Light Emitting Diode

Zener diode works as _______________ .

• doubler

• voltage regulator

• amplifier

• oscillator

In __________________ region zener act as voltage regulator.

• forward bias

• neutral

• reverse break down region

full form of LED

• light emitting diode

• light limiting diode

• light storing diode

• light electrification diode

led works only in ______ bias

• Forward

• Reverse

The colour of emitted light from LED depends on

• physical dimensions of LED

• Number of available carriers

• Type of semiconductor material used

• Number of recombinations taking place

The advantage of LED is

• Low operating voltage

• Long Life

• Small in Size

• All the above

When forward biased, LED emits light because of

• Recombination of carriers

• Light generated in breaking the covalent bonds

• Light produced by collisions

• None of the above

The LEDs made with GaAs emit light in the

• Yellow region

• Infrared region

• Orange region

• Red visible region

The LEDs made with SiC emit light in the

• Yellow

• Orange

• Amber

• Blue

The LEDs made with GaAsP emit light in the

• Red

• Yellow

• Green

• White