30 Questions
What is the primary function of a diode in an electronic circuit?
To allow current to flow in one direction with greater ease
In a p-n junction, what is the characteristic of the p-region?
High concentration of holes and very few electrons
What is the purpose of applying an external voltage to a p-n junction diode?
To decrease the depletion layer's width
What is the effect of forward biasing on the depletion layer?
It decreases the depletion layer's width
What is the term for the process of applying an external voltage to a p-n junction semiconductor diode?
Biasing
What is the central region in a p-n junction where positive and negative ions accumulate?
Depletion layer
What happens to the width of the PN junction diode when it is reverse-biased?
It grows wider due to a lack of electrons and holes.
What is the function of an LED?
To emit light when an electric current flows through it.
What is the result of increasing the width of the depletion layer in a reverse-biased diode?
A high potential barrier is created.
What is the analogy of a diode's behavior?
A hydraulic check valve.
What is the state of a diode when it is forward-biased?
Closed
What happens to the electrons in the N-type material when a diode is reverse-biased?
They are attracted towards the positive electrode.
Why is silicon widely used in normal p-n junction diodes?
Because it is less sensitive to temperature and allows electric current efficiently
What is the primary function of a current limiting series resistor in an LED circuit?
To control the current flowing through the LED
What happens when an LED is connected in reverse direction?
It does not conduct and nothing happens
What is the primary difference between the construction of an LED and a normal p-n junction diode?
The materials used for construction
What is the relationship between the brightness of an LED and the current drawn by it?
The brightness of the LED increases as the current drawn increases
What type of energy is released when electrons and holes recombine in the PN Junction of an LED?
Light energy
What is the primary reason why silicon or germanium is not used for constructing LEDs?
They emit energy in the form of heat
Which type of LED is commonly used in small appliances such as remote controls and calculators?
MINIATURE LED
What is the primary advantage of using RGB LEDs in various applications?
They can produce almost any color output
What is the primary function of the aluminum/ceramic body in LIGHTING LEDs?
To provide heat dissipation
Which type of LED is particularly useful for photographers who need continuous lighting for shooting stills?
BI-COLOR LED
What is the primary difference between high power LEDs and traditional indicator LEDs?
Their levels of light output
What type of applications are high power LEDs typically used for?
Industrial facilities, sports venues, and outdoor environments
In which mode does a Zener diode allow a large amount of electric current and blocks only a small amount of electric current?
Forward-biased mode
What is the primary function of a Zener diode in electronic circuits?
To protect the circuit from over voltage
In a diode checking process, what is observed in a good diode when it is forward-biased?
Meter pointer shows low resistance
What is the name of the region in which a Zener diode is designed to operate?
Zener breakdown region
In what type of devices are high power LEDs also used?
Vehicle-mounted spotlights, portable torches, and flashlights
Test your knowledge of diodes, a two-terminal electronic component that allows current to flow in one direction with greater ease. Learn about the p-n junction, depletion layer, and more!
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