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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 are the advantages and disadvantages of full wave center tapped?
A: There is no advantage since the result is the same DC. There is no power increase however the voltage DC will double since a bridge can rectify whatever comes out of the transformer as opposed to full pacification. The loss will be an additional .7v due to the fact that current will flow trough 2 diodes but then again the higher voltage will be there to more then compensate the additional .7 volts
What is represented by 'A' in 'OA79' diode?
The symbol 'A' indicates that this device is made from germanium . as you may know germanium has less cut in voltage so this device is used for low power signal or for signal processing. also the leakage current or reverse saturation current of germanium is greater than silicon.
What is it mean to say that an alternating current leads or lags an alternating emf?
It is another way of saying that the circuit is capacitive reactive circuit. Look up the mnemonic ELI the ICE man. ELI, voltage leads the current in an inductive circuit. ICE, current leads the voltage in a capacitive circuit.
Does transformers draw any current when secondary is open?
-Yes, the transformer draw current when secondary open. Because, the secondary of the
transformer is open, the primary draws only no-load current, which will have some copper loss.
Therefore, power is no longer transferred from primary to secondary in this approximation, and
negligible current goes through the secondary windings.Some current will flow through the primary as
well as secondary to magnetise the core to maintain the internet relaship between primary &secondary
winding as the winding consist of small resistance it is neglected practically hence the current will at at
no load also which is small in magnitude compared to the full load current.Thta is why we says that
transformer draws current when secondary is open.
What is the unit and abbreviation of current and resistance?
The unit of Current is Ampere. Abbreviation of Current is 'I' and that of Ampere is 'A'.
The unit of Resistance is ohm. Abbreviation of Resistance is 'R' and that of ohm is the symbol of 'omega' or the symbol of 'ohm'.
What does 14.65 ohms equal on the 20k setting. I got no reading on the lower settings?
The reading of 14.65 on the 20k setting means 14.65K Ohms, and you probably need to go back and re-read the instructions for the meter. If, for instance, you used a 2M scale, if you had one, you would get 0.014, but the result would not be very accurate, as you need to pick a range that is close to maximum reading for that range.
It is normal procedure to start with a high range and come down in range as you approach an on scale reading.
On navigation charts, you may find a feature marked on the chart as 'Radar conspicuous'. This means that the feature will show up clearly on radar and be identified as that part on the chart.
This not so obvious as it sounds. Land shows up on ship's radars, but due to reflections, absorption of radar signals and refraction, it can not always be certain to positively identify a coastline by it's shape.
Having something that stands out, because of it's shape and radar reflection, is useful for navigation purposes.
What is single polarity and double polarity of pulse amplitude modulation?
SINGLE POLARITY:
In single polarity PAM the height of the pulse is made larger than the maximum negetive value of the signla so that it remains positive even when the input is negetive
DOUBLE POLATRITY:
In double polarity PAM the pulse height is made proportional to the amplitude of the signal at the instant of the sampling
P.Nagarjuna
B-tech 3rd year, ECE,
Sri Indu college of engineering and technology
What is the purpose Sheath Voltage Limiter in high voltage Under groung cabling?
A sheath voltage limiter is an arrester that is used to clamp the voltage induced on the sheath of an underground high or medium voltage cable during a fault on the system. It is common practice when applying underground cable to only ground the cable sheath at one end of the cable, and leave the other end open. Leaving one ungrounded reduces circulating currents and losses during steady state operations. IEEE standard 575-1988 indicates that typically distribution arresters can be used for this function. IEC Application guide 60099-5 soon to be published offers a formula to use to determine the voltage rating of the arrester, but does not offer any guidance regarding the energy handling rating.
How capacitor is used to check freshness of fish?
Between the two plates of a capacitor lies a medium with a specific dielectric constant. Placing a fish between these plates changes to dielectric constant. If the fish is fresh it will be strong and tight, thus possessing a higher dielectric constant. If the fish is older, it's dielectric constant, or body, will be weaker due to decay.
What does channel-agnostic mean?
Probably it is computer or electronics talk for channel independent.
06/20/2013: Channel-agnostic - refers to retailers who are indifferent to which method you choose to shop or make returns. If you buy online can return in-store, vice versa.
Draw the constellation diagram of ASK with peak amplitude values of 1 and 3?
draw a diagram with amplitude 3 y 1
4.8 / (1.2 + R) = 3
4.8 = 3 (1.2 + R)
4.8 = 3.6 + 3R
1.2 = 3R
0.4 ohm = R
Are headphones an electronic device?
No it isn't.
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Technically speaking that is correct headphones are not electronic devices. They are a form of tranducer and therefore an electro-mechanical device.
What is Meaning of diode rating?
There are two diode ratings. One is the forward current rating, and the other is the reverse breakdown voltage rating. The forward current rating is the maximum current that the diode can conduct before failing, and the reverse breakdown voltage rating is the maximum reverse voltage that can be applied before failing.
Of course, the reverse voltage rating has a different meaning in a zener diode, but this answer applies to ordinary diodes.
Typical ratings for capacitors used for general electronics applications range from a few volts to 1 kV. As the voltage increases, the dielectric must be thicker, making high-voltagecapacitors larger per capacitance than thoserated for lower voltages.
What is the output of a diode can be?
A diode itself has no input or output.
The circuit containing the diode usually has an input and an output, maybe even more than one of each. The output of this circuit will depend on far more than the diode as well as depending on the type of diode used.
Theoretically: if a diode is connected across the secondary output of a stimulated transformer, you would read a half wave at the frequency of the source across diode.
Such a circuit would cause any real diode to explode due to lack of any current limiting and the resulting high power dissipation in the diode.
Hence "Theoretical". That's kind of what "Theoretical" means.
.The magnitude of the voltage and current of both the armature and shunt field coil.
To decrease the speed when the load is increasing then increase the shunt field current while decreasing the armature voltage or current.
To increase the speed while the load is increasing then increase the armature current while decreasing the shunt field current. The decreasing and increasing of these currents and voltages can be done by connecting a variable resistor in series or parallel with each of the armature and/or shunt field coil.
Will it still work when my radiator fins for CPU cooler are damaged?
That will depend on the degree of the damage to the fins.
If some of the fins are slightly bent there should be no problem at all.
On the other hand if several of the fins are broken off the cooling will probably not be adequate,
Is the microprocessor's internal temperature sensor reporting an unusually high temperature (this is the easiest way to tell if cooling is working right or not)?
If clock frequency is 5 MHz how much time is required to execute an instruction of 18 T states?
At a clock frequency of 5 MHz (10 MHz crystal) the 8085 has a clock period of 200 ns. An instruction using 18 cycles would use 3.6 us. (Microseconds)
This is for the case with no wait states. Each wait state adds 200 ns. Since an 18 cycle instruction has 5 memory accesses, one wait state per access would add 1 us to the execution time.
Hair dryers usually have a HIGH and a LOW setting. The HIGH heating element is about 8 ohms. The LOW heating element is about 32 ohms. voltage (squared) / resistance = power (watts) 120*120 / 8 = 1800 watts ( HIGH ) 120*120 / 32 = 450 watts ( LOW ) When the voltage switch is set to 240 volts, ALL it does is limit the HIGH/LOW switch to the LOW setting. 240*240 / 32 = 1800 watts ( LOW ) 240*240 / 8 = 7200 watts ( HIGH ) (the heating element would burn out)
How did the microchip change computers during the 1990s?
”be microchip made computer smaller; They could be used in more places.” -apex
