0
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
VA stands for Volt-ampere. 1 VA is equal to 1 Watt. So 600va is about 600 watts. This can be confusing because a power supply rated at 600va will not put out 600 watts due to reactance. The power supply contains an inductor or capacitor so the actual output will be around 1/2 to 2/3 of the VA.
eight
How do you decrease resonant frequency of a series-tuned circuit?
To decrease the resonant frequency of any tuned circuit, increase the inductance and/or increase the capacitance.
What will happen when a machine run at low voltage?
The results of operating machinery at a reduced voltage depends on the type of machinery and the power supplies used in the equipment. In many cases, the current drawn will increase to allow a device to operate at a constant power. In others cases such as heating, thermostats will switch on heating elements for longer periods of time to achieve a required temperature. In some simple machines, motors will deliver less power because of the reduced voltage.
Although most equipment will operate at lower than rate voltages, there will be a voltage threshold below which it will not operate at all.
How do you control high voltage using SCR?
By giving proper gate triggering voltage... it can used to control the high power application like ordinary pn junction diode.
Why diode don't allow the current coming in opposite direction?
Diode is known as a rectifier because it only allows the current to flow in one direction. Diode is only effective when the input is AC.
What are the advantages and disadantages of Low Pass filter?
If the requirement is to pass low frequencies and block higher ones, it has every advantage and no disadvantages. For any other application it is useless.
Is a 74C926 the same IC as a MM74C926?
Got the answer my self off of a data sheet. Yes it is just no MM listed in Abra electronics web site confused me.
When a resistor is connected in parallel what happens to the size of current form the battery?
When a resistor is added the current goes down, that is expressed in the equation current= voltage/ resistance
1 For a parallel plate capacitor which is being charged out What the incorrect statement is?
Energy stored in the capacitor does not enter it through the connecting wire through the space around the wires and plates of capacitor.
How do you test a 6 wire motor for insulation grounds?
You use a device called a megger or meg ohm meter. Have the voltage range of the megger set to the working voltage of the motor. The first test should be to ground. One lead on the frame of the motor , the other lead one of the 6 wires. Test all 6 wires. If no ground shows up, test the individual coils against one another. If the coils are not grounded together, the motor is safe to energize.
yes
Explain working of delay lines circuit in cathode ray oscilloscope?
The delay line is used to delay the incoming signal vertical information and sync it with the horizontal. Old scopes used a series of LC combinations tuned to get a good waveform representation.
The HP scope I had used a very very long coil of coax cable as the delay line and got much better waveforms than the LC delay line scopes could, but the coil of coax was bulky (about a foot long by five inches wide and 1.5 inches thick).
What is a super heterodyne receiver?
A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.
When measuring current always place any type of meter in series with the circuit--is this true?
No. While it is true that one can measure current at any point in a circuit by breaking the circuit at that point and inserting the meter, not any meter will do it. One must use an ammeter to measure current.
How are Ac and DC different in terms of the flow of electrons?
With dc the electrons flow in one direction steadily, but in ac the electrons change directions 50 or 60 times every second. 50 in Europe, 60 in America.
Why normalization of message signal is necessary in conventional amplitude modulation?
to maintain the constant frequency and the phase parameters at the output
How do you identify a phase shift audio oscillator circuit?
hariram very poor boy and middle class family. i love pathmappriya.
Answer: less.
Answer: Kirchhoff's Current Law states that the sum of all currents into a junction (or out of a junction) must be zero. This refers to the algebraic some, that is, if you consider the current into the junction, any current entering the junction will be counted as positive, while any current leaving the junction will be counted as negative. Thus, any individual current will be equal to the negative of the sum of all the other branches at the junction.
How do you fix a cell phone screen that is broken from the inside?
cant get another phone srry :(
happened 2 me to
By Ohm's law, current is voltage divided by resistance.
In order to determine which circuit draws more current, you need to look at voltage and resistance. Assuming similar voltage, then, less resistance would result in more current.
Now you need to know the values of the resistors in both cases. You did not state those important pieces of information. The net resistance of two resistors, R1 and R2, in parallel is R1 time R2 divided by (R1 plus R2). All you need to do is calculate for the two cases.
If the two resistors were the same, you can generalize the answer by saying that, with contant voltage, two similar resistors in parallel will pull more current than one similar resistor - specifically, two will pull twice the current of one.
In a DC circuit is there an alternate to rheostat for controlling the battery voltage?
In a DC circuit, one alternate to the rheostat for controlling battery voltage is a voltage regulator. You could build a linear regulator, but you need to consider the power that might be dissipated - this would be the same amount of power dissipated by the rheostat. You could also build a switching regulator - this would be more complex, but it could be more efficient because the dissipation across the regulator would be less.
An isolation transformer has 500 turns on the primary winding how many turns are on the secondary?
An isolation transformer is intended to isolate the ground path in the primary from the secondary while maintaining the same voltage on the secondary. This means a turns ratio of 1 to 1. If there are 500 turns on the primary, then there will be 500 turns on the secondary.
