam myself. However, based on the reading material, D just makes sense!
What is the difference between digital and analog voltage?
Analogue scales use mechanical components such as springs or levers to determine weight and display their measurements with a moving dial or with graduated beams and sliding weights (poises).
Digital scales use an electronic load sensor such as a load cell to determine weight and convert this to a digital signal to be displayed on an LCD or LED.
Notice that this is not the same as digital vs analog when it comes to electrical circuits. Scales which use electrical power to function, but are not digital (no microprocessors) are simply called Electronic Scales, not Analog Scales. The term Analog Scale in the industry typically refers to mechanical scales.
Digital and electronic scales are more common these days as their price to performance ratio has greatly improved. They are also much easier to use than older analog scales. Accuracy is not a matter of analog or digital and both can be accurate or inaccurate depending on several factors just like a digital and an analog wrist watch can both have the wrong time. Generally speaking though, digital scales offer much finer display resolution.
Why the common mode signal should be rejected in differential amplifier?
because of the coupling between the two transister and absence of capacitance it can amplify both dc and ac
For capacitors connected in parallel the total capacitance is the sum of all the individual capacitances. The total capacitance of the circuit may by calculated using the formula:
where all capacitances are in the same units.
How a transistor acts as an amplifier?
A transistor has three sections, an emitter, base, and collector. By extracting a small number of electrons from the base, a large # of electrons can flow across the transistor from the emitter, thru the circuit, and back to the collector.
They are resistance connected in parallel with high voltage power supply for the purpose of discharging the energy stored in filter capacitance when the equipment is turned off.
How much do wind turbines cost in pounds?
The cost of solar panels and solar systems vary a great deal based on the size and usage of the panels and the size of the system installed. Based on what solar experts call the average home system, one could expect to spend around 6,000 pounds.
How to find polarity of TRAN SISTOR using multimeter?
A: The most basic way is to measure base to emitter front to back resistance, and base to collector as well There should be a high ratio of front (forward bias) to back (reverse bias) resistance, indicating that the junction has function. Most transistors that failafter operation will be short, or open in the BE, BC, or EC junction.
Most multimeters today have a diode test function- use it, and listen for beep, no beep instead of looking at front to back resistance, particularly auto ranging meters. A transistor is two diode where the base is connected to both. first step is finding out if NPN or PNP then connect one lead from base to emitter, then to the collector finally emitter to collector. I might point out that some meters have 9v battery that can harm the junctions during checking. Finally it will tell you good or bad but it will never tell you how good or how bad.
What are the disadvantages of using common emitter amplifier?
Disadvantages of CE amplifier:
- 1. It has a high output resistance.
- 2. It responds poorly to high frequencies.
- 3. It has high thermal instabilities.
- 4. It's voltage gain is very unstable.
How Frequency Modulation Have Higher Bandwidth then AM?
Bandwidth is defined as difference between two frequencies.
In AM only amplitude is modulated or changed to transmit the data at the given fixed frequency. In FM the frequency of the signal is changed to transmit the data. Since we will need a range of frequency to transmit the data using FM (say frequencies from f1 to f2), the bandwidth of FM signal will be higher than AM signal which can transmit at a fixed frequency.
But.....
The above answer does not address the issue of "strength of modulation", that is, modulation index.
A.M. will always have a bandwidth of twice its highest modulating frequency regardless of the strength of modulation.
For voice comms with about a 3 kHz maximum frequency, A.M. will demand (3+3) = 6 kHz of bandwidth.
Because F.M. modulates the frequency swing of the transmitter, low modulation indexes with F.M. can give a bandwidth LESS than the maximum modulating frequency. Narrow-Band F.M. (NBFM) can have a bandwidth of *less than* 3 kHz, indeed it can have a bandwidth of only a few hundred hertz, in theory.
In practice, very narrow NBFM suffers from worsening signal-to-noise ratios, and one of F.M.'s chief advantages over A.M. is the superior signal-to-noise of F.M. when it is allowed sufficient bandwidth.
While it is true that an inductor opposes the flow of an alternating current, it does not necessarily 'block it'. The quantity that opposes the flow of an AC current is the inductor's inductive reactance, expressed in ohms. Inductive reactance is proportional to the frequency of the supply voltage and, at 50 or 60 Hz, the reactance of a transformer's winding is relatively low (although very much higher than its resistance) and, while this acts to limit the amount of current flow, it certainly doesn't act to block that flow.
How does a switch control an electric device?
A switch basically represents a gap in the electric circuit. Electric current can pass through a circuit only if it is complete. An incomplete circuit can never pass a current through it.
When the switch is in the 'off' position, the circuit has a break (gap) in it.
When you put the switch in 'on' position, the circuit wire join and the circuit gets completed.
What is the difference between a conductive and resistive load?
A resistor is used to represent any one of many different components, called loads, that convert electrical energy to other forms of energy. For example, motors, toasters, lamps, radios, televisions, microwave ovens, and electric kettles convert electrical energy to motion, heat, sound, and light.
