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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
How a Cathode Ray Oscilloscope is used to measure Alternating current?
An oscilloscope is, essentially, a voltmeter -it measures current by measuring the voltage drop caused by that current across a standard resistance.
Why digital multimeter fails to read low resistance values?
They read low resistance values very well. I measured several dead shorts today accurately with a digital voltmeter.
However, when attempting to measure LARGE amount of resistance, the current generator in a standard digital voltmeter may fail to effectively penetrate the medium being measured. It is for this reason that Meggers (Mega-Ohmmeters) are used to measure high amounts of resistance. They usually employ a hand crank to develop the current needed to effectively flow through the medium being measured.
Sometimes digital voltmeters can be very inaccurate if they are measuring something that matches the impedance of the meter (loading effects of the voltmeter), but that is another story.
What is interviewer induced bias?
Opinion or prejudice on the part of an interviewer, which is displayed during the interview process and thus affects the outcome of the interview. In research interviews, it is necessary that the interviewer conduct the interview with total objectivity, so that respondents are not influenced by any outside source in their responses. For this reason, interviews should be conducted by well-trained and qualified interviewers.
Need of frequency compensation in opamp?
Op amps have multistages. Each stage will contribute atleast a pole to the system. The effective effect of these poles will result in instability of system due to
What is the effective value of an AC sine wave current having a peak-to-peak value of 8 amperes?
The rms value of a sine wave current is 0.707 Imax. So the answer to your quesion is 0.707 x 4 = 2.83 A.
Why current is maximum in series resonance circuit?
Because the only opposition to current flow is the resistance of the circuit. This is because, at resonance, the vector sum of the inductive and capacitive reactances is zero.
Why rated voltage is to be applied to primary for open circuit test?
Open circuit test on a transformer is usually performed to measure the IRON losses.Iron losses are produced due to eddy current and hysteresis losses. In open circuit test, the LV side, generaly the secondary winding, is kept open and the HV side, generaly the primary winding is fed with the rated voltage and frequency. The rated voltage is applied in order to setup normal flux in the transformer, which in return further produces the normal iron losses at rated voltage. the wattmeter connected at the primary side will show the power consumed due to iron losses. this calculation further utilized for determing the efficiency of transformer.
Can a digital circuit produce the same output voltage for different input voltage values explain?
No, value of output voltage depends upon the value of input voltage and digital can not produce the same output voltage for different input values.
For example, suppose in a digital circuit two switches are connected. A closed switch is represented by 1 and an open one by 0. If there are two switches and we say that they are in state 1, then it would mean that both of them are closed. In this circuit after connection with the battery some current would pass so we call this current as output.Depending upon the states of the switches, the current either would pass or it would not pass.In case the current is passing, we can say the value of output is 1 and it is 0 when no current is passing. Whether the value of the output would be 1 or 0, it depends upon the values of input variables( 1 and 0) which specify the state of the switches.In this example, the switches form the input variable because the value of output depends upon the state of these variables which shows that digital circuit can not produce same output voltage for different values of input voltage.
What is the voltage power current and resistance of an electrical heater?
The two most important ratings for an electrical heater are its rated power and its rated voltage, and these will be printed on a 'nameplate' fixed somewhere on the heater (e.g. '3 kW at 230 V').
For the heater to operate at its rated power, it must be subject to its rated voltage. In the above example, the heater will only operate at 3 kW if it is supplied with 230 V.
If you know the heater's power (P) and its voltage (U), then you can calculate the rated current (I) it will draw from the supply, using the equation: I = P/U.
You can also determine its resistance (R), using the equation R = U2/P.
Transmission power cables are designed by current carrying capacity.
Why shunt resistance used in ammeter and why is it connected in parallel?
An ammeter's coil requires very little current for full-scale deflection (fsd). So, to measure a current above its fsd value, most of that current must be allowed to bypass the coil. This is achieved by placing a very low value shunt resistance in parallel with the coil ('shunt' is an archaic word for 'parallel').
What is the relation between load and resistance?
Ohm's Law:
Voltage = Current x Resistance
Current = Voltage / Resistance
Resistance = Voltage / Current
Ohm's Law can be used to tell you what the resistance of a circuit is if you happen to know what the voltage across the circuit, and the current through the circuit, happens to be. However, it must be remembered that resistance is notaffected by either voltage or by current. Resistance is only affected by the length, cross-sectional area, and resistivity of the conductor. As resistivity is affected by temperature then a change in temperature will likely result in a change of resistance. In general, the resistance of pure metal conductors increase with temperature, whereas the resistance of most insulators decrease with resistance. So, in the case of a pure metal conductor, if the current causes its temperature to rise, then its resistance will rise too -although this has absolutely nothing to do with Ohm's Law. A practical example of this effect is an incandescent lamp which has a relatively low 'cold' resistance, but a relatively high 'hot resistance'.
construction and working of semiconductor laser
What is the function of a commutator in DC generator?
All types of generators induce EMF in sinusoidal wave form. (A.C.) In a D.C. generator the function of a commutator is to convert A.C. EMF into D.C.
The commutator rectifies the output that is the alternating current so as to produce unidirectional alternating current (pulsating DC). This reverses the negative polarity current to a positive one so as the output is a pulsating DC.
An integrated circuit extractor is also known as a chip-puller. This tool helps to safely and quickly remove an integrated circuit from its socket without bending or damaging the pins. It is a tool commonly used in computer manufacturing and repair.
What is the criteria of Electronics companies?
The first Criteria of electronics companies is first class in BE & the person should have proper knowledge about the electronic circuits & Basic electronics fundamentals....(This is for an EC Engg only...)
Why are there not mufflers that reduce very high frequencies on ups trucks?
It is nasty that nups tries to market barking silencers when they marally should intall silencers on their brown trucks. FEDEX does.
