OPTO ELECTRONICS - Practice Mode

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

Cadmium sulfide Lead selenide Zinc sulfide Copper sulfide

Correct Answer: Lead selenide

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

Correct Answer: 0.2MA to 1.6MA

3) What is the type of transistor BPX81?

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

Correct Answer: NPN - Photo 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

Correct Answer: 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

Correct Answer: 2 V

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