Light Emitting Diode and Optical Isolation MCQ’s

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This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on “Light Emitting Diode and Optical Isolation”.

1. Who was/were awarded with noble prize in physics in the year 2014 for the invention of blue light emitting diodes?
a) Hiroshi Amano
b) Nick Holonyak
c) Isamu Akasaki, Hiroshi Amano
d) Isamu Akasaki, Hiroshi Amano and Shuji Nakamura

2. Which alloy is used for green blue and white LED’s?
a) InGaN (Indium gallium nitride)
b) GaAs (Gallium arsenide)
c) (AlGaInP) Aluminum gallium indium phosphide
d) TiO2(titanium dioxide)

3. Who developed the first Light emitting diode?
a) Nick brown
b) Nick Holonyak
c) Stefencolumbus
d) Billy Stern

4. Which alloy is used for red, orange and yellow LED’s?
a) InGaN (Indium gallium nitride)
b) GaAs (Gallium arsenide)
c) (AlGaInP) Aluminum gallium indium phosphide
d) TiO2(titanium dioxide)

5. Opto-isolator uses a source of light for transmission, most commonly “near infrared light emitting diodes”.
a) True
b) False

6. Which is a type of Opto-isolator?
a) CMCP793V-500
b) MOC3021
c) MPU 6050
d) L298N

7. Recombination of charge carriers in an LED, releases some energy which comes out in the form of light.
a) True
b) False

8. LASER stands for ____
a) Light amplification by systematic emission of radiation
b) Light amplification by stimulated emission of radiation
c) Light absorption by stimulated emission of radiation
d) Low amplification by stimulating emitted radiation

9. Optical isolator is also called as ________
a) Opaque isolator
b) Optical coupling
c) Optocoupler
d) Optical resistor

10. Who is known as the father of fibre optics?
a) Nick brown
b) Nick Holonyak
c) Stefencolumbus
d) Narinder Singh Kapany

11. Which layer is just present above cladding that protects the optical fibre from physical damage?
a) Core
b) Cladding
c) Coating
d) Cover

12. Which electromagnetic rays is emitted GaAs LED’s ?
a) Infrared
b) Visible light
c) Ultraviolet
d) Radio

13. Which layer is just present above core that protects the light from going outside?
a) Core
b) Cladding
c) Coating
d) Mine

14. What is the working principle of optical fiber?
a) Total internal refraction
b) Total internal reflection
c) Lenz Law
d) Brine theory

15. The critical angle in total internal reflection depends on the colour of the incident light.
a) True
b) False

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