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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 is the difference between in ac and dc powwer cable?
There is no difference in the cables. The only difference is the type of electrical power being transmitted. AC or DC applications use the same wires.
Phase modultion is one of the three ways of modulating or altering a signal so that it is able to carry information. The other two are amplitude and frequency modulation. Phase modulation is used in high speed modems.
Thomas Young, a Quaker medical doctor is credited with the invention of the Ripple Tank, still used today in colleges and high schools to demonstrate the basic principles of the wave. The design was simple and has become a classic teaching tool.
Differentiate in between conductor and semiconductor and insulators using band diagram?
Conductor-one which conducts(allow current)electric city in all condition.
Semiconductor-One which behaves like conductor as well as insulator depending on condition.
Insulator-one which donot conduct(allow current)electric city in all condition
What wattage will be generated if you apply 100 volts to a resistance of 50 ohms?
The formula you are looking for is I = W/E.
What is the difference between a one diode rectifier and a two diode rectifier?
A one diode rectifier is called a half wave rectifier and only allows current flow for the positive portion of the sine wave. A two diode rectifier, or full wave rectifier allows positive current flow during the positive portion of the wave as well as positive current flow during the negative portion of the sine wave. This results in a much cleaner DC power signal. The addition of a capacitor in the output circuit will clean up the signal very nicely.
What occur if n type material is joint with p type material?
When an n-type semiconductor is further doped with pentavalent atom, four of the atoms are tiedly bond through the process of covalent bond and one electron is weakly bound and free to move as the temperature rises.
What happens when one of three diode is removed from 3 phase full wave rectifier?
A: Then the phase that the diode is remove will not work or Rather get an output
What is the formula for total current in a series circuit?
Current = (Voltage across the circuit) divided by (Total resistance of the circuit).
The current is the same at every point in the series circuit.
Difference between ac dynamo and dc dynamo?
1. AC Dynamo has full rings whereas DC Dynamo has split rings.
2. AC Dynamo produces alternating current whereas DC Dynamo produces direct current.
3. IN AC DYNAMO, CURRENT KEEPS CHANGING EVERY HALF OF A CYCLE WHEREAS IN DC DYNAMO, CURRENT FLOWS IN SAME DIRECTION.
How to convert 100ampere to kva?
Divide by your number of phases 1 or 3 then divide by your Voltage. If its a 3 phase supply Voltage you need to divide by your 3 phase voltage for balanced loads and by your single phase voltage for unbalanced loads requiring a neutral.
How do you work out the secondary voltage in a transformer?
The voltage ratio is the same as the turns ratio for an ideal transformer, and most transformers are close to being ideal. So use the following equation:
Vs/Vp = Ns/Np
No.
Radar use electromagnetic radiation of a much longer wavelength
How can I program 4 x 16 decoder in VHDL?
1st - 2:4 decoder using "enable" :
entity DECODER is
port (A, B, Enable : in std_logic ;
Out : out std_logic_vector(3 downto 0)
);
end DECODER;
architecture ARC.DECODER of DECODER is
begin
Out(0) <= Enable or (not A nand not B);
Out(1) <= Enable or (A nand not B);
Out(2) <= Enable or (not A nand B);
Out(3) <= Enable or (A nand B);
end ARC.DECODER;
2nd - 2:4 decoder using "select" and "with" (case) :
entity DECODER is
port ( SEL : in std_logic_vector(1 downto 0);
outlet : out std_logic_vector(3 downto 0)
);
end DECODER;
architecture ARC.DECODER of DECODER is
begin
with SEL select
outlet <= "0001" when "00",
"0010" when "01",
"0100" when "10",
"1000" when "11",
"0000" when others;
end ARC.DECODER;
3rd - 2:4 decoder using "signal", "component" and "map" :
entity DECODER is
Port (A,B : in STD_LOGIC ;
F0,F1,F2,F3 : out STD_LOGIC );
end entity DECODER;
architecture ARC.DECODER of DECODER is
signal A_sig, B_sig : STD_LOGIC;
component INV
port (In1 : in STD_LOGIC ;
Out1 : out STD_LOGIC );
end component;
component AND_2
port (In1, In2 : in STD_LOGIC ;
Out1 : out STD_LOGIC );
end component;
begin
U1 : INV port map (A, A_sig);
U2 : INV port map (B, B_sig);
U3 : AND2 port map (A_sig, B_sig, F0);
U4 : AND2 port map (A, B_sig, F1);
U5 : AND2 port map (A_sig, B, F2);
U6 : AND2 port map (A, B, F3);
end architecture ARC.DECODER;
How does the avr automatically maintain a constant voltage level in a generator?
The AVR (automatic voltage regulator) measures the generator voltage output and varies the field voltage (which varies the strength of the rotating magnetic field) to maintain a fixed output voltage.
Some generators excite (power) the AVR and field windings from the main stator, some provide a separate stator winding just for field excitation, and others provide a separate stator winding and rotating permanent magnets (called PMG) for field excitation.
The generators that do not have permanent magnets rely on residual magnetism for the initial voltage to start the system or may provide initial voltage from the engine's starting battery.
What the function of input rectifier at the digital multimeter?
The indicater meter is a DC device, so the rectifier changes AC to DC.
A meter could not respond to AC.
Name the charge responsible for current flow?
it is electron because there are free electrons in a conductor .The atoms are fixed on their places.The positive ion (as a result of emission of an electron which is negatively charged ) remains still on its place and hence the free electrons are responsible for the current flow . In solutions and gases the positive ions can also move because they are free to move unlike in the metal
What is the modulation of frequency?
It is a device or electronic circuit that changes the frequency of an oscillator according to the amplitude of modulating signal. For instance, if the modulation is linear, the modulator changes the frequency proportional to the amplitude of the modulating voltage.
Is a voltmeter placed parallel to a circuit?
Depends. What did you want to measure? If it's voltage drop across the incandescent element, then you had better hook up your infinite resistance voltmeter in parallel with the lamp.
How do transistors amplify weak signal?
A transistor controls the flow of current between the emitter and collector.
The larger current is supplied by the power supply, across the emitter and collector.
The flow is then controlled by a small current applied to the base connection.
So, a large current flow mimics the small signal current.
Limits are reached, when the transistor gets close to being fully switched on or off. This will cause distortion. To avoid this, more amplification is provided by a series of transistor amplifiers, one after the other.
Avoiding Bias in Assessment Tasks and Procedures?
It is important that educators do not show bias on assessments. The teachers must be knowledgeable about the culture of their students so that they do not offend students with certain test questions.
Latest technology in electronics and communication?
latest technology in communication slide should be 4G and 6th sense technology.
