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Electronics Mechanic
OPTO ELECTRONICS
Set 2
Set 2
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Q4378
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Which material is used to make LDR for higher end requirements?
A
Cadmium sulfide
B
Lead selenide
C
Zinc sulfide
D
Copper sulfide
Q4379
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What is the range of photo current for photo transistor BPX 38?
A
0.1MA to 1.2MA
B
0.2MA to 1.6MA
C
0.3MA to 2.7MA
D
0.4MA to 3.8MA
Q4380
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What is the type of transistor BPX81?
A
Uni - Junction transistor
B
NPN - Photo transistor
C
PNP - Photo transistor
D
Audio frequency transistor
Q4381
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What is the function of opto-coupler in the switching operation of digital input signal?
A
Amplifier the signal
B
Converts voltage into current
C
Produces electrical noise signal
D
Defects the operation of switching signal
Q4382
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What is the forward voltage for the single colour orange LEDs?
A
0.5 V
B
0.8 V
C
2 V
D
2.5 V
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