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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 do you determine the operating parameters of a diode over its full operating range?
Look at the "Diode Markings"
It is not true that when electric current flows through a long conductor each electron moves through a relative short distance because electric current is the continues flow of electrons.
What is meant by static and dynamic resistance?
static resistance: This is measured when diode id forward biased and input is a D.C signal. The ratio of voltage applied to the current flowing through diode gives static resistance
Dynamic resistance : this is measured when input is A.C signal. since A.C signal varies continuously the resistance offered also changes continuously. the ratio of change in voltage to change in current gives dynamic resistance.
Why A synchronous motor is sometimes called a synchronous capacitor Explain?
A synchronous motor can operate as either a Generator or a Motor.
When a synchronous motor has current applied to the windings on its rotor and the stator is energized with say a 50hz line supply (with little or no physical load) then the exact amount of excitation provided by the rotor can determine whether the stator displays inductive or capacitive properties.
If the rotor is under excited (too Little rotor current) the Synchronous Motor will behave as an Inductor, however if the rotor is over excited then the Synchronous Motor will behave like a Capacitor.
Hope this helps
Why common emitter configuration is mostly used for transistor as switch?
because in ce configuration value of input voltage requried to make the transistor on is very less value of the output voltage or output current
What is a protective resistor?
The protecting resistor is put in series with the LED so that you have a voltage divider - the supply voltage is split across the LED ( max 0.6v) and the remainder across the protecting resistor. So if your supply is 6volts, 5.4v will be across the resistor,
What are the functions of preset and clear in flip-flop?
A flip-flop is used to store state information.
- When a low is applied to the CLR input the flip-flop will be cleared.
- If a low is applied to the PR input, the flip-flop will be preset.
What potential difference is required to cause 4.00 A to flow through a resistance of 330 ohm?
Ohm's Law: Voltage = current times resistance
4 amperes times 330 ohms = 1320 volts
However, this represents a power of 5280 watts, and the resistor will get very, very hot. As a result, temperature coefficient will enter into the equation, and the resulting resistance will probably be higher than expected.
Will the value of joules constant be same if AC were used instead of DC?
Joules measure energy (power x time). If the AC voltage is expressed as rms (root mean square) and not peak, and there are no capacitors or inductors in the circuit, then the joules per second (=power ) will be the same.
When capacitors ate connected in series the capacitance increase or decrease?
Capacitors in connected in series result in a higher voltage rating, but lower capacitance. Two 470uF 50V capacitors connected in series will give you a total of 235uF, but you can put up to 100V across the series combination.
Two 470uF 50V capacitors connected in parallel will give you a total of 940uF, across which you can put 50V (the voltage rating does not change for capacitors in parallel).
What values must be on the Q's of the flip flops to cause the counter to reset?
In a "normal" binary counter, connected the "normal" way, it will reset when all of the Q's are 1.
Capacitors in series are like resistors in parallel, the total capacitance is the inverse of the sum of the inverses.
CSERIES = 1 / Summation1toN (1 / CN)
For this question ...
1 / 12 = 1 / 30 + 1 / x
1 / 12 - 1 / 30 = 1 / x
0.05 = 1 / x
x = 20
How is positive lead on an electrolytic capacitor identified?
Normally all electrolytic capacitors negative lead is marked on the side and if the plastic cover came off and it is new the long lead is the positive.
How do you find power input with given power factor and power output?
Output Power divided by Power Factor.
What is the equivalent resistance of a pair of 8 ohm resistors in series circuit?
Two eight-ohm resistors in series would have a total resistance of 16 ohms.
Two eight-ohm resistors in parallel would have a total resistance of four ohms.
What is the simplest way to visualize a diode?
The simplest way is the Ideal Model representation of a diode.
Forward: V=0(short circuit),r'd=0,I=use Ohm's law.
Reverse: V=Vbias(Open Circuit),I=0,r'R=0.
Ideal model means it is acting as a switch.
How much current flows through a circuit if the resitance is 4 ohms and there is a12 volt battery?
3 Ampere
What is a quasi stable state in multivibrators?
Every multivibrators have two states:quasi stable and stable state.
quasi stable state are triggered state, when a trigger pulse is given the vibrator reaches this state.
For example,
Astable multivibrators have no triggers so,two stable states.
Monostable multivibrators have one trigger so,one stable and one quasi stable which is invoked by the trigger.Same for the Bistable in which two sates are invoked by two triggers.
What are the Characteristics of Direct and indirect band gap semiconductors?
Direct band semconductors are mostly for LEDs. Indirect band semiconductors like Si and Ge are conventional diodes.
Can radar detect stealth helicopter?
No world is a stage, and you cannot detect a helicopter unless you have the radar station (radar alone is not sufficient)
What is the function of sbuf register in 8051?
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What is the symbol and unit of measurement of current intensity?
the symbol of current density is 'J'.
& its unit is (Amp/m^2)
What happens to the magnetic field if the current in the wire increases?
If the current in the wire increases, the magnetic field also increases.
What does PN stands for in 250PN 16 uPVC?
250 nominal diameter, withstands of 16 bar pressure UPVC pipe,
How does negative feedback stabilize gain?
Output of an Amplifier is given back to same Amplifiers input in out of phase. act as subtracter. if amplifiers output excess the some portion is given back to input and it reduces the original input. this makes original signal so small so that gives desired output. its of course close loop so by this manner this negative feedback stabilizes gain.
