OPTO ELECTRONICS - Quiz

1) Which material is used to make LDR for higher end requirements?

Cadmium sulfide Lead selenide Zinc sulfide Copper sulfide

2) What is the range of photo current for photo transistor BPX 38?

0.1MA to 1.2MA 0.2MA to 1.6MA 0.3MA to 2.7MA 0.4MA to 3.8MA

3) What is the type of transistor BPX81?

Uni - Junction transistor NPN - Photo transistor PNP - Photo transistor Audio frequency transistor

4) What is the function of opto-coupler in the switching operation of digital input signal?

Amplifier the signal Converts voltage into current Produces electrical noise signal Defects the operation of switching signal

5) What is the forward voltage for the single colour orange LEDs?

0.5 V 0.8 V 2 V 2.5 V