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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 can you build a model car to support a egg without breaking it?
Make the car out of a frame of popsicle sticks and the egg will not break.
What is a difference between motor and generator?
A generator uses the rotation of a coil of wire in a magnetic field to generate an electric current (also known as a dynamo), while a motor uses electricity flowing through a coil of wire placed at right angles to a magnetic field to produce rotation of the coil. Look up Fleming's left and right hand rules in a Physics textbook for further information.
Is discrete signal continuous?
To answer this properly more context is needed but frequency is in most contexts continuous.
What strenghthens a magentic field made by a current carrying wire?
Increasing the current along the wire.
What is the purpose of a coupling capacitor?
A coupling capacitor does the same work as its name suggests, that is coupling one stage of the electronic circuit with another. It does that without passing the DC bias voltages between stages so that these stages are not affected by each other.
To block or avoid the flow of D.C and to allow only A.C
How do you protect electronic devices from a EMP?
you cannot directally protect your device from an electro magnetic pulse however emps can only fire in a straight line so if you swerve your device away from the emp direct line of fire it will miss your device altogether =)
What is a sign of a short circuit?
A common sign of a short circuit is a blown fuse or a tripped breaker. Also visually seeing a burned wire and of course the smell of burned insulation all give an indication of a short circuit.
ICDP Stands For Iron Clad Double Pole. It is also known as Main Switch. It contain two fuse. One is for phase wire and another is for neutral wire.
What are the types of FET biasing circuit?
Various FET biasing circuits are as follows:
1. Fixed bias
2. Self bias
3. Potential divider bias
4. Current-Source bias
When there is a break on the circuit what is the reading?
The typical answer is current is zero when there is a break in the circuit. It depends on the complexity of the circuit, there may be other paths for the current to flow, such that if there is a break in one part of the circuit, the rest of the circuit still has current flow (but a different value than designed).
If you are reading voltage, and there is a break then that will change, also depending on the complexity. If it is a single loop, and you're reading voltage before the break, your voltmeter will read the same voltage as the voltage source, since there is no current flowing between any resistors between the meter and the source. If you're reading voltage after the break then the meter will read zero (0) volts.
What are the two main characteristics of a transistor?
- The ratio of the dc collector current (IC) to the dc base current (IB) is thedc beta (bDC).
- bDC is called the gainof a transistor:
bDC = IC/IB
- Typical values of bDC range from less than 20 to 200 or higher.
- bDC is usually designated as an equivalent hybrid (h)parameter:
hFE = bDC
- The ratio of the collector current (IC) to the dc emitter current (IE) is the dc alpha (aDC). This is a less-used parameter than beta.
aDC = IC/IE
- Typical values range from 0.95 to 0.99 or greater.
- aDC is always less than 1.
- This is because IC is always slightly less than IE by the amount of IB.
- From graph above we can see that there are 6 important parameters to be considered:
i) IB: dc base current.
ii) IE: dc emitter current.
iii) IC: dc collector current.
iv) VBE: dc voltage at base with respect to emitter.
v) VCB: dc voltage at collector with respect to base.
vi) VCE: dc voltage at collector with respect to emitter.
- VBB forward-biases the BE junction.
- VCC reverse-biases the BC junction.
- When the BE junction is forward biased, it is like a forward biased diode:
VBE ? 0.7 V
- But it can be as high as 0.9 V (and is dependent on current). We will use 0.7 V from now on.
- Emitter is at ground. Thus the voltage across RB is
VR(B) = VBB- VBE
- Also
VR(B) = IÂRRB
- Or:
IÂRRB = VBB- VBE
- Solving:
IB = (VBB- VBE)/RB
- Voltage at collector with respect to grounded emitter is:
VCE = VCC - VR(C)
- Since drop across RC is VR(C) = ICRC the voltage at the collector is also:
VCE = VCC - ICRC
- Where IC = bDCIB. Voltage across the reverse-biased collector-bias junction is
VCB = VCE - VBE
thank you
What is the key difference between old computers and the present day computers?
- vacuum tubes, large sized, high power dissipation, high voltages
- transistors, medium sized, medium power dissipation, low voltages
- integrated circuits, small size, medium power dissipation, low voltages
- microprocessors, very small size, low power dissipation, low voltages
What problems are encountered in digital transmission?
Disvantages:
1) It's very costly depending on the system used, the number of detectors purchased.
2) Time consuming
3) Lack of qualified professional
What is the effective radiated power formula?
EIRP (Dbm)= Output Power(Dbm)-Losses(from cables & adapters)+Antenna Gain(Db)
In a parallel circuit what is the total current equal to?
In all branches of a parallel circuit, it is voltage that is the same. Across each parallel branch of a circuit, we'll measure the same voltage. Probably the best example of equal voltages appearing across all branches of a parallel circuit is a household electrical distribution curcuit. The voltage at any outlet where you'd care to plug in an appliance or device will be the same. A fan plugged into an outlet in a bedroom will "feel" the same voltage as it would if it were in the living room and plugged into an outlet there.
One other way to look at things like this is that each branch of the parallel circuit is connected across the voltage source. Each branch could be looked at as an "independent" circuit, and any given branch doesn't care what is happening in any other branch. Does turning that fan we mentioned on and off, or even unplugging it from the outlet affect the operation of, say, the refrigerator? No, it does not. Any device plugged into an outlet is connected "directly" to the source of voltage. And each parallel branch of the circuit will operate independently of any other branch. We know that the voltage in (or across) any branch of a parallel circuit is the same as the voltage across any other branch.
The first statement is true, the motor needs a power source to operate.
How a Stepper motor is specified?
frequency range,Voltage,Physical dimentions ,Harse power Are the few - sridhar, 040380@gmail.com
When did the last circuit city store close?
Circuit city closed it's doors in early 2009. However, systemax Inc purchased circuit city in may, and reopened the circuitcity.com website. Check it out! Systemax also owns Tigerdirect USA, Tigerdirect Canada, Comp USA, Micro Europe, Global Computer, Info Tel USA, and Systemax PC.
What is cb configuration of the transistor?
A sexy transistor are two type. NPN and PNP..... c means common b means base .
WHAT IS the differences between analog and digital sensors?
Digital sensors produce digital output (0 or 1) which can be easy to communicate directly with a microcontroller. Analog sensors provide analog outputs which one must firstly digitize to sense the level. Analog sensors are generally more accurate.
What is the maximum reading in ohms for grounding purposes?
Generally lower earth resistance is preferable but for certain applications following earth resistance are satisfactory
Large Power Station s– 0.5 Ohm
Major Power Stations - 1.0 Ohm
Small Substation – 2.0 Ohm
In all Other Cases – 8.0 Ohm
