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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 component is under the fan and heat sink?

A central processing unit (CPU), is under the fan and heat sink. The processor creates a lot of heat as it works, and would soon burn-out if not cooled.

What value of power is dissipated by a 5 k ohm resistor when 30 mA flows through it?

first need to find the voltage value to calculate the Power Dissipation. Because

P= I*V

Here V = IR

in given value

I = 30 m A = 0.03 A

R= 5 K Ohm = 5000

V= 0.03*5000=150

V= 150 V

Power dissipation

p= 150*0.03=4.5 Watt

What is mean by PCB board?

Printed Circuit Board, the circuits/wiring are printed in copper traces on an insulating board.

Does a refrigerator have transistors?

A fridge may or may not have a few transistors in it, these are electrical components that would probably be part of the control circuitry. Transistors used to be very common components of most electrical appliances.

The cooling process of the fridge has nothing to do with transistors and is handled by a compressor and a heat exchange pump

Why master slave jk flip flop is preferred over jk flip flop?

A plain JK flipflop is unreliable as it is enabled by the level of the clock, not the edge. In a master-slave flipflop, the master section captures the new state based on the inputs while the clock level is high, then the slave section captures the new state from the master while the clock level is low. This has the effect of making the flipflop act as if it was falling edge clocked but retains the simplicity of design of flipflops that are level enabled.

What does a disc capacitor do?

A disc capacitor does exactly the same thing that any other capacitor does, with one difference: it has the lowest value of parasitic inductance of any type of capacitor. As inductance is exactly the opposite property to capacitance, its presence in a capacitor is very undesirable in many applications and can sometimes result in circuit instability.

What end of a diode has the band marking?

if a diode has color band markings they are on the cathode end

How much voltage appears across a zener diode when it is forward-biased?

That depends on the zener voltage rating:

  • "low voltage" zeners are just a simple single diode, the zener diode
  • "high voltage" zeners contain 2 back to back diodes in one package, the zener diode and an ordinary diode that is reverse biased when the zener diode is forward biased to block forward conduction of the zener and protect it from overcurrent damage if installed backwards by mistake

Thus in "low voltage" zeners when forward biased they will have a normal diode drop (e.g. 0.7V), but "high voltage" zeners when "forward biased" they will act open due to the reverse biased blocking/protection diode in series with the zener.

Can a defective diode be repaired and reused?

This is not really practical and the cost to repair (if it could be done) would be about 2 orders of magnitude larger than a new replacement diode costs.

What is the purpose of a digital converter?

A digital converter converts the analog signals that are received by your TV to digital signals. Most TV providers only offer digital TV these days, so you only need it if you're still using analog.

How shunt helps to extend the range of ammeter?

A shunt is connected in parallel with an ammeter.

Any current applied to parallel devices will divide betwen them, so the ammeter will pass only a part of the total current.

What will happen if current is more than required in diode?

If the applied voltage is greater than maximum forward voltage, the diode will get damaged..

How much current would an applied voltage of 10 volts cause through a resistance of 5 ohms?

10 volts applied to 5 ohms would cause a current flow of 2 amperes.

Current = voltage divided by resistance.

Who is more gain amplifier cascaded amplifier or darlington amplifier?

Darlington amplifier has more gain when compared to cascade amplifier .

What electrical devices do you know?

Transformer

Motors

CT,PT

Genrators

these all are electrical devices

What is shunt and series motor?

A series motor is one in which the field windings are in series with the armature windings. So the torque is proportional to the square of the supply current.

'Shunt' is an archaic term for 'parallel'. So a shunt motor is one in which the field winding is in parallel with the armature windings. So the torque is proportional to the supply current.

Which of the following are criteria that define a transmission method as a spread spectrum technique?

The transmitting signal bandwidth is much wider than would normally be necessary to transmit the information

Some influence other than the information being transmitted is used to determine the transmitting bandwidth

What is the significance of dc load line in a transistor?

A load line is used in graphic analysis of circuits, having both linear and non-linear parts, representing the constraint the other parts of the circuit put on the non-linear transistor. It represents the response of the linear circuit connected to the transistor. The DC load line describes the DC operation of a transistor graphically.